ECPS indicator does not go off after the engine is started

NOTE: High engine speed (1,700 RPM or above) when the vehicle is not moving may cause the ECPS indicator to come on.

Disconnect the ECPS control unit 12P connector.
Turn the ignition switch ON (II).
Measure the voltage between ECPS control unit 12P connector terminal No. 8 and body ground.

Fig 1: Measuring Voltage Between ECPS Control Unit 12P Connector Terminal No. 8 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Fig 2: Connecting ECPS Control Unit 12P Connector Terminal No. 8 And Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the ECPS indicator go off?

YES - Go to step 5.

NO - Do the troubleshooting for the gauge control module (see GAUGE CONTROL MODULE INPUT TEST ).
Disconnect the jumper wire.
Measure the voltage between body ground and ECPS control unit 12P connector terminal No. 7.

Fig 3: Measuring Voltage Between Body Ground And ECPS Control Unit 12P Connector Terminal No. 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 fuse/relay box.
Check for voltage between body ground and the ECPS control unit 12P connector terminal No. 9.

Fig 4: Checking Voltage Between Body Ground And ECPS Control Unit 12P Connector Terminal No. 9
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Fig 5: Checking Resistance Between ECPS Control Unit 12P Connector Terminals No. 2 And No. 5, No. 6, No. 11, And No. 12
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance between 19.8 to 24.2 Ω (at 20°C, 68°F)?

YES - Go to step 9.

NO - Check for and repair open/short in the wires between the ECPS control unit 12P connector and the stepping valve motor. If the wires are OK, the ECPS valve is faulty; replace the ECPS valve.
Start the engine.
Measure the voltage between ECPS control unit 12P connector terminal No. 4 and body ground.

Fig 6: Measuring Voltage Between ECPS Control Unit 12P Connector Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 (see ECPS CONTROL UNIT REMOVAL/INSTALLATION ).

NO - Repair open in the GRN wire between the ECPS control unit and PCM connector A.