DTC Set Conditions: Diagnosis

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V. C. I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
MB991223: Harness Set
MB992006: Extra Fine Probe
MB992110: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check the data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  
  Fig 1: Connecting Special Tool MB991910 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 75: Cancel switch.
    - When "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 86: Main switch.
    - When "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
  - Item 91: Resume switch.
    - When "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 92: Set switch.
    - When "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 20.

NO : Go to Step 2.
STEP 2. Measure the power supply voltage at cruise control switch connector C-201 by backprobing.
1. With the harness connector, remove the cruise control switch (Refer to REMOVAL AND INSTALLATION ).
2. Connect the negative (-) battery cable.
3. Do not disconnect cruise control switch connector C-201.
4. Turn the ignition switch to the "ON" position.
5. Do not operate the cruise control switch.
6. Measure the power supply voltage between cruise control switch connector C-201 terminal number 3 and ground by backprobing.
  
  Fig 2: Measuring Power Supply Voltage Between Cruise Control Switch Connector C-201 Terminal Number 3 Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.7 and 5.0 volts?

YES : Go to Step 10.

NO : Go to Step 3.
STEP 3. Measure the power supply voltage at ECM connector B-10.
1. Remove the ECM [Refer to ENGINE CONTROL MODULE (ECM) ].
2. Connect special tool MB992110 between the ECM and the body-side harness connector.
3. Turn the ignition switch to the "ON" position.
4. Do not operate the cruise control switch.
5. Measure the power supply voltage between special tool 48-pin connector terminal number 107 (ECM connector B-10 terminal number 107) and ground.
  
  Fig 4: Measuring Power Supply Voltage Between Special Tool 48-Pin Connector Terminal Number 107 Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect special tool MB992110 between the ECM and the body-side harness connector.
8. Install the ECM [Refer to ENGINE CONTROL MODULE (ECM) ].
Q: Is the measured voltage between 4.7 and 5.0 volts?

YES : Go to Step 6.

NO : Go to Step 4.
STEP 4. Check ECM connector B-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connector and terminals in good condition?

YES : Go to Step 5.

NO : Repair or replace the faulty connector. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 5. Check the harness for short circuit to ground between the ECM connector B-10 terminal number 107 and the cruise control switch connector C-201 terminal number 3.
1. Disconnect ECM connector B-10 and measure at the harness connector side.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Measure the continuity between ECM connector B-10 terminal number 107 and ground.
  
  Fig 5: Measuring Continuity Between ECM Connector B-10 Terminal Number 107 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. Reconnect ECM connector B-10.
Q: Is the measured continuity open circuit?

YES : Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 19.

NO : Go to Step 6.
STEP 6. Check intermediate connector C-130, cruise control switch connector C-201 and clock spring connectors C-202 and C-205 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connectors and terminals in good condition?

YES : Go to Step 7.

NO : Repair or replace the faulty connector. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 7. Check the harness wire between ECM connector B-10 terminal number 107 and cruise control switch connector C-201 terminal number 3 for damage.
Q: Is the harness wires in good condition?

YES : Go to Step 8.

NO : Repair the damaged harness wire. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 8. Check the clock spring.
Refer to DRIVER'S AIR BAG MODULE INSPECTION .

Q: Is the clock spring in good condition?

YES : Go to Step 9.

NO : Replace the clock spring (Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING ). Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 9. Using scan tool MB991958, check data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 75: Cancel switch.
    - When "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 86: Main switch.
    - When "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
  - Item 91: Resume switch.
    - When "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 92: Set switch.
    - When "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ). Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ).

NO : Return to Step 2.
STEP 10. Measure the ground voltage at cruise control switch connector C-201 by backprobing.
1. Do not disconnect cruise control switch connector C-201.
2. Turn the ignition switch to the "ON" position.
3. Press the "ON/OFF" switch.
4. Measure the ground voltage between cruise control switch connector C-201 terminal number 2 and ground by backprobing.
  
  Fig 6: Measuring Ground Voltage Between Cruise Control Switch Connector C-201 Terminal Number 2 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. Release the "ON/OFF" switch.
6. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.52 volt or less?

YES : Go to Step 17.

NO : Go to Step 11.
STEP 11. Measure the ground voltage at ECM connector B-10.
1. Remove the ECM [Refer to ENGINE CONTROL MODULE (ECM) ].
2. Connect special tool MB992110 between the ECM and the body-side harness connector.
3. Turn the ignition switch to the "ON" position.
4. Press the "ON/OFF" switch.
5. Measure the ground voltage between special tool 48-pin connector terminal number 95 (ECM connector B-10 terminal number 95) and ground.
  
