P0641

P0641

Component Location:

General Description
The TCM monitors voltage supply to solenoid valve.

DTC Description
The TCM sets this code when suppling voltage to TCM is lower or higher than specification.

DTC Detecting Condition:

Monitor Scantool Data
1. Connect scantool to data link Connector (DLC)
2. Ignition "ON" & Engine "OFF".
3. Monitor the "BATTERY VOLTAGE and A/T MAIN RELAY VOLTAGE" parameter on the scantool

Specification : approx. 12 V






4. Does "BATTERY VOLTAGE and A/T MAIN RELAY VOLTAGE" follow the reference data?

YES
a. Fault is intermittent caused by poor contact in the sensor's and/or PCM/TCM's connector or was repaired and PCM/TCM memory was not cleared. Throughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO
a. Go to "W/Harness Inspection" procedure

Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES
a. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO
a. Go to "Power Circuit Inspection" procedure.

Power Supply Circuit Inspection
1. IG "ON" Engine "OFF".
2. Disconnect the "PCM/TCM" connector
3. Measure voltage between terminal No "29" of TCM harness connector and chassis ground and then terminal No "73" of the TCM harness connector and chassis ground.

Specification : approx. 12 V






4. Is voltage within specifications?

YES
a. Fault is intermittent caused by poor contact in the sensor's and/or PCM/TCM's connector or was repaired and PCM/TCM memory was not cleared.And go to Verification of Vehicle Repair procedure.

NO
a. Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM as necessary and then go to "Verification of Vehicle Repair" procedure.

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present?

YES
a. Go to the applicable troubleshooting procedure.

NO
a. System performing to specification at this time.