Pinpoint Test L: The Transmission Temperature Gauge Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Test L: The Transmission Temperature Gauge Is Inoperative

Normal Operation

The Instrument Panel Cluster (IPC) receives the transmission temperature data from the PCM (gasoline engines) or Transmission Control Module (TCM) (diesel engine) over the High Speed Controller Area Network (HS-CAN) communication bus. When the IPC (Instrument Panel Cluster) receives the transmission temperature data, the IPC (Instrument Panel Cluster) commands the transmission temperature gauge with a corresponding movement of the pointer. The PCM or TCM (Transmission Control Module) filters the transmission temperature input and sends the filtered data to the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) then further dampens the temperature data to eliminate minor fluctuations in the gauge indication.

If the transmission temperature data is missing or invalid from the PCM or TCM (Transmission Control Module) for 5 seconds or less, the IPC (Instrument Panel Cluster) defaults the transmission temperature gauge to the last setting, based upon the last known good message received. If the IPC (Instrument Panel Cluster) does not receive the transmission temperature data from the PCM or TCM (Transmission Control Module) for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0101:00 in continuous memory and defaults the transmission temperature gauge to the cold (C) stop position. If the transmission temperature data is deemed invalid by the IPC (Instrument Panel Cluster) for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0402:00 and defaults the transmission temperature gauge to the cold (C) stop position.

NOTE: If DTC U0101:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms may be the powertrain malfunction (wrench) warning indicator always on.

This pinpoint test is intended to diagnose the following:

- PCM (gasoline engines)

- TCM (Transmission Control Module) (diesel engine)

- IPC (Instrument Panel Cluster)

PINPOINT TEST L : THE TRANSMISSION TEMPERATURE GAUGE IS INOPERATIVE

L1 RETRIEVE THE RECORDED DTCs FROM THE TCM (Transmission Control Module) OR PCM KOEO (Key ON Engine OFF) SELF-TEST

- Check the recorded TCM (Transmission Control Module) OR PCM DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

No
GO to L2.

L2 CARRY OUT THE TRANSMISSION TEMPERATURE GAUGE ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) transmission temperature gauge (TRANS_TEMP) active command. Command the transmission temperature gauge on and off while monitoring the transmission temperature gauge.

Does the transmission temperature gauge move to hot (H) and return to cold (C)?

Yes
GO to L3.

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

L3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0101:00, GO to Pinpoint Test BB. Pinpoint Test BB: DTC U0101:00

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
For gasoline engines, INSTALL a new PCM. TEST the system for normal operation.

For diesel engine, INSTALL a new TCM (Transmission Control Module). TEST the system for normal operation.