DTC 235
EBA. Code 2-3-5
2-3-5 Oil temperature too high
DTC information
Conditions for DTC
The oil temperature sensor sends a signal to the transmission control module (TCM) which is used for various functions, such as temperature controlled lock-up and initiation of high-temperature programs. The sensor has a temperature sensitive resistance of the NTC (negative temperature coefficient) type. The signal (resistance) sinks proportionate to the rise in the oil temperature. If the TCM receives a signal from the oil temperature sensor which is interpreted as being higher than approx. +150°C (302°F), the DTC 2-3-5 is set.
Substitution value
None.
Defect cause
- Short circuit to ground in the signal wiring.
- Malfunction in the oil temperature sensor.
- Mechanical fault in the transmission
- The transmission has been exposed extreme loads and high ambient temperatures.
Fault symptom
- The warning light flashes when the DTC is set and stops flashing when the TCM receives a signal that the oil temperature has fallen below approx +140°C (280°F).
NOTE: If it is likely the oil temperature in the transmission has exceeded approx +1 50°C (302°F) the oil must be changed.
- Fault-tracing starts with EBA1.
EBA1
Other DTCS.
- Read off other DTCs
If DTC 1-4-1 is stored:
- Fault-tracing as per EAM. DTC 1-4-1, Short circuit in the oil temperature sensor circuit.
If DTC 1-4-1 is not stored:
- Checking oil temperature EBA2.
EBA2
Checking oil temperature.
- Ignition ON.
- Set gearshift selector to position P.
Check whether the transmission oil temperature is apparently correct by using Diagnostic Test Mode 5. Diagnostic Test Mode 5 Compare with the transmission temperature.
Ambient temperature approx. +20 °C (68 °F). Engine idling for 15 min in workshop, approx. +40 °C (104 °F). Driving on freeway for 30 min at ambient temperature above +15 °C (59 °F), approx. +80 °C (176 °F).
If the oil temperature is reasonable:
- Checking wiring and connections EBA5.
If the oil temperature is unreasonable:
- Checking signal wiring on the oil temperature sensor EBA3.
EBA3
Checking signal wiring on oil temperature sensor
- Ignition OFF
- Remove the air cleaner (ACL) housing to access the transmission connector
- Disconnect the transmission connector
Connect an ohmmeter between the transmission connector terminal 12 (transmission side) and the transmission housing.
The ohmmeter should read infinite resistance.
If reading is OK:
- Checking oil temperature sensor resistance EBA4.
If reading is incorrect:
- Check the cable between the oil temperature sensor and transmission connector terminal 12 for short circuit to ground as per FA3. FA. Checking Wiring and Connections
If the cable is OK: Try a new oil temperature sensor as per Z1-Z12.
EBA4
Checking oil temperature sensor resistance
- Ignition OFF
- Disconnect transmission connector
Connect an ohmmeter between the transmission connector terminals 12 and 13 (transmission side).
The reading should be approx. 765-1035 Ohms at +20°C (68°F) (see table).
If reading is OK:
- Check the cable between the transmission connector terminal 12 and the TCM #A14 for short circuit to ground as per FA3. FA. Checking Wiring and Connections
If reading is incorrect:
- Try a new oil temperature sensor as per Z1-Z12.
EBA5
Checking wiring and connections
- Check the cable between the oil temperature sensor and TCM #A14 for intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections
Then continue with: Checking the transmission EBA6.
EBA6
Checking the transmission
- Ignition OFF
- Reinstall the transmission connector and the air cleaner ACL housing
Test drive the car according to the Test Drive Form to check that it is free from mechanical defects. Test Aide Drive Form
If the transmission is OK:
- Change the transmission oil as per Oil, change J1-J7.
If there are indications that the transmission is malfunctioning:
- See diagnostic code 1-1-1 for symptoms and procedures. If the transmission oil is not changed when corrective action is taken the oil must be changed as per Oil, change J1-J7.