Pinpoint Test W: The Powertrain Malfunction (Wrench) Warning Indicator is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test W: The Powertrain Malfunction (Wrench) Warning Indicator is Never/Always On

Normal Operation

The powertrain malfunction (wrench) warning indicator can be turned on by 1 of 2 modules. The PCM provides the Electronic Throttle Control (ETC) status and the transmission status, and the 4X4 control module (if equipped) provides a status of the All-Wheel Drive (AWD) system to the Instrument Cluster (IC). Each module monitors the powertrain for their respective function(s) and provides the IC with the operating status over the High Speed Controller Area Network (HS-CAN) communication bus. When a fault condition exists in any of the monitored systems, the PCM or 4X4 control module (if equipped) provides the IC with a message to turn on the powertrain malfunction (wrench) warning indicator.

If the ETC or transmission status message is missing or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the powertrain malfunction (wrench) warning indicator on. If equipped with AWD and the AWD status message is missing or invalid for more than 5 seconds, the IC sets DTC U0102 in continuous memory and defaults the powertrain malfunction (wrench) warning indicator on.

NOTE: If U0100 is set in the IC other symptoms may also be present such as an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- ETC concern
- Transmission concern
- AWD concern (if equipped)
- 4X4 control module (if equipped)
- PCM
- IC



PINPOINT TEST W: THE POWERTRAIN MALFUNCTION (WRENCH) WARNING INDICATOR IS NEVER/ALWAYS ON

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W1 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC powertrain malfunction (wrench) warning indicator (ETC_IND) active command and command the powertrain malfunction (wrench) warning indicator on and off. Observe the indicator.
- Does the powertrain malfunction (wrench) warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to W2.

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

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W2 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 PCM DTCs recorded?

Yes
For transmission related PCM DTCs, REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

For all other PCM DTCs, REFER to Computers and Control Systems Information.

No
If equipped with AWD, GO to W3.

If not equipped with AWD, GO to W4.

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W3 RETRIEVE THE RECORDED DTCs FROM THE 4X4 CONTROL MODULE SELF-TEST


- Check for recorded 4X4 control module DTCs from the self-test.
- Are any 4X4 control module DTCs recorded?

Yes
REFER to Transfer Case.

No
GO to W4.

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W4 CHECK THE IC TCM POWERTRAIN MALFUNCTION (WRENCH) REQUEST


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select and monitor the IC Transmission Control Module (TCM) powertrain malfunction (wrench) request PID (WR_LMP_TCM).
- Does the TCM wrench request PID read YES?

Yes
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.

No
GO to W5.

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W5 CHECK THE IC ETC POWERTRAIN MALFUNCTION (WRENCH) REQUEST PID


- Enter the following diagnostic mode on the scan tool: IC PID.
- Select and monitor the IC ETC powertrain malfunction (wrench) request PID (WR_LMP_ETC).
- Does the ETC wrench request PID read YES?

Yes
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.

No
If equipped with AWD, GO to W6.

If not equipped with AWD, INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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W6 CHECK THE IC 4X4 CONTROL MODULE POWERTRAIN MALFUNCTION (WRENCH) REQUEST PID


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select and monitor the IC 4X4 control module powertrain malfunction (wrench) request PID (WR_LMP_4X4M).
- Does the 4X4 control module powertrain malfunction (wrench) request PID read YES?

Yes
INSTALL a new 4X4 control module. REFER to Transfer Case. TEST the system for normal operation.

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

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