Measure voltage between ECM/PCM connector terminal B9 and body ground. ECM/PCM CONNECTOR B (24P) Wire side of female terminals Is there battery voltage? YES - Repair open in the wire between the VTEC oil pressure switch and ECM/PCM (B9). NO - Go to step 12. Turn the ignition switch OFF. Disconnect ECM/PCM connector B (24P). Check for continuity between ECM/PCM connector terminal B9 and body ground. ECM/PCM CONNECTOR B (24P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the VTEC oil pressure switch and the ECM/PCM (B9). NO - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. Measure voltage between the VTEC oil pressure switch 2P connector terminals No. 1 and No. 2.

VTEC OIL PRESSURE SWITCH HARNESS 2P CONNECTOR Wire side of female terminals Is there battery voltage? YES - Go to step 16. NO - Repair open in the wire between the VTEC oil pressure switch and G101. Turn the ignition switch OFF. Disconnect the VTEC solenoid valve 1P connector. Check for resistance between the VTEC solenoid valve 1P connector terminal No. 1 and body ground. VTEC SOLENOID VALVE 1P CONNECTOR Terminal side of male terminal Is there 14-30 ohms? YES - Go to step 19. NO - Replace the VTEC solenoid valve.