1996 PCED OBDI
SECTION 18: Diesel Diagnosis — 7.3L DI Engine

E: Accelerator Pedal (AP) Sensor
  E: Introduction  

 

E1 DIAGNOSTIC TROUBLE CODE (DTC) 0123

Does reading go above 4.5v?
YesNo
GO to E2.CLEAR DTCs and RETEST.
 

E2 INDUCE OPPOSITE FAILURE

Does AP voltage reading on NGS Tester read 0v?
YesNo
Circuit OK. REPLACE accelerator pedal assembly. CLEAR DTCs and RETEST.GO to E3.
 

E3 CHECK AP SENSOR SIGNAL WIRE

Is voltage above 4.5v?
YesNo
GO to E4.REPLACE PCM. Internal failure. CLEAR DTCs and RETEST.
 

E4 CHECK AP CIRCUIT FOR SHORTS TO POWER

Is voltage present?
YesNo
REPAIR short to power in Circuit 355 (GY/W). CLEAR DTCs and RETEST.REPLACE PCM. Internal failure. CLEAR DTCs and RETEST.
 

E5 DIAGNOSTIC TROUBLE CODE (DTC) 0122

Does voltage drop below .37v?
YesNo
GO to E6.Unable to duplicate and/or identify concern at this time. CLEAR DTCs and RETEST.
 

E6 INDUCE OPPOSITE FAILURE

Does NGS Tester display stay on and read over 4.5v?
YesNo
REPLACE accelerator pedal assembly. CLEAR DTCs and RETEST.GO to E7.
 

E7 CHECK VREF CIRCUIT VOLTAGE

Is voltage 5v ± .5?
YesNo
GO to E8.SERVICE open in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST.
 

E8 CHECK SIGNAL RETURN CIRCUIT

Is resistance less than 5 ohms?
YesNo
GO to E9.SERVICE open in signal return Circuit 359 (GY/R). CLEAR DTCs and RETEST.
 

E9 CHECK AP CIRCUIT CONTINUITY

Is the resistance less than 5 ohms?
YesNo
GO to E10.SERVICE open in AP signal Circuit 355 (GY/W). REMOVE breakout box. CLEAR DTCs and RETEST.
 

E10 CHECK AP CIRCUIT FOR SHORTS TO GROUND

Is each resistance greater than 10,000 ohms?
YesNo
GO to E11. CLEAR DTCs and RETEST.SERVICE short to ground in AP sensor signal Circuit 355 (GY/W). CLEAR DTCs and RETEST. REMOVE breakout box.
 

E11 VREF CIRCUIT CONTINUITY CHECK

Is resistance less than 5 ohms?
YesNo
GO to E12.REPAIR open in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST.
 

E12 SIGNAL RETURN CIRCUIT CONTINUITY CHECK

Is resistance less than 5 ohms?
YesNo
REPLACE PCM. CLEAR DTCs and RETEST.REPAIR open in signal. RETURN Circuit 359 (GY/R).