W/Harness Inspection

Engine

Engine Control - P0651 Sensor Reference Voltage B Circuit/Open - W/Harness Inspection

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
> Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Go to "Power Circuit Inspection" procedure.

Power Supply Circuit Inspection

Check voltage
1. IG "OFF" and disconnect ETC Motor & TPS connector.
2. IG "ON" and ENG "OFF"
3. Measure voltage between TPS 2 power terminal of ETC Motor & TPS harness connector and chassis ground.
A. Specification : Approx. 5 V




4. Is the measured voltage within specification?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Check short in harness" as follows.
Check short in power harness
1. IG "OFF".
2. Disconnect ETC Motor & TPS connector and PCM connector.
3. Measure the resistance between TPS 2 power and ETC motor (+) terminals of ETC Motor & TPS harness connector. (Measurement "A")
4. Measure the resistance between TPS 2 power and ETC motor (-) terminals of ETC Motor & TPS harness connector. (Measurement "A")
5. Measure the resistance between TPS 2 power and TPS 1 ground terminals of ETC Motor & TPS harness connector. (Measurement "B")
6. Measure the resistance between TPS 2 power and TPS 2 ground terminals of ETC Motor & TPS harness connector. (Measurement "B")
A. Specification : Infinite








7. Is the measured resistance within specification?
YES
1) Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO
1) Repair Short in power harness and go to "Verification of Vehicle Repair" procedure.

CAUTION:
** Procedure of ETS Initialization
1. Erase the trouble codes on PCM
2. Turn the ignition key off and keep this condition until the main relay is turned off. (It will take 10 seconds)
3. Turn ignition key on more than 1 second to record the throttle motor position on the EEPROM