General Pinpoint Test 7: Pcm Power Relay

PINPOINT TEST 7 - PCM POWER RELAY

PINPOINT TEST 7		POSITIVE CRANKCASE VENTILATION PCV SYSTEM
STEP	INSPECTION		ACTION
1	CHECK VPWR CIRCUIT RESISTANCE Idle Air Control (IAC) valve disconnected. Disconnect WDS or equivalent tester from DLC. Disconnect PCM Power Relay. Measure resistance of VPWR circuit (R) between IAC valve connector 0140-01 and PCM Power Relay connector. Is resistance less than 5.0 ohms?	Yes	Connect IAC valve. Go to next step.
1		No	Repair open VPWR circuit (R) between the PCM Power Relay and the splice to the IAC valve. Restore vehicle. Rerun quick test. See PCM QUICK TEST .
2	CHECK B+ AND IGN START/RUN VOLTAGE TO PCM POWER RELAY Measure B+ circuit (Y) voltage at the PCM Power Relay connector. Key ON. Engine OFF (KOEO). Measure IGN START/RUN circuit (T/B) voltage at PCM Power Relay connector. Are both voltages greater than 10.5 volts?	Yes	Go to next step.
2		No	Key OFF. Repair open in B+ (Y) or IGN START/RUN (T/B) circuit, verify condition of PCM diode. Restore vehicle. Rerun quick test. See PCM QUICK TEST .
3	CHECK GROUND CIRCUIT TO POWER RELAY Measure voltage between B+ (Y) circuit and ground (B/W) circuit at PCM Power Relay connector. Key OFF. Was the voltage greater than 10.5 volts?	Yes	Replace PCM Power Relay. Restore vehicle. Rerun quick test. See PCM QUICK TEST .
3		No	Repair open ground circuit. Restore vehicle. Rerun quick test. See PCM QUICK TEST .
Courtesy of MAZDA MOTORS CORP.