  Fig 7: Measuring Ground Voltage Between Special Tool 48-Pin Connector Terminal Number 95 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. Release the "ON/OFF" switch.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Disconnect special tool MB992110 between the ECM and the body-side harness connector.
9. Install the ECM [Refer to ENGINE CONTROL MODULE (ECM) ].
Q: Is the measured voltage 0.52 volt or less?

YES : Go to Step 13.

NO : Go to Step 12.
STEP 12. Check ECM connector B-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connector and terminals in good condition?

YES : Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 19.

NO : Repair or replace the faulty connector. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 13. Check ECM connector B-10, intermediate connector C-130, cruise control switch connector C-201 and clock spring connectors C-202 and C-205 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connectors and terminals in good condition?

YES : Go to Step 14.

NO : Repair or replace the faulty connector. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 14. Check the harness wire between ECM connector B-10 terminal number 95 and cruise control switch connector C-201 terminal number 2 for damage.
Q: Is the harness wires in good condition?

YES : Go to Step 15.

NO : Repair the damaged harness wire. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 15. Check the clock spring.
Refer to DRIVER'S AIR BAG MODULE INSPECTION .

Q: Is the clock spring in good condition?

YES : Go to Step 16.

NO : Replace the clock spring (Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING ). Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 16. Using scan tool MB991958, check data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 75: Cancel switch.
    - When "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 86: Main switch.
    - When "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
  - Item 91: Resume switch.
    - When "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 92: Set switch.
    - When "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ). Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ).

NO : Return to Step 2.
STEP 17. Check cruise control switch connector C-201 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connector and terminals in good condition?

YES : Go to Step 18.

NO : Repair or replace the faulty connector. Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 18. Check the cruise control switch.
1. Remove the cruise control switch (Refer to REMOVAL AND INSTALLATION ).
2. Check the cruise control switch (Refer to CRUISE CONTROL SYSTEM COMPONENT CHECK ).
Q: Is the resistance within specifications?

YES : Install the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 19.

NO : Replace the cruise control switch (Refer to REMOVAL AND INSTALLATION ). Then go to Step 21.
STEP 19. Using scan tool MB991958, check data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 75: Cancel switch.
    - When "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 86: Main switch.
    - When "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
  - Item 91: Resume switch.
    - When "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 92: Set switch.
    - When "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 20.

NO : Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ]. When the ECM is replaced, register the encrypted code (Refer to ID CODE REGISTRATION JUDGMENT TABLE ). Then go to Step 21.
STEP 20. Read the DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery cable.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
4. After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnostic trouble code of the cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
Q: Is DTC 15 set?

YES : Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ]. When the ECM is replaced, register the encrypted code (Refer to ID CODE REGISTRATION JUDGMENT TABLE ). Then go to Step 21.

NO : It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 21. Using scan tool MB991958, check data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 75: Cancel switch.
    - When "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 86: Main switch.
    - When "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
  - Item 91: Resume switch.
    - When "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
  - Item 92: Set switch.
    - When "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
    - When "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 22.

NO : Return to Step 2.
STEP 22. Read the DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery cable.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
4. After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnostic trouble code of the cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
Q: Is DTC 15 set?

YES : Return to Step 1.

NO : The procedure is complete.

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V. C. I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
MB991223: Harness Set
MB992006: Extra Fine Probe

CAUTION:

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines.
Whenever the ECM is replaced, ensure that the CAN bus lines are normal.

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  
  Fig 1: Connecting Special Tool MB991910 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the check result satisfactory?

YES : Go to Step 2

NO : Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC CHART ). Then go to Step 16.
STEP 2. Using scan tool MB991958, check data list item 74: Brake light switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 74: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 9.

NO : Go to Step 3.
STEP 3. Using scan tool MB991958, check ETACS system data list item 290: Brake light switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system (Refer to DATA LIST REFERENCE TABLE ).
  - Item 290: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ]. When the ECM is replaced, register the encrypted code (Refer to ID CODE REGISTRATION JUDGMENT TABLE ). Then go to Step 16.

NO : Go to Step 4.
STEP 4. Check stoplight switch connector C-48 and ETACS-ECU connector C-304 and C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Is the connectors and terminals in good condition?

YES : Go to Step 5.

