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DTC P0340 - CMP Sensor Circuit Malfunction

  1. Remove PCM, leaving wire harnesses connected. Remove distributor cap and rotor. Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and PCM harness connector "B", terminal No. 3 (White wire) while rotating distributor shaft. See Figure . As hall-effect signal rotor breaks magnetic field of CMP sensor, reading should be 3-5.25 volts. As hall-effect signal rotor passes CMP sensor, reading should return to 0-1 volt. If reading is as specified, replace PCM. Retest system. If reading is a constant 3-5.25 volts, go to next step. If reading is a constant 0-1 volt, go to step 3).
  2. Check for open Black/Orange wire or Blue/Black wire. Repair as necessary. If wires are okay, replace CMP sensor.Retest system.
  3. Check for poor connection at PCM. Check White wire for short to ground. Repair as necessary. If wire is okay, replace CMP sensor. Retest system.
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