Camshaft Position Sensor

WARNING: This page is about a different variant/trim than selected.

NOTE: Enter this test only when Code 03 is displayed during self-test procedures (KOEO or KOER) or when directed here from another circuit test. This test is intended to diagnose CMP circuit only.

NOTE: CMP sensor is integrated into the distributor assembly.

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin No.	PCM Pin	Wire Color
CMP	6	3G	Blue/Pink
GND	49	3C	Black/Red
VPWR	37 & 57	1B	Red/Black

1) Check System Integrity Visually check all wiring, connectors and components for evidence of damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to next step.

2) Check CMP Signal Turn ignition off. Install breakout box. Connect PCM to breakout box. Measure voltage at CMP test pin at breakout box while bumping starter. If voltage fluctuates between zero and 5 volts, circuit is okay. If no other problem or code is found, replace PCM. If voltage does not fluctuate between zero and 5 volts, go to next step.

3) Check VPWR To Distributor Ensure ignition is off. Disconnect distributor connector. Turn ignition on. Measure voltage at VPWR wire at distributor connector. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to CIRCUIT TEST VPWR. If VPWR circuit is okay, repair VPWR wire to distributor.

4) Check Distributor Ground Turn ignition off. Ensure distributor is disconnected. Measure resistance of GND wire between distributor connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open GND wire.

5) Check For Open CMP Wire Ensure ignition is off. With breakout box installed, disconnect PCM connectors. Measure resistance of CMP wire between ground and CMP test pin at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open CMP circuit wire.

6) Check For Short In CMP Wire With breakout box installed and PCM and distributor connectors disconnected, measure resistance of CMP wire between ground and CMP test pin at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in CMP wire.

7) Check For Short In Harness Turn ignition off. Disconnect distributor and PCM connector. Measure resistance between CMP wire and all other wires in distributor harness connector. See Fig 1. If all resistances are greater than 10,000 ohms, replace distributor. If any resistance reading is less than 10,000 ohms repair shorted wire(s) in question.

Fig 1: Identifying Distributor Connector Terminals