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

Instrumentation, Message Center and Warning Chimes

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 (Instrument Panel Cluster) 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 (Transmission Control Module) (diesel engine)

- IPC (Instrument Panel Cluster)

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

AD1 RETRIEVE AND RECORD THE IPC (Instrument Panel Cluster) DTCs FROM THE 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 BA. Pinpoint Test BA: DTC U0100:00

For DTC U0101:00, GO to Pinpoint Test BB. Pinpoint Test BB: DTC U0101:00

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
If equipped with gasoline engine, GO to AD2.

If equipped with diesel engine, GO to AD3.

AD2 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 DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to AD4.

AD3 RETRIEVE AND RECORD THE DTCs FROM THE TCM (Transmission Control Module) SELF-TEST

- Check for recorded TCM (Transmission Control Module) DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

No
GO to AD4.

AD4 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) 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. TEST the system for normal operation.

For diesel engine, INSTALL a new TCM (Transmission Control Module). TEST the system for normal operation.

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