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

Instrumentation, Message Center and Warning Chimes

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

Normal Operation

The Instrument Panel Cluster (IPC) receives the cruise control indicator request from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the cruise control is engaged, the PCM sends a request to the IPC (Instrument Panel Cluster) to illuminate the cruise control indicator.

If the cruise control indicator request is missing or if the data is deemed invalid for less than 5 seconds, the cruise control indicator remains in the last indication mode (on or off) based on the last known good request received. If the cruise control indicator request is missing for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0100:00 in continuous memory and defaults the cruise control indicator off.

NOTE: If DTC U0100:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM

- IPC (Instrument Panel Cluster)

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

U1 CHECK THE CRUISE CONTROL OPERATION

- Operate the cruise control.

Does the cruise control operate correctly?

Yes
GO to U2.

No
REFER to Fire Suppression System.

U2 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) cruise control indicator (CRUISE) active command. Command the cruise control indicator on and off. Observe the cruise control indicator.

Does the cruise control indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to U3.

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

U3 RETRIEVE AND RECORD THE DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

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

Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to U4.

U4 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test AM Pinpoint Test AM: DTC U0100:00 and P1607:87.

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

No
INSTALL a new PCM. TEST the system for normal operation.