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
Figure 512. Temperature Sensor Chart
3. Disconnect the external harness at the transmission. Check the connectors and terminals for dirt,
corrosion, or damage. Clean or replace as necessary.
4. Check the sensor wires in the external harness for opens (code 33 23), shorts between wires, or
shorts-to-ground (code 33 12 refer to Section 4). If wiring problems are found, isolate and re-
5. If no harness problems are found, check the feedthrough harness for damage. If the feedthrough
harness connector is satisfactory, drain the fluid and remove the control module. Check for chafing
of the sensor wires, especially near the separator plate. Eliminate the chafe point. If no chafe point
is found, replace the sensor.
6. If the problem recurs, use a spare wire, if available, or provide a new wire (St. Clair P/N 200153
may be used for this purpose) for the temperature sensor circuit.
7. If the condition persists, replace the ECU. If replacing the ECU corrects the problem, reinstall the
original (bad) ECU to confirm that the problem is in the ECU. If the original ECU now works, in-
spect the ECU connectors for any corrosion or damage which may cause an intermittent condition.
If the original problem recurs, reinstall the replacement ECU.
CODE 33 XX SUMP OIL TEMPERATURE SENSOR (Figure 511)