P2138-ACCELERATOR PEDAL POSITION SENSOR 1/2 CORRELATION





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on, battery voltage greater than 10.4 volts, and no APPS 1 and APPS 2 DTCs present.

  • Set Condition:

    The PCM detects that the correlation between APPS 1 and APPS 2 is not plausible. Idle may be affected when the brake pedal is pressed or if a brake switch circuit error is present. Acceleration rate and engine output are limited. One trip fault and the code will set within 5 seconds. ETC light is flashing.


Possible Causes
 
INTERMITTENT DTC
 
(F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
 
(K23) APP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE
 
(K167) APP SENSOR GROUND 1 CIRCUIT OPEN OR HIGH RESISTANCE
 
(K858) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
 
(K29) APP SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE
 
(K400) APP SENSOR GROUND 2 CIRCUIT OPEN OR HIGH RESISTANCE
 
ACCELERATOR PEDAL POSITION SENSOR
 
POWERTRAIN CONTROL MODULE (PCM)
 


Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).



Diagnostic Test

1.DTC IS ACTIVE

NOTE: Diagnose and repair any APPS, system voltage, or sensor supply voltage DTCs before continuing with this test.



WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.




Is the status Active for this DTC?

Yes
  • Go to 2


No

2.(F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE








Is the resistance below 5.0 ohms?

Yes
  • Go to 3


No

3.(K23) APP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE





Is the resistance below 5.0 ohms?

Yes
  • Go to 4


No

4.(K167) APP SENSOR GROUND 1 CIRCUIT OPEN OR HIGH RESISTANCE





Is the resistance below 5.0 ohms?

Yes
  • Go to 5


No

5.(K858) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE





Is the resistance below 5.0 ohms?

Yes
  • Go to 6


No

6.(K29) APP SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE





Is the resistance below 5.0 ohms?

Yes
  • Go to 7


No

7.(K400) APP SENSOR GROUND 2 CIRCUIT OPEN OR HIGH RESISTANCE





Is the resistance below 5.0 ohms?

Yes
  • Go to 8


No

8.ACCELERATOR PEDAL POSITION SENSOR










Does the scope pattern show any missing or erratic signals?

Yes


No
  • Go to 9

9.POWERTRAIN CONTROL MODULE (PCM)








Were any problems found?

Yes


No