NO : Repair or replace the faulty connector. Then go to Step 16.
STEP 5. Check the harness wire between ETACS-ECU connector C-304 terminal number 1 and stoplight switch connector C-48 terminal number 2, between stoplight switch connector C-48 terminal number 1 and ETACS-ECU connector C-312 terminal number 16 for damage.
Q: Is the harness wire in good condition?

YES : Go to Step 6.

NO : Repair the damaged harness wire. Then go to Step 16.
STEP 6. Check the stoplight switch.
1. Remove the stoplight switch (Refer to BRAKE PEDAL ).
2. Connect an ohmmeter to the stoplight switch between terminals number 1 and 2.
3. Check for continuity between the terminal when the plunger of the stoplight switch is pushed in and when it is released.
4. The stoplight switch is operating properly if the circuit is open between terminals number 1 and 2 when the plunger is pushed in to a depth of within 4.0 mm (0.16 inch) from the outer case edge surface, and if the resistance value is less than 2 ohms between terminals number 1 and 2 when it is released.
  
  Fig 3: Identifying Stoplight Switch Length
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to BRAKE PEDAL ). Then go to Step 7.

NO : Replace the stoplight switch (Refer to BRAKE PEDAL ). Then go to Step 16.
STEP 7. Check fuse number 2 at the ETACS-ECU.
Q: Is the fuse in good condition?

YES : Go to Step 8.

NO : Replace the fuse. Then go to Step 16.

Fig 4: Identifying Fuse Number 2 At ETACS-ECU And Brake Pedal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 8. Using scan tool MB991958, check ETACS system data list item 290: Brake light switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system (Refer to DATA LIST REFERENCE TABLE ).
  - Item 290: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 9.

NO : Replace the ETACS-ECU (Refer to ETACS-ECU ). Then go to Step 16.
STEP 9. Using scan tool MB991958, check data list item 89: Normally closed brake switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 89: Normally closed brake switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 15.

NO : Go to Step 10.
STEP 10. Check ECM connector B-10 and stoplight switch connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Refer to HARNESS CONNECTOR INSPECTION .

Q: Are the connectors and terminals in good condition?

YES : Go to Step 11.

NO : Repair or replace the faulty connector. Then go to Step 16.
STEP 11. Check the harness wire between ECM connector B-10 terminal number 108 and stoplight switch connector C-48 terminal number 3, between stoplight switch connector C-48 terminal number 4 and ground for damage.

Fig 5: Identifying ETACS-ECU Connector Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the harness wire in good condition?

YES : Go to Step 12.

NO : Repair the damaged harness wire. Then go to Step 16.
STEP 12. Check the stoplight switch.
1. Remove the stoplight switch (Refer to BRAKE PEDAL ).
2. Connect an ohmmeter to the stoplight switch between terminals number 3 and 4.
3. Check for continuity between the terminals when the plunger of the stoplight switch is pushed in and when it is released.
4. The stoplight switch is operating properly if the circuit is open between terminals number 3 and 4 when the plunger is released, and if resistance value is less than 2 ohms between terminals number 3 and 4 when the plunger is pushed in to a depth of within 4.5 mm (0.18 inch) from the outer case edge surface.
  
  Fig 7: Identifying Stoplight Switch Length
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to BRAKE PEDAL ). Then go to Step 13.

NO : Replace the stoplight switch (Refer to BRAKE PEDAL ). Then go to Step 16.
STEP 13. Using scan tool MB991958, check data list item 89: Normally closed brake switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 89: Normally closed brake switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 14

NO : Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ]. When the ECM is replaced, register the encrypted code (Refer to ID CODE REGISTRATION JUDGMENT TABLE ). Then go to Step 16.
STEP 14. Using scan tool MB991958, check data list item 74: Brake light switch and item 89: Normally closed brake switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 74: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
  - Item 89: Normally closed brake switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

NO : Return to Step 2.
STEP 15. Read the DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery cable.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
4. With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the DTC of the cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
Q: Is DTC 22 set?

YES : Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ]. When the ECM is replaced, register the encrypted code (Refer to ID CODE REGISTRATION JUDGMENT TABLE ). Then go to Step 16.

NO : It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 16. Using scan tool MB991958, check data list item 74: Brake light switch and item 89: Normally closed brake switch.
1. Connect scan tool MB991958 to the data link connector (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
  - Item 74: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
  - Item 89: Normally closed brake switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 17

NO : Return to Step 2.
STEP 17. Read the DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery cable.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
4. With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the DTC of the cruise control system (Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS ).
Q: Is DTC 22 set?

YES : Return to Step 1.

NO : The procedure is complete.