DTC 113

DC. DTC 1-1-3
1-1-3 TCM fault

Principle of operation

The TCM controls transmission operation in response to a number of sensor signals and with the aid of a computer program, using solenoid valves connected to outputs on the TCM. The outputs also incorporate power stages. The figure below shows the components with which the TCM communicates.

Fault description

A short-circuit has occurred at some point in the solenoid S2 circuit, preventing the solenoid from performing gearshifting. The emergency limp-home program is activated and the transmission operates only in 4th gear. The MIL on the panel lights
Troubleshooting will indicate if the TCM is faulty.





Circuit description

The circuit consists of the TCM, three connectors and solenoid S2 in the transmission.





1
Checking TCM supply voltage

- Switch off ignition.
- Connect break-out box between TCM and wiring.
- Switch on ignition.

Supply voltage between ignition switch and power ground

Measure voltage across # 14 (+12 V) and # 11 (PG).

- Instrument should indicate battery voltage.

Supply voltage battery and signal ground

Measure voltage across # 30 (+12 V) and # 12 (SG).

- Instrument should indicate battery voltage.

If either reading is incorrect, check leads in question as described in Testing and Inspection. Component Tests and General Diagnostics

Proceed to following step.

2
Checking ground terminals

- Switch on ignition.

Measure voltage across # 11 (PG) and # 12 (SG).

- Instrument should indicate less than 0.7 V. If not, terminal connections are poor. In this event, check ground leads and connections as described in Testing and Inspection. Component Tests and General Diagnostics

It readings are correct, return to Testing and Inspection. Diagnostic Procedures

If DTC recurs after test drive, try with new TCM.