Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information
998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition




The transmission control module (TCM) calculates the ratio between the torque converter input speed (engine speed RPM) and the transmission speed after the torque converter. Diagnostic trouble code (DTC) AT-341 is stored if the control module registers a difference of more than 100rpm between the engine speed (RPM) and transmission speed, despite lock-up function being activated.

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

Possible source
- Contact resistance in terminals
- Mechanical fault in the transmission.

Fault symptom[s]
- The combined instrument panel warning lamp flashes.
- Mechanical malfunction. Faults are usually indicated by noise or other obvious function problems.
- No lock-up function.
- No adaptation of the gear slippage times at high altitude (High Altitude Compensation).

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