Diagnostic Test

ACTIVE DTC
1. Start the engine and allow it to idle for at least 60 seconds.
  WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
  
  NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.
2. With the scan tool, select View DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
SPEED CONTROL ON/OFF SWITCH
1. With the scan tool, monitor the Speed Control Switch voltage.
2. Disconnect the Speed Control On/Off Switch harness connector.
  Did the voltage change to greater than 4.7 Volts?
  
  Yes
  - Replace the Speed Control On/Off Switch.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
SPEED CONTROL RESUME/ACCEL SWITCH
1. With the scan tool, monitor the Speed Control Switch voltage.
2. Disconnect the Speed Control Resume/Accel Switch harness connector.
  Did the voltage change to greater than 4.7 Volts?
  
  Yes
  - Replace the Speed Control Resume/Accel Switch.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
CLOCKSPRING
1. Turn the ignition off.
2. Disconnect the C1 Clockspring harness connector in accordance with the Service Information.
3. Ignition on, engine not running.
4. With the scan tool, read the S/C Switch voltage.
  Did the S/C Switch Volts change to 5 Volts?
  
  Yes
  - Replace the Clockspring.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 5
(V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 1: Measuring Resistance Between Ground And S/C Switch Signal Circuit In Speed Control Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Connect the Clockspring harness connectors in accordance with the Service Information.
3. Disconnect the C3 PCM harness connector.
  CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.
4. Measure the resistance between ground and the (V38) S/C Switch No. 2 Signal circuit to the appropriate terminal of special tool #8815.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (V38) S/C Switch No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT

Fig 2: Measuring Resistance Between S/C Switch Signal Circuit And S/C Switch Return Circuit In Speed Control Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (V937) S/C Switch Return circuit and the (V38) S/C Switch No. 2 Signal circuit in the Speed Control Switch.
  Is the resistance below 5 Ohms?
  
  Yes
  - Repair the short between the (V38) S/C Switch No. 2 Signal circuit and the (V937) S/C Switch Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7

SPEED CONTROL SWITCH VOLTAGE VALUES

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 and PCM Pinout Box Adapter 8815-1 to perform diagnosis.

Install Miller Special Tool #8815-1 on the C3 PCM harness connector.
Connect the S/C Switch harness connectors.
Connect the Clockspring harness connectors.
Turn the ignition on.
With the scan tool, monitor the S/C Switch voltage readings.
Using a voltmeter check the voltage on the (V37) S/C Switch No. 1 Signal circuit and the (V38) S/C Switch No. 2 signal circuit at the appropriate terminals of the special tool #8815.
Monitor the voltmeter.
With the scan tool, monitor the S/C Switch voltage readings.
Compare the voltage readings on the voltmeter to what the scan tool displayed.

SWITCH POSITION	SWITCH No. 1 VOLTAGE VALUE	SWITCH No. 2 VOLTAGE VALUE
NO SWITCHES PRESSED	4.31 to 4.78 Volts	4.31 to 4.78 Volts
ON/OFF PRESSED	0.59 and 1.13 Volts	3.53 and 3.92 Volts
RES/ACCEL PRESSED	3.88 to 4.17 Volts	2.04 to 2.47 Volts
SET PRESSED	3.16 to 3.56 Volts	1.17 to 1.56 Volts
COAST PRESSED	2.57 to 2.94 Volts	0.77 to 1.09 Volts
CANCEL PRESSED	1.59 to 1.99 Volts	2.84 to 3.25 Volts

POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify there is good pin to terminal contact in the Switch and PCM connectors.
4. Refer to any Technical Service Bulletins (TSBs) that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Replace and program the PCM in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .