Pinpoint Test A: The Speed Control Is Inoperative
Speed Control
Pinpoint Tests
Pinpoint Test A: The Speed Control Is Inoperative
Normal Operation
For all speed control systems, the PCM sends a signal through circuit VES10 (WH) to the speed control switches which passes through the clockspring. The return signal is sent through circuit RES08 (GN/BN) and the clockspring. The speed control system deactivates when the brake pedal is applied or the speed control OFF switch is pressed. On vehicles with the adaptive cruise control system, the Cruise-Control Module (C-CM) communicates with the Instrument Panel Cluster (IPC), ABS module and PCM over the High Speed Controller Area Network (HS-CAN). A fault in the C-CM causes an inoperative condition for the speed control system and a message is displayed in the message center.
U0121:00-U2515:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM not configured for speed control
- Speed control switch
- Speed control sensor alignment (with adaptive cruise control)
- Digital Transmission Range (TR) sensor
- Vehicle speed signal
- PCM
- C-CM (with adaptive cruise control)
- ABS module (with adaptive cruise control)
- IPC (with adaptive cruise control)
PINPOINT TEST A: THE SPEED 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.
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A1 VERIFY PCM CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Programmable Parameters.
- For vehicles without adaptive cruise control, verify that the speed control system is enabled in the PCM. For vehicles with adaptive cruise control, verify that the adaptive cruise control system is enabled in the PCM.
- Is the speed control system enabled?
Yes
GO to A2.
No
ENABLE the speed control system in the PCM using the scan tool programmable parameters menu. TEST the system for normal operation.
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A2 CHECK FOR PCM DTCs
- Review the recorded DTCs from the PCM self-test.
- Are any PCM DTCs recorded?
Yes
REFER to DTC Charts.
No
If the vehicle is equipped with adaptive cruise control, GO to A3.
Otherwise, GO to A11.
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A3 CHECK THE C-CM DTCs
- Review the recorded DTCs from the C-CM self-test.
- Are any C-CM DTCs recorded?
Yes
For DTC U0121:00 or DTC U0155:00, GO to A6.
For all other C-CM DTCs, REFER to DTC Charts.
No
GO to A4.
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A4 CHECK THE MESSAGE CENTER FOR "CRUISE CONTROL NOT AVAILABLE" MESSAGE
- Start the engine.
- Press and release the speed control ON/OFF switch while observing the message display center.
- Does the message center display "CRUISE NOT AVAILABLE" when pressing the ON/OFF Switch?
Yes
CARRY OUT the sensor alignment procedure. REFER to Speed Control Sensor Adjustment Adjustments.
If the concern is still present, GO to A18.
No
GO to A5.
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A5 CHECK THE ABS MODULE DTCs FOR A HARD FAULT
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Carry out the ABS module self-test.
- Are any ABS module DTCs recorded?
Yes
For DTC U2515 or DTC U0405, GO to A9.
For all other ABS module DTCs, REFER to Antilock Brakes / Traction Control Systems. Testing and Inspection
No
GO to A11.
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A6 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0121:00 or DTC U0155:00 set in the C-CM module?
Yes
GO to A7.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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A7 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- C-CM
- IPC
- ABS module
- Is DTC B1316, B1317, B1318, U3003:16 or U3003:17 recorded in any module?
Yes
For C-CM, GO to DTC Charts.
For all other modules, REFER to Body Control Systems.
No
GO to A8.
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A8 CHECK FOR DTC U0121, U0121:00, U0155 or U0155:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0121, U0121:00, U0155 or U0155:00 set in more than one module?
Yes
For DTC U0121 or U0121:00, GO to A16.
For DTC U0155 or U0155:00, GO to A17.
No
If there is an observable symptom, GO to Symptom Chart to diagnose the observed symptom. Symptom Related Diagnostic Procedures
If there is no observable symptom, DISREGARD the DTC.
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A9 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the C-CM.
- Is DTC U3003:16 or DTC U3003:17 recorded in the C-CM?
Yes
For the C-CM, REFER to DTC Charts.
No
GO to A10.
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A10 CHECK FOR DTC U0104:00 SET IN THE IPC
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Review the recorded results from the IPC self-test.
- Is DTC U0104:00 set in the IPC?
Yes
GO to A18.
No
If there is an observable symptom, GO to Symptom Chart to diagnose the observed symptom. Symptom Related Diagnostic Procedures
If there is no observable symptom, DISREGARD the DTC.
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A11 CHECK THE VEHICLE SPEED SIGNAL
- Check for correct operation of the speedometer.
- Does the speedometer operate correctly?
Yes
GO to A12.
No
REFER to Instrument Panel, Gauges and Warning Indicators to continue diagnosis of the speedometer.
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A12 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 (top travel) and BPA (bottom travel) while applying and releasing the brake pedal as follows:
- Do the PID values agree with the brake pedal positions?
Yes
GO to A13.
No
Go To Pinpoint Test B. Pinpoint Test B: DTC P1703
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A13 CHECK THE SPEED CONTROL SWITCH
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Press each speed control switch button while monitoring the SCCS PID (speed control switch).
- Does the PID value agree with the switch position?
Yes
GO to A14.
No
If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to Speed Control Switch Speed 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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A14 MONITOR THE PCM PID TR
- 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 A15.
No
REFER to Transmission Control Systems to continue diagnosis of the digital TR sensor. Testing and Inspection
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A15 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. TEST the system for normal operation.
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A16 CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Disconnect the ABS module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ABS module connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ABS module. CLEAR all continuous DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test.
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A17 CHECK FOR CORRECT IPC OPERATION
- Ignition OFF.
- Disconnect the IPC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IPC. CLEAR all continuous DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test.
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A18 CHECK FOR CORRECT C-CM OPERATION
- Disconnect the C-CM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the C-CM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new C-CM. REFER to Cruise-Control Module (C-CM) Service and Repair. 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. REPEAT the self-test.
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