Trouble Code Conditions

SPECIAL TOOLS
Volvo scan tool No. 998 8686, or equivalent

CONDITION
The oil temperature sensor sends a signal to the Transmission Control Module (TCM) which is used for functions such as temperature controlled lock-up and initiating high-temperature programs. The sensor has an NTC (negative temperature coefficient) resistor. The signal decreases in proportion to increasing oil temperature. Diagnostic trouble code (DTC) AT-141 is posted if the TCM receives a signal from the oil temperature sensor below 0.1 volts for 25 seconds.

SUBSTITUTE VALUE
No substitution value

POSSIBLE SOURCE
- Short-circuit to ground in signal cable.
- Defective oil temperature sensor.


FAULT SYMPTOM(S)
- The lock-up function may not work properly.

TESTING PROCEDURE
- Start fault-tracing at Signal too Low. Signal Too Low