ECPS Indicator Does Not Go Off After The Engine Is Started

ECPS indicator does not go off after the engine is started
1. Disconnect the ECPS control unit 12P connector.
2. Turn the ignition switch ON (II).
3. Measure the voltage between ECPS control unit 12P connector terminal No. 8 and body ground.





Is there about 5 V?
YES - Go to step 4.
NO - Repair open in the wire between the ECPS control unit and the gauge assembly module.

4. Connect ECPS control unit 12P connector terminal No. 8 and body ground with a jumper wire.





Does the ECPS indicator go off?
YES - Go to step 5.
NO - Do the troubleshooting for the gauge assembly module.

5. Disconnect the jumper wire.
6. Measure the voltage between body ground and ECPS control unit 12P connector terminal No. 7.





Is there battery voltage?
YES - Go to step 7.
NO - Repair open in the wire between the ECPS control unit 12P connector and the under-dash f use/relay box.

7. Check for voltage between body ground and the ECPS control unit 12P connector terminal No. 9.





Is there less than 0.1 V?
YES - Go to step 8.
NO - Repair open in the wire between the ECPS control unit 12P connector and body ground (G203).

8. Check for resistance between ECPS control unit 12P connector terminals No. 2 and No. 5, No. 6, No. 11, and No. 12 individually.





Is the resistance between 19.8 to 24.2 9 (at 20°C, 68°F)?
YES - Go to step 9.
NO - Check for and repair open in the wires between the ECPS control unit 12P connector and stepping valve motor. If the wires are OK, the ECPS valve is faulty; replace the ECPS valve.

9. Start the engine.
10. Measure the voltage between ECPS control unit 12P connector terminal No. 4 and body ground.





Is there about 5.0 V?
YES - Check for loose connector terminals in the ECPS control unit 12P connector and repair if necessary. If the terminals are OK, replace the ECPS control unit.
NO - Repair open in the GRN wire between the ECPS control unit and PCM connector A.