Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition




Torque from the engine is reduced during some gear shifts to allow smoother gear shifting and to minimize transmission wear. This process is controlled by a torque limiting signal transmitted from the transmission control module (TCM) to the engine control module (ECM) via a cable. This cable is also used to inform the engine control module (ECM) which position the gear selector is in. This is so the engine control module (ECM) can adjust the engine speed (RPM) when a gear is engaged (R/D/3/L).
In position P/N the signal is approximately 5 V and in positions R/D/3/L the signal is almost 0 V. When the transmission control module (TCM) requests torque limiting when shifting the control module raises the voltage to approximately 5 V for a short period of time (short pulses).
Diagnostic trouble code (DTC) AT-243 is stored after approximately 7.5 seconds if the transmission control module (TCM) detects that the signal is low when it should be high (position P/N).

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

Possible source
- Open-circuit in the signal cable.
- Short-circuit to ground in the signal cable.
- Contact resistance in the terminals.

Note! The diagnostic trouble code (DTC) is also stored if the engine control module (ECM) is disconnected and the ignition is switched on. Fault causes of this type are not included in the fault-tracing procedure.

Fault symptom[s]
- The warning lamp in the combined instrument panel flashes.
- No lock-up function.
- No adaptation of the gear slippage times at high altitude (High Altitude Compensation).
- No reduction of line pressure when gear shifting. This makes gear shifting harsher.
- No reduction of line pressure when moving the gear selector between positions P-R, N-R and N-D. This results in harsh shifting.
- No torque limiting request to the engine control module (ECM) when gear shifting, gives harsher gear shifting.