Pinpoint Test A: The Cruise Control Is Inoperative
Cruise Control
Pinpoint Test A: The Cruise Control Is Inoperative
Refer to Wiring Diagram Set 31, Cruise Control for schematic and connector information Electrical Diagrams.
Normal Operation
The cruise control functionality is controlled through the cruise control switches that are hard-wired to the Instrument Panel Cluster (IPC) through a signal and return circuit.
There are 5 cruise control switches with each switch operating a specific function that uses different resistance values. The IPC (Instrument Panel Cluster) sends out a reference voltage to the cruise control switches and monitors the voltage drop when a cruise control switch is pressed. The voltage drop varies depending upon the resistance of each switch, providing a specific indication to the IPC (Instrument Panel Cluster) which switch is pressed. The IPC (Instrument Panel Cluster) sends a network message over the High Speed Controller Area Network (HS-CAN) to the PCM relaying the switch status and requesting cruise control operation.
The stoplamp switch and cruise control deactivator switch signals are inputs to the PCM for the cruise control operation.
When the brake pedal is applied, the normally open stoplamp switch closes and applies a voltage signal to the PCM deactivating the cruise control, if engaged.
The cruise control deactivator switch is a normally closed switch that provides a ground signal to the IPC (Instrument Panel Cluster). When the brake pedal is applied, the switch opens and removes the ground signal to the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) sends a network message over the High Speed Controller Area Network (HS-CAN) to the PCM. This is a redundant signal to the PCM.
The PCM receives both signals and compares the inputs to confirm that the correct brake input sequence is received.
Vehicles equipped with a manual transaxle have an additional clutch pedal cruise control deactivator switch. The clutch pedal cruise control deactivator switch is a normally open switch with the clutch pedal not pressed. When the clutch pedal is applied, the clutch pedal cruise control deactivator switch moves to the closed position, which routes the ground signal to the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) sends a network message over the High Speed Controller Area Network (HS-CAN) to the PCM, deactivating the cruise control system.
- DTC P0704:01 (Clutch Switch Input Circuit: General Electrical Failure)- sets when the IPC (Instrument Panel Cluster) detects a short to ground in the clutch pedal cruise control deactivator switch signal during the self-test.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Clockspring
- Digital Transmission Range (TR) sensor (automatic transaxle)
- Cruise control switch
- Cruise control deactivator switch
- Stoplamp switch
- Clutch pedal cruise control deactivator switch (manual transaxle)
- IPC (Instrument Panel Cluster)
- PCM
- ABS module
PINPOINT TEST A : THE CRUISE CONTROL IS INOPERATIVE
A1 CHECK FOR DTCs
- Review the recorded DTCs from the PCM and IPC (Instrument Panel Cluster) self-test.
Are any DTCs recorded?
Yes
For DTC P0704, GO to A5.
Otherwise, REFER to DTC Charts Cruise Control.
No
GO to A2.
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 MONITOR THE BRAKE PEDAL PIDs
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) while applying and releasing the brake pedal as follows:
Brake Pedal Position BOO1 PID BOO2 PID Released Off Off Applied lightly On Off Applied firmly On On
Do the PID values agree with the brake pedal position?
Yes
For automatic transaxle, GO to A4.
For manual transaxle, GO to A5.
No
GO to Pinpoint Test B Pinpoint Test B: DTC P0504 OR DTC P1572:01.
A4 MONITOR THE PCM TRANSGEAR PID
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PID (TRANSGEAR).
- Select DRIVE.
Does the PID value agree with the TRANSGEAR selector lever position?
Yes
GO to A6.
No
REFER to Automatically Shifted Manual Transmission/Transaxle to continue diagnosis of the digital TR (Transmission Range) sensor.
A5 CHECK THE CLUTCH PEDAL CRUISE CONTROL DEACTIVATOR SWITCH 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 read "YES" with the clutch pedal pressed and "NO" with the clutch pedal released?
Yes
GO to A6.
No
If the CPP_TOP value always reads YES (pressed) GO to A7.
If the CPP_TOP value always reads NO (released) GO to Pinpoint Test D Pinpoint Test D: The Cruise Control Does Not Disengage When The Clutch Pedal Is Pressed.
A6 CHECK THE CRUISE CONTROL SWITCH PID
- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.
- Press each cruise control switch while monitoring the cruise control switch PID (CRUISE_SW).
Cruise Control Switch CRUISE_SW PID Value- NONE Pressed CAN/RES CANCEL ON ON OFF OFF SET + SET + SET - SET-
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 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.
A7 CHECK THE CLUTCH PEDAL SWITCH PID WITH THE CLUTCH PEDAL CRUISE CONTROL DEACTIVATOR SWITCH DISCONNECTED
- Disconnect: Clutch Pedal Cruise Control Deactivator Switch C277.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PID CPP_TOP.
Does the PID value read NO?
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 circuit CE904 (GN/VT) for a short to ground. TEST the system for normal operation.
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 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.