DTC 45: Fuel System Malfunction NOTE: If some of the DTCs listed below are stored at the same time as DTC 45, troubleshoot those DTCs first, then recheck for DTC 45. DTC 3: MAP Sensor DTC 41: Primary HO2S (Sensor 1) Heater DTC 63: Secondary (Sensor 2) HO2S DTC 65: Secondary HO2S (Sensor 2) Heater DTC 12: EGR System DTC 22: VTEC System Recheck the fuel pressure (see page 11-132). Is fuel pressure OK? YES - Go to step 2. NO - Check these items: If the pressure is too high. Check the fuel pressure regulator. If the pressure is too low. Check the fuel pump, the fuel feed pipe, the fuel filter, and the fuel pressure regulator. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on. Measure voltage between ECM/PCM connector terminals A6 and A24. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Does it stay at less than 0.3 V or more than 0.6 V? YES - Replace the primary HO2S (Sensor 1). NO - Go to step 4. Turn the ignition switch OFF.

With a vacuum pump, apply vacuum to the EVAP canister purge valve from the intake manifold side. Does it hold vacuum? YES - Go to step 6. NO - Replace the EVAP canister purge valve. Turn the ignition switch ON (II). Measure voltage between ECM/PCM connector terminals A11 and A19. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there approx. 3 V? YES - Go to step 8. NO - Replace the MAP sensor. Start the engine. Measure voltage between ECM/PCM connector terminals A11 and A19. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there 1.5 V or less within 1 second after starting the engine? YES - Check the valve clearance and adjust if necessary. If the valve clearances are OK, replace the injector. NO - Replace the MAP sensor.