Starter Switch Signal Circuit Troubleshooting

NOTE:

Measure voltage between ECM/PCM connector terminals A24 and B20 with the ignition switch in the start position (III).

Fig 1: Measuring Voltage Between ECM/PCM Connector Terminals A24 & B20
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - The starter switch signal is OK.
2. NO - Go to step 2.
Inspect the No. 13 STARTER SIGNAL (7.5 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?
1. YES - Repair open in the wire between the ECM/PCM (A24) and the No. 13 STARTER SIGNAL (7.5 A) fuse.
2. NO - Repair short in the wire between the ECM/PCM (A24) and the No. 13 STARTER SIGNAL (7.5 A) fuse or the PGM-FI main relay. Replace the No. 13 STARTER SIGNAL (7.5 A) fuse.