Pinpoint Test A: The Cruise Control Is Inoperative
Cruise Control
Pinpoint Tests
Pinpoint Test A: The Cruise Control Is Inoperative
Refer to Wiring Diagram Set 31, Speed Control for schematic and connector information. Diagrams By Number
Normal Operation
A reference voltage is sent from the PCM to the steering wheel cruise control switches. When a switch is pressed, voltage is routed through a specific resistor value for each function. The PCM provides ground for the reference voltage to determine which control input function has been selected. When the brake pedal is applied, the PCM deactivates the cruise control, if engaged.
The cruise control deactivator switch interrupts the voltage signal to the PCM when the brake pedal is applied. This is a redundant signal to the PCM.
Vehicles equipped with a gasoline engine and a manual transmission have an additional Clutch Pedal Position (CPP) switch. The CPP switch provides a ground signal to the PCM. When the clutch pedal is applied, the normally closed CPP switch opens and removes the ground signal to the PCM which deactivates the cruise control, if engaged.
Vehicles equipped with a diesel engine and a manual transmission have an additional CPP switch. The CPP switch, normally closed, supplies a voltage signal to the PCM. When the clutch pedal is applied, the CPP switch moves to the open position causing the PCM to lose the voltage signal and deactivate the cruise control.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM not configured for cruise control
- Cruise control switches
- Stoplamp switch
- Cruise control deactivator switch
- CPP switch (manual transmission)
- Digital Transmission Range (TR) sensor (automatic transmission)
- PCM
- ABS fault
PINPOINT TEST A: THE CRUISE CONTROL IS INOPERATIVE
-------------------------------------------------
A1 VERIFY PCM CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Programmable Parameters.
- Verify that the cruise control is enabled in the PCM.
- Is the cruise control enabled?
Yes
GO to A2.
No
ENABLE the cruise control in the PCM using the scan tool programmable parameters menu. TEST the system for normal operation.
-------------------------------------------------
A2 CHECK FOR DTCs
- Review the recorded DTCs from the PCM self-test.
- Are any DTCs recorded?
Yes
REFER to DTC Charts.
No
GO to A3.
-------------------------------------------------
A3 CHECK FOR ABS MODULE DTCs
- Review the recorded DTCs from the ABS module self-test.
- Are any DTCs recorded?
Yes
REFER to Antilock Brakes / Traction Control Systems. REPAIR all ABS module DTCs and RETEST the system.
No
GO to A4.
-------------------------------------------------
A4 CHECK THE VEHICLE SPEED
- Check for correct operation of the speedometer.
- Does the speedometer operate correctly?
Yes
GO to A5.
No
REFER to Instrument Panel, Gauges and Warning Indicators to continue diagnosis of the speedometer.
-------------------------------------------------
A5 CHECK THE STOPLAMP SWITCH (BOO) AND CRUISE CONTROL DEACTIVATOR SWITCH (BPA) PIDs
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO (brake pedal top travel) and BPA (cruise control deactivator switch) while applying and releasing the brake pedal as follows:
- Do the PID values agree with the brake pedal position?
Yes
If equipped with an automatic transmission, GO to A7.
If equipped with a manual transmission, GO to A6.
No
GO to Pinpoint Test B. Pinpoint Test B: DTC P1703 Or DTC P1572
-------------------------------------------------
A6 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 A8.
No
For vehicles equipped with a gasoline engine, GO to Pinpoint Test D. Pinpoint Test D: The Cruise Control Does Not Disengage When The Clutch Is Applied
For vehicles equipped with a diesel engine, GO to Pinpoint Test E.
-------------------------------------------------
A7 MONITOR THE TR PID
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PID (TR).
- Select DRIVE.
- Does the PID value agree with the TR selector lever position?
Yes
GO to A8.
No
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems to continue diagnosis of the digital TR sensor.
-------------------------------------------------
A8 CHECK THE CRUISE CONTROL SWITCH
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Press each cruise control switch button while monitoring the cruise control switch PID (SCCS).
- Does the PID value agree with the switch position?
Yes
GO to A9.
No
If only one switch does not display the correct PID value, INSTALL a new cruise control switch. REFER to Cruise Control Switch Cruise Control Switch. TEST the system for normal operation.
Otherwise, GO to Pinpoint Test C. Pinpoint Test C: The Cruise Control Switches Do Not Operate Correctly
-------------------------------------------------
A9 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 are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new PCM. REFER to Computers and Control Systems or Computers and Control Systems. 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.
-------------------------------------------------