DTC 66-12: Pressure Sensor (Inside of VSA Modulator-Control Unit) Malfunction

WARNING: This page is about a different car, the 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. (See General Troubleshooting Information ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
Check for DTCs with the HDS.
Is DTC 66-12 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see Intermittent Failures ).
Turn the ignition switch to LOCK (0).
Disconnect the steering angle sensor 5P connector (see STEERING ANGLE SENSOR REPLACEMENT ).
Disconnect the VSA modulator-control unit 36P connector (see step 3 ).
Check for continuity between steering angle sensor 5P connector terminal No. 5 and body ground.

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

Is there continuity?

YES - Repair short to body ground in the wire between the steering angle sensor and the VSA modulator-control unit.

NO - Go to step 9.
Turn the ignition switch to ON (II).
Measure the voltage between steering angle sensor 5P connector terminal No. 5 and body ground.

Fig 2: Measuring Voltage Between Steering Angle Sensor 5P Connector Terminal No. 5 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 0.1 V or more?

YES - Repair short to power in the wire between the steering angle sensor and the VSA modulator-control unit.

NO - Go to step 11.
Turn the ignition switch to LOCK (0).
Check for continuity between VSA modulator-control unit 36P connector terminal No. 9 and steering angle sensor 5P connector terminal No. 5.

Fig 3: Checking Continuity Between VSA Modulator-Control Unit 36P & Steering Angle Sensor 5P Connectors Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 13.

NO - Repair open in the wire between the steering angle sensor and the VSA modulator-control unit.
Reconnect all connectors.
Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ).
Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
Check for DTCs with the HDS.
Is DTC 66-12 indicated?

YES - Check for loose terminals in the VSA modulator-control unit 36P connector. If the symptom/indication is still present, replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

NO - If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.