Pinpoint Test A: The Speed Control Is Inoperative
CAUTION:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- A1 VERIFY PCM CONFIGURATION
- Enter the following diagnostic mode on the diagnostic tool: Programmable Parameters
- Verify that the speed control is enabled in the PCM.
- Is the speed control enabled?
- YES : Go to A2.
- NO : Enable the speed control in the PCM using the scan tool programmable parameters menu. If no parameter exists, REFER to MODULE CONFIGURATION article to carry out PCM programmable module installation (PMI). TEST the system for normal operation.
- A2 CHECK FOR DTCs
- Review the recorded DTCs from the PCM self-test.
- Are any non-speed control DTCs recorded?
- YES : REFER to the INTRODUCTION - GASOLINE ENGINES article. REPAIR all PCM DTCs and RETEST the speed control.
- NO : Go to A3.
- A3 CHECK THE VEHICLE SPEED
- Check for correct operation of the speedometer.
- Does the speedometer operate correctly?
- YES : Go to A4.
- NO : REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, & WARNING CHIMES to diagnose the speedometer.
- A4 CHECK THE STOPLAMP SWITCH (BOO AND BPA) PIDs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO (brake pedal top travel) and BPA (brake pedal bottom travel). while applying and releasing the brake pedal as follows:
Brake Pedal Position BOO PID BPA PID Released Off Off Applied lightly On Off Applied firmly On On - Do the PID values agree with the brake pedal position?
- YES
: If equipped with an automatic transaxle, GO to A6.
If equipped with a manual transaxle, GO to A5.
- NO : Go To PINPOINT TEST B .
- A5 CHECK THE CPP SWITCH (CPP_TOP) PID
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PID CPP_TOP while pressing and releasing the clutch pedal.
- Does the PID value agree with the clutch pedal position?
- YES : GO to A7.
- NO : Go to PINPOINT TEST D .
- A6 MONITOR THE TR PID
- Enter the following diagnostic mode on the scan tool: Transmission Control Module (TCM) DataLogger.
- Monitor the TCM PID (TR).
- Select DRIVE.
- Does the PID value agree with the TR selector lever position?
- YES : Go to A7.
- NO : REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - AISIN AW21 or AUTOMATIC TRANSAXLE/TRANSMISSION - FNR5 to continue diagnosis of the digital TR sensor.
- A7 CHECK THE SPEED CONTROL SWITCH
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Press each speed control switch while monitoring the speed control switch PID (SCCS).
Speed Control Switch SCCS PID Value - NONE Pressed RESUME RESUME OFF Off ON On SET + SET/+ SET - COAST/- - Does the PID value agree with the switch position?
- YES : Go to A8.
- NO
: If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.
Otherwise, Go To PINPOINT TEST C .
- A8 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- YES : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L , ELECTRONIC ENGINE CONTROLS - 3.0L (4V) , or ELECTRONIC ENGINE CONTROLS - 3.5L . TEST the system for normal operation.
- NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.