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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 938 (Engine Controls And Fuel - 6.6L (LMM) - DTC P02E0 To DTC P154A) >> DTC P0340 or P0341 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure that the CMP sensor circuits are not routed too closely to the fuel injector wiring, after-market add-on electrical equipment, solenoids, relays, or motors.
  2. With the key ON and the CMP sensor disconnected, measure the voltage between the 5-volt reference terminal 3 and a good ground and observe that the DMM measures 4.98-5.02 volts.
    • If the DMM does not measure 4.98-5.02 volts, test the 5-volt reference for an open or high resistance. If the circuits test normal, replace the control module.
  3. With the key ON and the CMP sensor disconnected, measure the voltage between the 5-volt reference circuit terminal 3 and the low reference circuit terminal 2 and observe that the DMM measures 4.98-5.02 volts.
    • If the DMM does not measure 4.98-5.02 volts, test the low reference for an open or high resistance. If the circuits test normal, replace the control module.
  4. With the key ON and the CMP sensor disconnected, connect a fused jumper wire to the signal circuit terminal 1 and momentarily and repeatedly probe the low reference circuit terminal 2, and observe if the Cam Signal Present and Engine RPM parameters change.
    • If the cam signal and Engine RPM parameters do not change, test the signal circuit for an open, high resistance, a short to ground, a short to voltage. If the circuits test normal, replace the control module.
  5. Remove the front engine cover and inspect the CMP sensor for physical damage, loose or improper installation, foreign material passing between the sensor and the reluctor wheel, timing gear misalignment, or front engine cover damage.
  6. Inspect the CMP reluctor wheel for physical damage, improper installation, or excessive endplay or looseness.
  7. If no other condition is found, replace the CMP sensor.
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