Trouble Code Conditions

Special Tools:
- 981 3190
- 998 8686

Trouble Code Conditions
- 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 transmission control module uses the signal to control functions such as gear-shifting and system pressure. The signal normally varies between approx. 0.5 and approx. 4.2 Volts. Opening the throttle increases the signal voltage. Diagnostic trouble code (DTC) AT-223 is stored if the transmission control module registers a signal below 0.1 Volts for approx. 10 seconds.

Substitute value(s)
- The transmission control module "Emergency mode I" program has been initiated.

Possible source(s)
- Open-circuit in signal cable.
- Short-circuit to ground in signal 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.

- The Motronic 4.4 engine control module posts a diagnostic trouble code when the transmission sends a malfunction indicator lamp (MIL) request. Erase this diagnostic trouble code in the Motronic engine control module when the transmission fault has been repaired.

- Start fault-tracing. Signal Too Low