Pinpoint Test T: The Cruise Control Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test T: The Cruise Control Indicator Is Never/Always On

Normal Operation

The Instrument Cluster (IC) receives the cruise control signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the cruise control is engaged, the PCM sends a message to the IC to illuminate the cruise control indicator. If the cruise control message is missing or if the data is deemed invalid by the IC for greater than 5 seconds, the IC sets DTC U0100 and defaults the cruise control off.

NOTE: If DTC U0100 is set in the IC other symptoms may also be present such as an inoperative speedometer, tachometer or temperature gauge.

This pinpoint test is intended to diagnose the following:

- PCM
- IC

PINPOINT TEST T: THE CRUISE CONTROL INDICATOR IS NEVER/ALWAYS ON

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T1 CHECK THE CRUISE CONTROL OPERATION


- Operate the cruise control and verify that the cruise control operates correctly.
- Does the cruise control operate correctly?

Yes
GO to T2.

No
REFER to Cruise Control Testing and Inspection.

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T2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
GO to Pinpoint Test AT. Pinpoint Test AT: DTC U0100

No
GO to T3.

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T3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?

Yes
REFER to Computers and Control Systems.

No
GO to T4.

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T4 CARRY OUT THE IC INDICATOR LAMP ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger .
- Select the IC cruise control (CRUISE) active command on and off. Observe the cruise control indicator.
- Does the cruise control indicator illuminate when commanded on and turn off when commanded off?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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