DTC 235

EK. DTC 2-3-5
2-3-5 High fluid temperature

Principle of operation

The sensor supplies a signal which is used for many functions, such as temperature-control- led lock-up and activation of high-temperature programs. The sensor is of a type whose resistance varies with temperature.

Fault description

The DTC is recorded if the fluid temperature exceeds 150°C (302° F). The MIL on the combined instrument lights when the temperature exceeds this value and goes out when the temperature falls below 140°C (284°F).

The DTC may be recorded either if the temperature actually becomes high and if the sensor is faulty. If the temperature has increased beyond 150°C (302°F), the fluid must be changed and the transmission checked to ensure that mechanical damage has not occurred. Also check the conditions under which the car has been driven.





Circuit description

The circuit consists of the TCM, three connectors and the fluid temperature sensor on the transmission.





1
Checking fluid temperature

Check in test mode 5 that indicated fluid temperature is reasonable. Displaying & Reading Trouble Codes

If using the DLC manually, see response code conversion table in for test mode 5.





2
Measuring resistance of fluid temperature sensor and leads

- Switch off ignition.
- Connect break-out box to wiring.





Connect ohmmeter between # 6 (OT) and # 7 (OTG).

- If instrument reading is in accordance with tabulated values, sensor and leads are OK.

DTC is due to intermittent fault or excessively high fluid temperature. Check or replace fluid then return to Testing and Inspection. Diagnostic Procedures

- If instrument indicates other value, proceed to next step.





3
Measuring resistance of fluid temperature sensor

- Switch off ignition.
- Measure at connector D on transmission (solenoid side).

Connect ohmmeter between terminal 3 (OT) and 4 (OTG).

- If instrument indicates value other than tabulated value, sensor is faulty. Replace sensor.
- If instrument indicates value as per table, sensor is OK.

Check leads for open-circuit and short-circuit to ground, and for poor connections as described in Testing and Inspection. Component Tests and General Diagnostics

If fluid has been overheated, it must be changed.

Return to Testing and Inspection. Diagnostic Procedures