Trouble Code Conditions

SPECIAL TOOLS
Test box tool No. 981 3190, or equivalent
Volvo scan tool No. 998 8686, or equivalent

CONDITION
The Load Signal (TQ) from the Engine Control Module (ECM) provides the Transmission Control Module (TCM) with information about the torque being delivered by the engine. This signal also provides information about engine speed (rpm), and whether the engine is idling or if fuel is shut-off. Diagnostic Trouble Code (DTC) AT-134 is posted if the TCM does not register an incoming load signal when the transmission speed sensor signal indicates that input shaft speed is above 600 rpm after the torque converter.

SUBSTITUTE VALUE
The TCM "Emergency mode 1" program has been initiated.

POSSIBLE SOURCE
- Open-circuit in signal cable
- Short-circuit to supply voltage or ground in the signal cable
- Contact resistance in terminals

FAULT SYMPTOM(S)
- Combined instrument panel warning lamp flashes once when the fault is detected
- No lock-up function.
- No adaption of the gear slippage times at high altitude (High Altitude Compensation)

TESTING PROCEDURE
- Start fault-tracing at Faulty Signal. Faulty Signal