P0340 CAMSHAFT POSITION (CMP) LOST

When Monitored and Set Condition:

When Monitored: While the engine is running.
Set Condition: The ECM no longer detects a signal from the Engine Position Sensor.

• POSSIBLE CAUSES

• INJECTOR DTCS PRESENT
• OTHER DTCS
• CAMSHAFT SENSOR
• (K72E) 5-VOLT SUPPLY CIRCUIT OPEN
• (K55) RETURN CIRCUIT OPEN
• (K53) SIGNAL CIRCUIT SHORTED TO GROUND
• (K53) SIGNAL CIRCUIT SHORTED TO SUPPLY (K72E) CIRCUIT
• (K53) SIGNAL CIRCUIT SHORTED TO (K55) RETURN CIRCUIT
• (K53) SIGNAL CIRCUIT SHORT TO VOLTAGE
• ECM
• INTERMITTENT CONDITION

DIAGNOSTIC PROCEDURE

1. With the DRBIII®, read DTCs. Do you have a DTC for P2146 or P2149?
   Yes --> Repair injector DTCs first. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
   No --> Go To 2
2. With the DRBIII®, read DTCs. Is any other DTCs present?
   Yes --> Repair other DTCs first. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
   No --> Go To 3
3. Turn the ignition off. Disconnect the cam sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance between the (K72E) 5-volt supply circuit and the (K53) signal circuit of the sensor. Is the resistance between 900 and 1100 ohms?
   Yes --> Go To 4
   No --> Replace the camshaft sensor. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
4. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance of the (K72E) 5-volt supply circuit between the ECM harness connector and the cam sensor harness connector. Is the resistance less than 10 ohms?
   Yes --> Go To 5
   No --> Repair the open (K72E) 5-volt supply circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
5. Measure the resistance of the (K55) return circuit between the ECM harness connector and the cam sensor harness connector. Is the resistance less than 10 ohms?
   Yes --> Go To 6
   No --> Repair the open (K55) return circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
6. Measure the resistance between the (K53) signal circuit in the sensor harness connector and battery negative. Is the resistance greater than 100k ohms?
   Yes --> Go To 7
   No --> Repair (K53) signal circuit shorted to ground. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
7. Measure the resistance between the (K53) signal circuit and the (K72E) 5-volt supply circuit in the sensor harness connector. Is the resistance greater than 100k ohms?
   Yes --> Go To 8
   No --> Repair (K53) signal circuit shorted to the (K72E) 5-volt supply circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
8. Measure the resistance between the (K53) signal circuit and the (K55) return circuit in the sensor harness connector. Is the resistance greater than 100k ohms?
   Yes --> Go To 9
   No --> Repair (K53) signal circuit shorted to the (K55) return circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
9. Measure the voltage between the (K53) signal circuit in the sensor harness connector and battery negative. Is the voltage less than 1 volt?
   Yes --> Go To 10
   No --> Repair (K53) signal circuit shorted to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
10. Reconnect the ECM harness connectors. Measure the voltage between the (K53) signal circuit in the sensor harness connector and battery negative. Is the voltage less than 1 volt?
    Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
    No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).