DTC Troubleshooting: P2138
DTC P2138: APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
      

1.
Problem verification:

Problem verification
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Press the accelerator pedal to the floor.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
      

Is DTC P2138 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 APP sensor and the PCM.?
2.
APP sensor signal check:

APP sensor signal check
?1.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
APP SENSOR A
    
APP SENSOR B
    

Are they the same voltage?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Determine possible failure area (PCM, others):

Determine possible failure area (PCM, others)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
Test circuit
APS1, APS2
Test point 1
PCM connector A (51P) No. 45 (YEL)
Test point 2
PCM connector A (51P) No. 38 (WHT)


Is there continuity?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
4.
Shorted wire check (APS1 line to APS2 line):

Shorted wire check (APS1 line to APS2 line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
PCM connector A (51P): disconnected
 
APP sensor 6P connector: disconnected
Test circuit
APS1, APS2
Test point 1
PCM connector A (51P) No. 45 (YEL)
Test point 2
PCM connector A (51P) No. 38 (WHT)


Is there continuity?

     
YES
     
     
     
Repair a short in the APS1 wire to the APS2 wire between PCM connector terminals A45 (APS1 line) and A38 (APS2 line), then do the repair verification.
     
NO
     
     
     
The APS1 and APS2 wires are OK. Replace the APP sensor, then do the repair verification.
Repair verification:

?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?5.
Reset the PCM with the HDS.


?6.
Do the PCM idle learn procedure.

?7.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?8.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?9.
Press the accelerator pedal to the floor.

?10.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
      


Is DTC P2138 indicated?

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