DTC Troubleshooting: P2127
DTC P2127: APP Sensor B (TP Sensor E) Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2127 APP Sensor B (TP Sensor E) Circuit Low Voltage
    

1.
Problem verification:

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

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
APP SENSOR B
Less than 0.2
V
    

Do the current condition(s) match the threshold?

     
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. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Determine possible failure area (VCC5 line, others):

Determine possible failure area (VCC5 line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
APP sensor 6P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
APP sensor 6P connector: disconnected
Test point 1
APP sensor 6P connector (female terminals) No. 1:
Test point 2
APP sensor 6P connector (female terminals) No. 2:


Is there about 5.0 V?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 6.
3.
Shorted wire check (APS2 line):

Shorted wire check (APS2 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


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

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
APP sensor 6P connector: disconnected
 
PCM connector A (51P): disconnected
Test point 1
APP sensor 6P connector (female terminals) No. 3:
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the APS2 wire between the PCM (A38) and the APP sensor.?
     
NO
     
     
     
The APS2 wire is not shorted. Go to step 4.
4.
Open wire check (APS2 line):

Open wire check (APS2 line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
APP sensor 6P connector (female terminals) No. 3:
Terminal B
Body ground


?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
APP sensor 6P connector: disconnected
 
APP sensor 6P connector No. 3: jumped to body ground
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 38
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The APS2 wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the APS2 wire between the PCM (A38) and the APP sensor.?
5.
PCM internal circuit check:

PCM internal circuit check
?1.
Remove the jumper wire from the APP sensor 6P connector.

?2.
Reconnect the following connector.
PCM connector A (51P)

?3.
Connect terminals A and B with a jumper wire.
Terminal A
APP sensor 6P connector (female terminals) No. 1:
Terminal B
APP sensor 6P connector (female terminals) No. 3:


?4.
Turn the vehicle to the ON mode.

?5.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
APP SENSOR B
Less than 0.2
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM.?
     
NO
     
     
     
6.
Open wire check (VCC5 line):

Open wire check (VCC5 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


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

?4.
Connect terminals A and B with a jumper wire.
Terminal A
APP sensor 6P connector (female terminals) No. 1:
Terminal B
Body ground


?5.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
APP sensor 6P connector: disconnected
 
APP sensor 6P connector No. 1: jumped to body ground
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 40
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The VCC5 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM.?
     
NO
     
     
     
Repair an open in the VCC5 wire between the PCM (A40) and the APP sensor.?