Pinpoint Test O: Incorrect Transmission Temperature Gauge Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test O: Incorrect Transmission Temperature Gauge Indication
Normal Operation
The transmission temperature gauge requires both transmission temperature and engine rpm data to operate the transmission temperature gauge. The Instrument Cluster (IC) receives the transmission temperature and the engine rpm data from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the IC receives the transmission temperature data along with an engine rpm status over 500 rpm, the IC commands the transmission temperature gauge with a corresponding movement of the pointer.
If the IC does not receive the transmission temperature or engine rpm data from the PCM for 5 seconds or less, the IC defaults the transmission temperature gauge to the last setting, based upon the last known good rpm message. If the IC does not receive the transmission temperature or engine rpm data from the PCM or Transmission Control Module (TCM) for more than 5 seconds, the IC sets DTC U0100 (gasoline) or DTC U0101 (diesel) in continuous memory and defaults the transmission temperature gauge to the cold (C) stop position. If the transmission temperature or engine rpm data is deemed invalid by the IC, the IC sets DTC U2023 and defaults the tachometer to the cold (C) stop position.
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, temperature gauge or tachometer.
This pinpoint test is intended to diagnose the following:
- IC
PINPOINT TEST O: INCORRECT TRANSMISSION TEMPERATURE GAUGE INDICATION
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O1 RETRIEVE THE RECORDED DTCs FROM THE PCM AND TCM KOEO SELF-TEST
- Check the recorded PCM and TCM DTCs from the self-test.
- Are any DTCs recorded?
Yes
For PCM DTCs, REFER to Computers and Control Systems Information.
For TCM DTCs, REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.
No
GO to O2.
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O2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Check for recorded IC DTCs from the self-test.
- Are any DTCs recorded?
Yes
For DTC U0100 (gasoline), GO to Pinpoint Test BD. Pinpoint Tests BD: DTC U0100
For DTC U0101 (diesel), GO to Pinpoint Test BE. Pinpoint Tests BE: DTC U0101
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to O3.
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O3 CHECK THE TCM TEMPERATURE PID
NOTE: This step may require the use of an assistant to monitor the transmission temperature PID and the transmission temperature gauge indication.
- Enter the following diagnostic mode on the scan tool: TCM DataLogger .
- Ignition ON.
- NOTE: The transmission temperature should range between -40 to 49°C (-40 to 120°F) with the gauge in the cold (C) range, between 10 to 120°C (120 to 248°F) with the gauge in the normal or mid-range and above 135 to 214°C (275 to 417°F) with the gauge in the hot (H) range.
- Select the TCM transmission temperature gauge PID (TFT).
- Beginning with a cold transmission, drive the vehicle while monitoring the TCM transmission temperature PID.
- Does the TCM PID agree with the position of the transmission temperature gauge indication at different temperature ranges?
Yes
The transmission temperature gauge is operating correctly at this time. 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. TEST the system for normal operation.
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