Pinpoint Tests AA: The Powertrain Malfunction (Wrench) Message Center Warning Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AA: The Powertrain Malfunction (Wrench) Message Center Warning Indicator Is Never/Always On
Normal Operation
The Instrument Cluster (IC) receives the powertrain malfunction (wrench) status from the PCM for the Electronic Throttle Control (ETC) and transmission status (4R70E/4R75E transmission), the Transmission Control Module (TCM) for the transmission status (6R80 transmission) and from the 4X4 control module for the Four-Wheel Drive (4WD) system status the over the High Speed Controller Area Network (HS-CAN) communication bus.
When a fault condition exists in the ETC system or in the transmission (4R70E/4R75E transmission), the PCM provides the IC with a message to turn the powertrain malfunction (wrench) warning indicator on. When a fault condition exists in the transmission (6R80 transmission), the TCM provides the IC with a message to turn the powertrain malfunction (wrench) warning indicator on. When a fault condition exists in the 4WD system, the 4X4 control module provides the IC with a message to turn the powertrain malfunction (wrench) warning indicator on.
If the ETC, transmission, or 4WD message is missing for less than 5 seconds, the IC defaults the powertrain malfunction (wrench) indicator to the last on/off state, based upon the last known good message received.
If the ETC or transmission (4R70E/4R75E transmission) message is missing for greater than 5 seconds, the IC sets DTC U0100 and defaults the powertrain malfunction (wrench) warning indicator on.
If the transmission message (6R80 transmission) is missing for greater than 5 seconds, the IC sets DTC U0101 and defaults the powertrain malfunction (wrench) warning indicator on.
If the 4WD message is missing for greater than 5 seconds, the IC sets DTC U0102 and defaults the powertrain malfunction (wrench) message center warning indicator on.
NOTE: If U0100 is set in the IC other symptoms may also be present such as an inoperative speedometer, tachometer or temperature gauge.
This pinpoint test is intended to diagnose the following:
- ETC concern
- Transmission concern
- 4WD concern
PINPOINT TEST AA: THE POWERTRAIN MALFUNCTION (WRENCH) MESSAGE CENTER WARNING INDICATOR IS NEVER/ALWAYS ON
