Pinpoint Tests AA: The Speed Control Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests


Pinpoint Test AA: The Speed Control Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the speed control signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the speed control is engaged, the PCM sends a message to the IPC to illuminate the speed control indicator. If the speed control message is missing for less than 5 seconds, the IPC defaults the speed control indicator to the last on/off state, based upon the last known good speed control message received.

If the speed control message is missing for more than 5 seconds, the IPC sets DTC U0100:87 in continuous memory and defaults the speed control indicator off.

NOTE: If DTC U0100:87 is set in the IPC, other observable symptoms can be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC



PINPOINT TEST AA: THE SPEED CONTROL INDICATOR IS NEVER/ALWAYS ON

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AA1 CHECK THE SPEED CONTROL OPERATION


- Check the speed control system for correct operation.
- Does the speed control operate correctly?

Yes
GO to AA2.

No
REFER to Fire Suppression System.

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AA2 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC speed control indicator (CRUISE) active command. Command the speed control indicator on and off while observing the speed control indicator.
- Does the speed control indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to AA3.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AA3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

Yes
For DTC U0100:87, GO to Pinpoint Test AQ. Pinpoint Tests AQ: DTC U0100:87

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.

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