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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The PCM, the Transmission Control Module (TCM) and the 4X4 control module (if equipped) monitor the powertrain system and provide the Instrument Cluster (IC) with the operating status over the communication network. When a system concern is detected, the PCM, the TCM or the 4X4 control module provide the IC with a signal commanding the IC to illuminate the powertrain malfunction (wrench) warning indicator.

This pinpoint test is intended to diagnose the following:

- TCM
- PCM
- 4X4 control module (if equipped)
- IC



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

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U1 OBSERVE THE INDICATOR


- Ignition ON.
- Start the vehicle. Observe the powertrain malfunction (wrench) warning indicator.
- Does the powertrain malfunction (wrench) indicator illuminate during the bulb prove-out?

Yes
GO to U2.

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

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U2 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
REFER to Computers and Control Systems Information to continue diagnosis of the DTCs.

No
GO to U3.

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U3 RETRIEVE THE RECORDED DTCs FROM THE TCM SELF-TEST


- Check for recorded TCM DTCs from the continuous and on-demand self-tests.
- Are any TCM DTCs recorded?

Yes
REFER to Transmission Control Systems. Testing and Inspection

No
If equipped with AWD, GO to U4.

If not equipped with AWD, GO to U5.

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U4 RETRIEVE THE RECORDED DTCs FROM THE 4X4 CONTROL MODULE SELF-TEST


- Check for recorded 4X4 control module DTCs from the continuous and on-demand self-tests.
- Are any 4X4 control module DTCs recorded?

Yes
REFER to Transfer Case. Testing and Inspection

No
GO to U5.

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U5 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) indicator (ETC_IND) active command. Command the powertrain malfunction (wrench) warning indicator active command 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 U6.

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

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U6 CHECK THE IC TCM WRENCH REQUEST PID


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select and monitor the IC TCM wrench request PID (WR_LMP_TCM).
- Does the TCM wrench request PID read YES?

Yes
INSTALL a new TCM. TEST the system for normal operation.

No
GO to U7.

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U7 CHECK THE IC ELECTRONIC THROTTLE CONTROL WRENCH REQUEST PID


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select and monitor the IC electronic throttle control wrench request PID (WR_LMP_ETC).
- Does the electronic throttle control wrench request PID read YES?

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

No
If equipped with Four-Wheel Drive (4WD), GO to U8.

If not equipped with 4WD, INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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U8 CHECK THE IC 4X4 CONTROL MODULE WRENCH REQUEST PID


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

Yes
INSTALL a new 4X4 control module. 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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