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Home › Jeep › 1996 › Cherokee Classic, Part Time, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System & Engine Component Tests - 2.5L Engine › Engine Sensors & Switches › Camshaft Position (CMP) Sensor

Camshaft Position (CMP) Sensor

  1. DO NOT disconnect distributor connector. Using an analog voltmeter, connect positive voltmeter lead to CMP sensor signal circuit (Tan/Yellow wire on Cherokee; Gray/Black wire on Grand Cherokee) at distributor wiring harness connector. Connect negative voltmeter lead to ground circuit (Black/Light Blue wire) at distributor wiring harness connector. Set voltmeter to 15-volt DC scale.
  2. With distributor cap removed, manually rotate crankshaft until pulse ring enters sync signal generator on CMP sensor. Distributor rotor should be at about 11 o'clock position. Turn ignition on. If voltage is about 5 volts, go to step 8). If voltage is not about 5 volts, check voltmeter leads for good connections.
  3. Repair connections as necessary and repeat step 2). If connections are okay and voltage is still not about 5 volts, check voltage at supply circuit (Violet/White wire on Cherokee; White/Black wire on Grand Cherokee) at CMP sensor harness connector. If voltage is present, replace CMP sensor. If voltage is not present, go to next step.
  4. Backprobe PCM connector and measure voltage between terminal A17 (Violet/White wire on Cherokee; White/Black wire on Grand Cherokee) and ground. PCM is located on right side of engine compartment. If no voltage is present, see appropriate CMP sensor circuit tests in TESTS W/CODES - 2.5L 4-CYL article. If voltage is present, go to next step.
  5. Check continuity of supply circuit (Violet/White wire on Cherokee; White/Black wire on Grand Cherokee) between distributor connector and PCM. If no continuity exists, repair wiring harness as necessary. If continuity exists, go to next step.
  6. Check continuity of CMP sensor signal wire (Tan/Yellow wire on Cherokee; Gray/Black wire on Grand Cherokee) between distributor connector and terminal A18 at PCM connector. If no continuity exists, repair wiring harness as necessary. If continuity exists, go to next step.
  7. Check continuity between ground and Black/Light Blue wire at distributor connector. If no continuity exists, repair wiring harness as necessary. If continuity exists, go to next step.
  8. Observe voltmeter and crank engine. Voltmeter needle should fluctuate from 0-5 volts. If voltage is as specified, CMP sensor is operating properly and sync pulse signal is being generated. If voltage is not as specified, replace CMP sensor.
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