Trouble Code Conditions

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

CONDITION
The Throttle Position (TP) sensor signal comes from the throttle position sensor on the Throttle Body (TB) via the Engine Control Module (ECM). This signal indicates to the Transmission Control Module (TCM) how far the throttle has opened. The TCM uses the signal to control functions such as gearshifting and system pressure. The signal normally varies between approx. 0.5 and approx. 4.2 V. Opening the throttle increases the signal voltage. Diagnostic Trouble Code (DTC) AT-223 is posted if the TCM registers a signal below 0.1 V for approx. 10 seconds.

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

POSSIBLE SOURCE
- Open-circuit in signal cable
- Short-circuit to ground in signa: cable.
- Contact resistance in terminals
- Fault in throttle position sensor circuit.

FAULT SYMPTOM(S)
- The combined instrument panel warning lamp flashes.
- No lock-up function.
- No adaption of the gear slippage times at high altitude (High Altitude Compensation)
- Gear-shifting operation can change - irregular shifting.

NOTE:
- The Motronic 4.4 ECM posts a DTC when the transmission sends a Malfunction Indicator Lamp (MIL) request.
- Erase this DTC in the Motronic ECM when the transmission fault has been repaired.

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