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 function is controlled by the tow haul switch located on the shifter assembly. The tow haul status is transmitted to the Instrument Panel Cluster (IPC) from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus.

If the tow haul request message is missing or invalid for less than 5 seconds, the tow haul indicator remains in the last on/off state, based upon the last known good tow haul request message received.

If the tow haul request message is missing for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the tow haul indicator on.

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC



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

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AD1 CHECK THE OPERATION OF THE TOW HAUL FUNCTION


- Verify that the tow haul function operates correctly.
- Does the tow haul function operate correctly?

Yes
GO to AD2.

No
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

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AD2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Retrieve the 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 AD3.

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AD3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


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

Yes
For DTC U0100:00, GO to Pinpoint Test AV. Pinpoint Tests AV: DTC U0100:00

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

No
GO to AD4.

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AD4 CHECK THE TOW HAUL INDICATOR USING THE IPC DEALER TEST MODE


- Ignition ON.
- Enter Instrument Panel Cluster (IPC) Dealer Test Mode.
- Scroll down to the tELtAL tESt (base IPC) or TELLTALE TEST (message center IPC) displays.
- Monitor the tow haul indicator.
- Is the tow haul indicator illuminated?

Yes
INSTALL a new PCM. REFER to Computers and Control Systems. 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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