Crankshaft Position Sensor: Rio

NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source, as this will affect waveform.

Backprobing, connect lab scope positive probe to ECM connector B04 terminal No. 20 (White wire) and negative probe to ECM connector B04 terminal No. 10 (Green wire). See Figure. Start engine and allow it to reach normal operating temperature. With engine at idle, observe CKP waveform. Compare to normal waveform. See Figure. If CKP sensor waveform is erratic, replace CKP sensor.