W T E C I I I E L E C T R O N I C C O N T R O L S T R O U B L E S H O O T I N G M A N U A L
When an ECU with a version 8 calibration(CIN=0A...) is used with a Trans ID 2 transmission, 33 XX
codes are set because the ECU does not have the proper calibrations for the TID 2 thermistors.
The ECU calibration must be updated to version 8A or later (CIN=0B...).
Main code 33 indicates the sump temperature sensor is providing a signal outside the usable range of the ECU.
This code indicates the sensor failed showing abnormally high or low temperature readings. Main code 33 can be
caused by a component or circuit failure or by extremely high or low temperatures. There are no operational
inhibits related to main code 33. The ECU assumes a hardware failure and that transmission temperatures are
normal (93ºC; 200ºF). Temperatures above or below normal cause poor shift quality.
Codeþ33 23 in conjunction with code 21þ23 indicates the loss of common ground (wire 135) between
the throttle and temperature sensors.
Active Indicator Clearing Procedure:
Before troubleshooting, read Paragraph 56. Also, check the transmission fluid level.
Code 33 12 can be caused when the +5V power line (wire 124) is shorted to ground or open. Wire 124
also provides power for the OLS, TPS, RMR, retarder temperature sensor, and shift selectors and is
present in all three ECU connectors.
1. If possible, check the sump temperature with a DDR. Use the fastest sample rate available on the
DDR. This is necessary to catch momentary changes due to an intermittent open or short to
ground. If a DDR is not available, use the shift selector display to determine if the code is active
(refer to Paragraph 52). Disconnect the transmission T harness at the ECU and check resistance
of the sensor and compare with Figure 612 for TID 1 for TID 2 .
2. If Step (1) reveals that the extreme temperature indication is no longer present, the temperature
limit could have been reached due to operational or ambient temperature extremes. Also, you may
be experiencing an intermittent problem and the code will not be active. Proceed cautiously, it is
unlikely there is a sensor hardware fault.
Sump oil temperature sensor failed low
Sump oil temperature sensor failed high
CODE 33 XX SUMP OIL TEMPERATURE SENSOR (Figure 511)