DTC Troubleshooting: P0340
DTC P0340: CMP Sensor A No Signal
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0340 CMP Sensor A No Signal
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0340 CMP Sensor A No Signal
      

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 the CMP sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Open wire check (FI MAIN RLY OUT/IGP(TDCAM) line):

Open wire check (FI MAIN RLY OUT/IGP(TDCAM) line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
CMP sensor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CMP sensor 3P connector: disconnected
Test point 1
CMP sensor 3P connector No. 1
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The FI MAIN RLY OUT/IGP(TDCAM) wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the FI MAIN RLY OUT/IGP(TDCAM) wire between PGM-FI main relay 1 and the CMP sensor.?
3.
Determine possible failure area (TDCAM line, LG line):

Determine possible failure area (TDCAM line, LG line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CMP sensor 3P connector: disconnected
Test point 1
CMP sensor 3P connector No. 3
Test point 2
Body ground


Is there about 5.0 V?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 5.
4.
Open wire check (LG line):

Open wire check (LG line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
CMP sensor 3P connector: disconnected
Test point 1
CMP sensor 3P connector No. 1
Test point 2
CMP sensor 3P connector No. 2


Is there battery voltage?

     
YES
     
     
     
The LG wire is OK. Replace the CMP sensor.?
     
NO
     
     
     
Repair an open in the LG wire between the CMP sensor and G101.?
5.
Shorted wire check (TDCAM line):

Shorted wire check (TDCAM line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector B (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CMP sensor 3P connector: disconnected
 
PCM connector B (51P): disconnected
Test point 1
PCM connector B (51P) No. 30
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short in the TDCAM wire between the PCM (B30) and the CMP sensor.?
     
NO
     
     
     
The TDCAM wire is not shorted. Go to step 6.
6.
Open wire check (TDCAM line):

Open wire check (TDCAM line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
CMP sensor 3P connector: disconnected
 
PCM connector B (51P): disconnected
Test point 1
PCM connector B (51P) No. 30
Test point 2
CMP sensor 3P connector No. 3


Is there continuity?

     
YES
     
     
     
The TDCAM wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0340 goes away and the PCM was updated, troubleshooting is complete. If DTC P0340 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the TDCAM wire between the PCM (B30) and the CMP sensor.?