Pinpoint Test A: The Cruise Control Is Inoperative

Cruise Control

Pinpoint Test A: The Cruise Control Is Inoperative

Normal Operation

A reference voltage is sent from the PCM to the steering wheel cruise control switches. When a switch is pressed, the voltage is routed through a specific resistor value for each function. The PCM provides the 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 (integral to the stoplamp switch) removes the voltage signal to the PCM when the brake pedal is applied firmly. This is a redundant signal to the PCM.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- PCM not configured for cruise control

- Cruise control switch

- Digital Transmission Range (TR) sensor

- Vehicle Speed Sensor (VSS)

- PCM

- ABS module fault

PINPOINT TEST A : THE CRUISE CONTROL IS INOPERATIVE

NOTICE: 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 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 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 A3.

A3 CHECK FOR PCM DTCs

- Review the recorded DTCs from the PCM self-test.

Are any PCM DTCs recorded?

Yes
REFER to DTC Charts. Cruise Control

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 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 firmly On On

Do the PID values agree with the brake pedal position?

Yes
GO to A6.

No
GO to Pinpoint Test B. Pinpoint Test B: DTC P1703

A6 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).

Cruise Control Switch SCCS PID Value- NONE Pressed RESUME RESUME OFF Off ON On SET + SET/+ SET - SET/-

Does the PID value agree with the switch position?

Yes
GO to A7.

No
If only one switch does not display the correct PID value, INSTALL a new cruise control switch. REFER to 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

A7 MONITOR THE TR (Transmission Range) 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 transmission range selector lever position?

Yes
GO to A8.

No
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems to continue diagnosis of the digital TR (Transmission Range) sensor.

A8 CHECK FOR CORRECT PCM OPERATION

- Ignition OFF.

- 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. 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. CLEAR the DTCs. REPEAT the self-test.