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Pinpoint Test A: The Speed Control Is Inoperative




Speed Control

Pinpoint Tests

Pinpoint Test A: The Speed Control Is Inoperative

Refer to Wiring Diagram Set 31, Speed Control for schematic and connector information. Diagrams By Number

Normal Operation

The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The signal return is sent to the PCM through circuit RES08 (GN/BN) and the clockspring. When the brake pedal is applied, the stoplamp switch sends a voltage signal to the PCM and the ABS module on circuit CLS17 (YE/GY) to deactivate the speed control if engaged.

The ABS module monitors brake pressure and the stoplamp switch signal from the stoplamp switch. A fault in the ABS module can disable the speed control system.

The speed control deactivator switch (part of the stoplamp switch) interrupts circuit CES09 (VT/OG) removing the voltage signal to the PCM when the brake pedal is applied. 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 speed control
- Stoplamp switch
- Speed control deactivator switch (integral to the stoplamp switch)
- Speed control switches
- Digital Transmission Range (TR) sensor
- Vehicle speed signal
- PCM
- ABS module
- Park brake



PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE

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A1 VERIFY PCM CONFIGURATION


- Enter the following diagnostic mode on the scan 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. TEST the system for normal operation.

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A2 CHECK FOR ABS DTCs


- Review the recorded DTCs from the ABS self-test.
- Are any DTCs recorded?

Yes
REFER to the Antilock Brakes / Traction Control Systems. REPAIR all ABS module DTCs and RETEST the speed control. Testing and Inspection

No
GO to A3.

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A3 CHECK FOR PCM DTCs


- Review the recorded DTCs from the PCM self-test.
- Are any DTCs present?

Yes
For speed control DTCs, REFER to the DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures

For non-speed control DTCs, REFER to Computers and Control Systems Information. REPAIR all PCM DTCs and RETEST the speed control.

No
GO to A4.

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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 PARK BRAKE


- Monitor the park brake indicator while applying and releasing the of the park brake.
- Does the park brake operate correctly?

Yes
GO to A6.

No
REFER to Instrument Panel, Gauges and Warning Indicators to continue diagnosis of the park brake.

-------------------------------------------------
A6 CHECK THE STOPLAMP SWITCH (BOO1 AND BOO2) PIDs


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO1 (brake pedal top travel) and BOO2 ( brake pedal bottom travel) while applying and releasing the brake pedal as follows:





- Do the PID values agree with the brake pedal position?

Yes
If equipped with a floor shift, GO to A7.

If equipped with a column shift, GO to A8.

No
Go To Pinpoint Test B. Pinpoint Test B: DTC P1703 Or DTC P1572

-------------------------------------------------
A7 MONITOR THE PCM (TR) PID


- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM transmission range PID (TR).
- Select DRIVE.
- Does the PID value agree with the TR selector lever position?

Yes
GO to A9.

No
REFER to Transmission Control Systems to continue diagnosis of the digital TR sensor. Testing and Inspection

-------------------------------------------------
A8 MONITOR THE PRNDL DISPLAY


- Monitor the PRNDL display in the Instrument Cluster (IC).
- Select DRIVE.
- Does the PRNDL display agree with the TR selector lever position?

Yes
GO to A9.

No
REFER to Instrument Panel, Gauges and Warning Indicators to continue diagnosis of the PRNDL display.

-------------------------------------------------
A9 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).





- Does the PID value agree with the switch position?

Yes
GO to A10.

No
If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to Speed Control Switch Service and Repair. TEST the system for normal operation.

Otherwise, Go To Pinpoint Test C. Pinpoint Test C: The Speed Control Switches Do Not Operate Correctly

-------------------------------------------------
A10 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. 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.

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