F-CAN Circuit Troubleshooting

Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM connector E (31P).
Disconnect the HDS from the DLC.
Measure the resistance between ECM connector terminals E11 and E24.

Fig 1: Measuring Resistance Between ECM Connector Terminals E11 And E24
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 108-132 Ω?

YES -Go to step 16.

NO -Go to step 6.
Disconnect the VSA modulator-control unit 47P connector (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).
Disconnect the steering angle sensor 5P connector.
Check for continuity between ECM connector terminal E11 and E24.

Fig 2: Checking Continuity Between ECM Connector Terminal E11 And E24
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wires between the ECM connector terminals E11 and E24.

NO -Go to step 9.
Connect ECM connector terminal E11 to body ground with a jumper wire.

Fig 3: Connecting ECM Connector Terminal E11 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between VSA modulator-control unit 47P connector terminal No. 11 and body ground.

Fig 4: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal 11 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 11.

NO -Repair open in the wire between the ECM (Ell) and the VSA modulator-control unit.
Check for continuity between steering angle sensor 5P connector terminal No. 4 and body ground.

Fig 5: Checking Continuity Between Steering Angle Sensor 5P Connector Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 12.

NO -Repair open in the wire between the ECM (E11) and the steering angle sensor.
Remove the jumper wire from ECM connector E (31P).
Connect ECM connector terminal E24 to body ground with a jumper wire.

Fig 6: Connecting ECM Connector Terminal E24 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between VSA modulator-control unit 47P connector terminal No. 15 and body ground.

Fig 7: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 15 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 15.

NO -Repair open in the wire between the ECM (E24) and the VSA modulator-control unit.
Check for continuity between steering angle sensor 5P connector terminal No. 2 and body ground.

Fig 8: Checking Continuity Between Steering Angle Sensor 5P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

NO -Repair open in the wire between the ECM (E24) and the steering angle sensor.
Disconnect the VSA modulator-control unit 47P connector.
Disconnect the steering angle sensor 5P connector.
Check for continuity between ECM connector terminal E11 and body ground.

Fig 9: Checking Continuity Between ECM Connector Terminal E11 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between ECM connector terminal E11 and the VSA modulator-control unit, the steering angle sensor, or the DLC.

NO -Go to step 19.
Check for continuity between ECM connector terminal E24 and body ground.

Fig 10: Checking Continuity Between ECM Connector Terminal E24 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between ECM connector terminal E24 and the VSA modulator-control unit, the steering angle sensor, or the DLC.

NO -Go to step 20.
Check for continuity between VSA modulator-control unit 47P connector terminal No. 47 and body ground.

Fig 11: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 47 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 21.

NO -Repair open in the wire between the VSA modulator-control unit (No. 47) and body ground (G303).
Check for continuity between steering angle sensor 5P connector terminal No. 1 and body ground.

Fig 12: Checking Continuity Between Steering Angle Sensor 5P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 22.

NO -Repair open in the wire between the steering angle sensor (No. 1) and body ground (G401).
Reconnect the VSA modulator-control unit 47P connector.
Connect the HDS (see HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?

YES -Replace the steering angle sensor (see STEERING ANGLE SENSOR REPLACEMENT .

NO -Go to step 25.
Substitute a known-good ECM (see SUBSTITUTING THE ECM ).
Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?

YES -The system is OK at this time. Replace the original ECM (see ECM REPLACEMENT ).

NO -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).