Pinpoint Test A: The Cruise Control Is Inoperative
Cruise Control
Pinpoint Tests
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 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 manual transmission have an additional clutch pedal cruise control deactivator switch. The clutch pedal cruise control deactivator switch provides a ground signal to the PCM. When the clutch pedal is applied the normally closed clutch pedal cruise control deactivator switch opens and removes the ground signal to the PCM which deactivates the cruise control, if engaged.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals and connectors
- PCM not configured for cruise control
- Cruise control switch
- Stoplamp switch
- Digital Transmission Range (TR) sensor system concern (automatic transmission)
- Clutch pedal cruise control deactivator switch (manual transmission)
- PCM
- ABS 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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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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.
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A2 CHECK FOR DTCs
- Review the recorded DTCs from the PCM self-test.
- Are any PCM DTCs recorded?
Yes
REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to A3.
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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 Panel, Gauges and Warning Indicators to diagnose the speedometer.
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A4 CHECK THE STOPLAMP SWITCH (BOO) PID
- 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:
- Does the PID value agree with the brake pedal position?
Yes
GO to A5.
No
GO to Pinpoint Test B. Pinpoint Test B: DTC P1703
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A5 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 SCCS PID (cruise control switch).
- Does the PID value agree with the switch position?
Yes
If equipped with an automatic transmission, GO to A6.
If equipped with a manual transmission, 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 Cruise Control Switch. TEST the system for normal operation.
Otherwise, GO to Pinpoint Test C. Pinpoint Test C: DTC P0579 Or DTC P0581
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A6 CHECK THE DIGITAL TR SENSOR PID
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM TR PID.
- Select DRIVE.
- Does the PID value agree with the transmission range selector lever position?
Yes
GO to A10.
No
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems to diagnose the TR input concern.
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A7 CHECK THE CLUTCH PEDAL CRUISE CONTROL DEACTIVATOR SWITCH PID (CPP_TOP)
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM CPP_TOP PID while pressing and releasing the clutch pedal.
- Does the clutch pedal cruise control deactivator switch PID agree with the clutch pedal position?
Yes
GO to A10.
No
GO to A8.
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A8 CHECK THE CLUTCH PEDAL CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Clutch Pedal Cruise Control Deactivator Switch C277.
- Measure the resistance between the clutch pedal cruise control deactivator switch C277-3, circuit GD129 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A9.
No
REPAIR the circuit. TEST the system for normal operation.
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A9 CHECK THE CLUTCH PEDAL CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Disconnect: PCM C175b.
- Measure the resistance between the PCM C175b-39, circuit CE904 (GN/VT), harness side and the clutch pedal cruise control deactivator switch C277-1, circuit CE904 (GN/VT), harness side; and between the PCM C175b-39, circuit CE904 (GN/VT), harness side and ground.
- Is the resistance less than 5 ohms between the PCM and the clutch pedal cruise control deactivator switch, and greater than 10,000 ohms between the PCM and ground?
Yes
INSTALL a new clutch pedal cruise control deactivator switch. REFER to Cruise Control Deactivator Switch Cruise Control Deactivator Switch. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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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. REFER to 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.
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