Pinpoint Tests AD: The Tow Haul Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AD: The Tow Haul Indicator Is Never/Always On

Normal Operation

The tow haul indicator illuminates when the tow haul system has been engaged and is actively providing tow haul control for the vehicle. The Instrument Panel Cluster (IPC) receives the tow haul indicator request from the Transmission Control Module (TCM) (diesel engine) or from the PCM (gasoline engines) over the High Speed Controller Area Network (HS-CAN) communication bus.

If the tow haul indicator request message is missing or invalid for less than 5 seconds, the tow haul indicator remains in the last indication state (on or off), based upon the last known good message received. If the tow haul indicator request message is missing for more than 5 seconds, the IPC sets DTC U0101:00 in continuous memory and defaults the tow haul indicator off.

This pinpoint test is intended to diagnose the following:

- PCM (gasoline engines)
- TCM (diesel engine)
- IPC

PINPOINT TEST AD: THE TOW HAUL INDICATOR IS NEVER/ALWAYS ON

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AD1 RETRIEVE AND RECORD THE IPC DTCs FROM THE SELF-TEST

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

Yes
For DTC U0100:00, GO to Pinpoint Test BA. For DTC U0101:00, GO to Pinpoint Test BB. For all other DTCs, REFER to DTC Charts. Pinpoint Tests BA: DTC U0100:00 Pinpoint Tests BB: DTC U0101:00

No
If equipped with gasoline engine, GO to AD2. If equipped with diesel engine, GO to AD3.

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AD2 RETRIEVE AND RECORD THE 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 AD4.

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AD3 RETRIEVE AND RECORD THE DTCs FROM THE TCM SELF-TEST

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

Yes
REFER to Automatic Transaxle/Transmission - TorqShift(R)6 Testing and Inspection.

No
GO to AD4.

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AD4 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 all lamps (ALL_LAMP) active command. Command all the lamps on and off. Observe the tow haul indicator.
- Does the tow haul indicator illuminate when commanded on and turn off when commanded off?

Yes
For gasoline engines, INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation. For diesel engine, INSTALL a new TCM. REFER to Transmission Service Components - Exploded View, External Components in Automatic Transaxle/Transmission - TorqShift(R)6. TEST the system for normal operation.

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

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