DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P0340

DTC P0340 : CMP Sensor A No Signal

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How to Troubleshoot the Fuel And Emissions Systems.

1. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS. How to Troubleshoot the Fuel And Emissions Systems

-3. Start the engine.

-4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0340 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor A and the PCM.

2. Open wire check (IG1(CAM)/IG1(MAIN)/IG1 ACG line):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.






-3. Turn the ignition switch to ON (II).

-4. Measure the voltage between test points 1 and 2.










Is there battery voltage?
-YES- The IG1(CAM)/IG1(MAIN)/IG1 ACG wire is OK. Go to step 3.
-NO- Repair an open in the IG1(CAM)/IG1(MAIN)/IG1 ACG wire between No. B2 (10 A) fuse in the under-dash fuse/relay box and CMP sensor A, then do the repair verification.

3. Determine possible failure area (CAM line, others):

-1. Measure the voltage between test points 1 and 2.










Is there about 5.0 V?
-YES- The CAM wire is OK. Go to step 4.
-NO- There is a problem in the CAM wire. Go to step 5.

4. Open wire check (LG2 line):

-1. Measure the voltage between test points 1 and 2.










Is there battery voltage?
-YES- The LG2 wire is OK. Replace CMP sensor A CMP Sensor A Removal And Installation, then do the repair verification.
-NO- Repair an open in the LG2 wire between CMP sensor A and G101, then do the repair verification.

5. Shorted wire check (CAM line):

-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.






-4. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- Repair a short in the CAM wire between the PCM (C16) and CMP sensor A, then do the repair verification.
-NO- The CAM wire is not shorted. Go to step 6.

6. Open wire check (CAM line):

-1. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- The CAM wire is OK. Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then do the repair verification.
-NO- Repair an open in the CAM wire between the PCM (C16) and CMP sensor A, then do the repair verification.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the PCM with the HDS How to Troubleshoot the Fuel And Emissions Systems.

-5. Do the PCM idle learn procedure PCM Idle Learn Procedure.

-6. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0340 indicated?
-YES- Check for poor connections or loose terminals at CMP sensor A and the PCM. If the PCM was updated, substitute a known-good PCM Service and Repair, then recheck. If the PCM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.