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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Controls - Self-Diagnostics - 3.9L & 5.9L) >> Diagnostic Tests >> DTC P0340: No Cam Reference Signal At Pcm >> Testing

DTC P0340: No Cam Reference Signal At Pcm: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the DRBIII(R) scan tool, read DTCs and record the related freeze frame data. With the DRBIII(R) scan tool, erase DTCs. Start the engine. If the DTC does not set right away it may be necessary to test drive the vehicle. Does the DTC return? If yes, go to next step. If no, go to step  14 .
  2. Turn the ignition off. Disconnect the CMP sensor harness connector. Turn ignition on, with engine off. Measure the voltage on the (K7) 5-volt supply circuit at the CMP sensor harness connector. Is the voltage between 4.8 and 5.2 volts? If yes, go to next step. If no, go to step  10 .
  3. Measure the voltage on the (K44) CMP sensor signal circuit at the CMP sensor harness connector. Is the voltage between 4.5 and 5.0 volts? If yes, go to next step. If no, go to step  6 .
  4. Turn ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the CMP sensor harness connector to the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the (K4) sensor ground circuit.
  5. Inspect the camshaft sprocket for damage. If a problem is found repair as necessary. If there are no possible causes remaining, repair or replace the camshaft position sensor.
  6. Turn the ignition off. Disconnect the PCM harness connectors. Turn ignition on, with engine off. Measure the voltage on the (K44) CMP sensor signal circuit at the CMP sensor harness connector. Is the voltage more than 5.2 volts? If yes, repair the short to voltage in the (K44) CMP sensor signal circuit. If no, go to next step.
  7. Turn the ignition off. Measure the resistance of the (K44) CMP sensor signal circuit from the CMP sensor harness connector to the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the (K44) CMP sensor signal circuit.
  8. Measure the resistance between ground and the (K44) CMP sensor signal circuit at the CMP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the short to ground in the (K44) CMP sensor signal circuit. If no, go to next step.
  9. Measure the resistance between the (K44) CMP sensor signal circuit and the (K7) 5-volt supply circuit in the CMP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the short between the (K7) 5-volt supply circuit and the (K44) CMP sensor signal circuit. If no, go to next step.
  10. Turn the ignition off. Disconnect the PCM harness connectors. Turn ignition on, with engine off. Measure the voltage on the (K7) 5-volt supply circuit at the CMP sensor harness connector. Is the voltage more than 5.2 volts? If yes, repair the short to voltage in the (K7) 5-volt supply circuit. If no, go to next step.
  11. Turn the ignition off. Measure the resistance of the (K7) 5-volt supply circuit from the CMP sensor harness connector to the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the (K7) 5-volt supply circuit.
  12. Measure the resistance between ground and the (K7) 5-volt supply circuit at the CMP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the short to ground in the (K7) 5-volt supply circuit. If no, go to next step.
    13. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  13. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING  .
    14. WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
  14. The following tests may help in identifying a possible intermittent condition with the CMP sensor or its related wire harness. Turn ignition on, with engine off. With the DRBIII(R) scan tool as a Dual Channel Lab Scope and the Miller Special Tool (6801), backprobe the (K44) CMP signal circuit in the CMP sensor connector and the PCM harness connector. Wiggle the related wire harness and connections. Monitor the lab scope screen. Start the engine. Lightly tap on the Cam sensor and wiggle the CMP sensor connector and wire harness. Observe the lab scope screen. Look for any erratic pulses generated by the CMP sensor. Did the CMP sensor generate any erratic pulses? If yes, carefully inspect the wire harness and connections, repair as necessary, if OK, replace the CMP sensor. If no, go to next step.
    15. WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
  15. An intermittent CKP sensor failure may cause the P0340 code to set. Turn ignition on, with engine off. With the DRBIII(R) scan tool as a Dual Channel Lab Scope and the Miller Special Tool (6801), backprobe the (K24) CKP signal circuit in the CKP sensor connector and the PCM harness connector. Wiggle the related wire harness and connections. Monitor the lab scope screen. Start the engine. Lightly tap on the CKP sensor and wiggle the CKP sensor connector and wire harness. Observe the lab scope screen. Look for any erratic pulses generated by the CKP sensor. Did the CKP sensor generate any erratic pulses? If yes, carefully inspect the wire harness and connections, repair as necessary, if OK, replace the CKP sensor. If no, the test is complete.
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