Pinpoint Test Y: The Powertrain Malfunction (Wrench) Message Center Indicator Is Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Y: The Powertrain Malfunction (Wrench) Message Center Indicator Is Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives requests from the PCM and Transfer Case Control Module (TCCM) to control the powertrain malfunction (wrench) message center indicator. The PCM provides an indicator request for Electronic Throttle Control (ETC) faults and transmission faults over the High Speed Controller Area Network (HS-CAN). The TCCM provides an indicator request for Four-Wheel Drive (4WD) faults over the HS-CAN.

If the indicator request message for ETC or transmission faults is missing or if the data is deemed invalid for less than 5 seconds, the powertrain malfunction (wrench) message center indicator remains in the last state (on or off) based upon the last known good message received. If the indicator request message for ETC or transmission faults is missing or if the data is deemed invalid by the IPC for greater than 5 seconds, the IPC sets DTC U0100:00 and defaults the powertrain malfunction (wrench) message center warning indicator active (on).

If the indicator request message for the 4WD faults is missing or deemed invalid for less than 5 seconds, the powertrain malfunction (wrench) message center indicator remains in the last state (on or off) based upon the last known good message received. If the indicator request message is missing or if the data is deemed invalid by the IPC for greater than 5 seconds, the IPC sets DTC U0102:00 and defaults the powertrain malfunction (wrench) message center warning indicator active (on).

NOTE: If DTC U0100:00 sets in the IPC, other symptoms may also be present such as an inoperative speedometer, tachometer or temperature gauge. If DTC U0102:00 sets in the IPC, other symptoms may also be present such as an inoperative 4X4 high or 4X4 low indicator when equipped with Electronic Shift-On-The-Fly (ESOF).

This pinpoint test is intended to diagnose the following:

- Message center concern
- ETC concern
- 4WD concern (if equipped)
- Transmission concern

PINPOINT TEST Y: THE POWERTRAIN MALFUNCTION (WRENCH) MESSAGE CENTER INDICATOR IS ALWAYS ON

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Y1 VERIFY THE OPERATION OF THE DOOR AJAR MESSAGE CENTER WARNING INDICATOR

- Close all doors then open the LH front door.
- Ignition ON.

- NOTE: If multiple warnings are present, the message center cycles through each of the warning indicators. Allow the displays to cycle through each display while determining whether the door ajar message center warning indicator is active.

- Observe the message center.
- Is the door ajar message center warning indicator active?

Yes
GO to Y2.

No
GO to Pinpoint Test AF Pinpoint Tests AF: The Message Center Is Not Operating Correctly.

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Y2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Is DTC U0100:00 or DTC U0102:00 recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test AT Pinpoint Tests AT: DTC U0100:00. For DTC U0102:00, GO to Pinpoint Test AU Pinpoint Tests AU: DTC U0102:00.

No
GO to Y3.

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Y3 RETRIEVE THE RECORDED 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
REFER to Four Wheel Drive (4WD) Systems Testing and Inspection to diagnose TCCM DTCs.

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