DTC Troubleshooting: P0340 (57)

DTC P0340:  CMP Sensor A No Signal

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine.

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 CMP sensor A and the ECM/PCM.n


5.Turn the ignition switch OFF.

6.Disconnect the CMP sensor A 3P connector.

7.Turn the ignition switch ON (II).

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

 

Is there battery voltage?


YES - Go to 9.


NO - Repair open in the wire between the No. 4 ACG (10 A) fuse in the under-dash fuse/relay box and CMP sensor A, then go to 18.

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

 

Is there about 5 V?


YES - Go to 10.


NO - Go to 11.


10.Measure voltage between CMP sensor A 3P connector terminals No. 2 and No. 3.

 

Is there battery voltage?


YES - Go to 16.


NO - Repair open in the wire between CMP sensor A and G101, then go to 18.

11.Measure voltage between ECM/PCM connector terminal A19 and body ground.

 

Is there about 5 V?


YES - Repair open in the wire between the ECM/PCM (A19) and CMP sensor A, then go to 18.


NO - Go to 12.


12.Turn the ignition switch OFF.

13.Jump the SCS line with the HDS.

14.Disconnect ECM/PCM connector A (31P).

15.Check for continuity between ECM/PCM connector terminal A19 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (A19) and CMP sensor A, then go to 18.


NO - Go to 24.

16.Turn the ignition switch OFF.

17.Replace CMP sensor A.

18.Reconnect all connectors.

19.Turn the ignition switch ON (II).

20.Reset the ECM/PCM with the HDS.

21.Do the ECM/PCM idle learn procedure.

22.Start the engine.

23.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 CMP sensor A and the ECM/PCM, 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


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

25.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 CMP sensor A and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


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