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

Instrumentation and Warning Chimes

Pinpoint Test

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

Normal Operation

The Instrument Cluster (IC) receives the cruise control status from the Smart Junction Box (SJB) over the High Speed Controller Area Network (HS-CAN) communication bus. When the cruise control has been engaged, the SJB sends a message to the IC to illuminate the cruise control indicator. The IC sets DTC U0100 in continuous memory if the cruise control message is missing for more than 5 seconds and the IC turns off the cruise control indicator.

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


- Verify that the cruise control operates correctly.
- Does the cruise control operate correctly?

Yes
GO to T2.

No
REFER to Fire Suppression System.

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T2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


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

Yes
REFER to Computers and Control Systems Information.

No
GO to T3.

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T3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Retrieve the recorded DTCs from the IC self-test.
- Is DTC U0100 retrieved?

Yes
GO to Pinpoint Test AK. Pinpoint Tests AK: DTC U0100

No
GO to T4.

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


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC cruise control indicator (SC_SET) active command. Command the cruise control indicator on then off again. 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 Computers and Control Systems. 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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