DTC 112-01: Central Processing Unit (CPU) Internal Circuit Malfunction

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Turn the ignition switch OFF.
Disconnect the VSA modulator-control unit 37P connector.
Measure voltage between VSA modulator-control unit 37P connector terminal No. 13 and body ground.

Fig 1: Measuring Voltage Between VSA Modulator-Control Unit 37P Connector Terminal No. 13 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 6.

NO -Check the battery performance (see BATTERY ), and troubleshoot the alternator and regulator circuit (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING ).
Measure voltage between VSA modulator-control unit 37P connector terminal No. 28 and body ground.

Fig 2: Measuring Voltage Between VSA Modulator-Control Unit 37P Connector Terminal No. 28 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 0 V?

YES -Go to step 7.

NO -Repair short to power in the wire between the No. 4 (7.5 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.
Turn the ignition switch ON (II).
Measure voltage between VSA modulator-control unit 37P connector terminal No. 28 and body ground.

Fig 3: Measuring Voltage Between VSA Modulator-Control Unit 37P Connector Terminal No. 28 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Check for loose terminals in the VSA modulator-control unit 37P connector. If necessary, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), and retest.

NO -Repair open in the wire between the No. 4 (7.5 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.