DTC Troubleshooting: P0340 (57-7)

DTC P0340:  CMP Sensor No Signal

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine. If engine does not start, keep cranking for 10 seconds.

4.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0340 indicated?


YES - Go to 5.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the CKP sensor and the ECM.n


5.Turn the ignition switch OFF.

6.Disconnect the CMP sensor 3P connector.

7.Turn the ignition switch ON (II).

8.Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground.

 

Is there about 5 V?


YES - Go to 13.


NO - Go to 9.

9.Turn the ignition switch OFF, and wait 30 seconds.

10.Disconnect ECM connector No. 1 (96P).

11.Connect CMP sensor 3P connector terminal No. 1 to body ground with a jumper wire.

 

12.Check for continuity between ECM connector No. 1 terminal No. 29 and body ground.

 

Is there continuity?


YES - Go to 31.


NO - Repair open in the wire between the CMP sensor and ECM connector No. 1 terminal No. 29, then go to 26.

13.Measure voltage between CMP sensor 3P connector terminal No. 2 and body ground.

 

Is there about 5 V?


YES - Go to 19.


NO - Go to 14.


14.Turn the ignition switch OFF, and wait 30 seconds.

15.Disconnect ECM connector No. 1 (96P).

16.Check for continuity between ECM connector No. 1 terminal No. 60 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the CMP sensor and ECM connector No. 1 terminal No. 60, then go to 26.


NO - Go to 17.

17.Connect CMP sensor 3P connector terminal No. 2 to body ground with a jumper wire.

 

18.Check for continuity between ECM connector No. 1 terminal No. 60 and body ground.

 

Is there continuity?


YES - Go to 31.


NO - Repair open in the wire between the CMP sensor and ECM connector No. 1 terminal No. 60, then go to 26.

19.Measure voltage between CMP sensor 3P connector terminals No. 1 and No. 3.

 

Is there about 5 V?


YES - Go to 24.


NO - Go to 20.


20.Turn the ignition switch OFF, and wait 30 seconds.

21.Disconnect ECM connector No. 1 (96P).

22.Connect CMP sensor 3P connector terminal No. 3 to body ground with a jumper wire.

 

23.Check for continuity between ECM connector No. 1 terminal No. 14 and body ground.

 

Is there continuity?


YES - Go to 31.


NO - Repair open in the wire between the CMP sensor and ECM connector No. 1 terminal No. 14, then go to 26.


24.Turn the ignition switch OFF.

25.Replace the CMP sensor.

26.Reconnect all connectors.

27.Turn the ignition switch ON (II).

28.Reset the ECM with the HDS.

29.Start the engine.

30.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n

31.Update the ECM if it does not have the latest software, or substitute a known-good ECM.

32.Start the engine.

33.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM.n