GDI ± Troubleshooting
13A-34
Code No.78 Accelerator pedal position sensor (1st
channel) system
Probable cause
Range of check
D Accelerator pedal position sensor (2nd channel) system is normal.
D Communication between the engine-ECU and throttle valve controller is normal.
Set conditions
D Output voltage of accelerator position sensor (1st channel) system is 0.2 V or
less for one second.
or
D Output voltage of the accelerator pedal position sensor (2nd channel) is 2.5
V or less, and (1st channel) output voltage of the accelerator pedal position
sensor is 4.5 V or more for one second.
or
D Difference between the accelerator pedal position sensor (1st and 2nd channels)
output voltages exceeds 1.0 V (i.e. when the throttle valve opening angle changes
slightly).
or
D Although the accelerator pedal position switch is on, 1st-channel output voltage
of the accelerator pedal position sensor exceeds 1.1 V for one second.
D Malfunction of the accelerator pedal position sensor
(1st channel)
D Open circuit or short-circuited harness wire in the
accelerator pedal position sensor (1st channel)
system, or poor connector contact
D ON-seizure of the accelerator pedal position switch
D Malfunction of the throttle valve controller
D Malfunction of the engine-ECU
NG
Repair
OK
Adjust the accelerator pedal position
sensor. (Refer to P.13A-94.)
NG
Repair
OK
Replace the engine-ECU.
MUT-II Data list
26 Accelerator pedal position switch
(P.13A-73.)
NG
Check the accelerator pedal position
switch system. (Refer to P.13A-65.),
INSPECTION PROCEDURE 27.)
OK
Check the accelerator pedal position
sensor (1st channel). (Refer to P.13A-
104.)
NG
Replace the accelerator pedal position
sensor assembly.
OK
Measure at the accelerator pedal posi-
tion sensor (1st channel) connector
C-46.
D Disconnect the connector, and
measure at the harness side.
D Voltage between terminal 2 and
earth (Ignition switch: ON)
OK: 4.8 ± 5.2 V
D Continuity between terminal 5 and
earth
OK: Continuity
NG
Check the following connectors:
A-36, C-18, C-19
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
accelerator pedal position sensor (1st
channel) and engine-ECU.
OK
Measure at the engine-ECU C-19.
D Connect the connector.
D Voltage between terminal 94 and
earth
(Ignition switch: ON)
OK: 0.935 ± 1.135 V
(Accelerator pedal: fully re-
leased)
4.1 V or more
(Accelerator pedal: fully de-
pressed)
NG
Check the following connector:
C-46
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
accelerator pedal position sensor (1st
channel) and engine-ECU.
Check trouble symptom.
NG
Replace the engine-ECU.
OK
MUT-II Data list
77 Accelerator pedal position sensor
(2nd channel). (Refer to P.13A-75.)
NG
Check the accelerator pedal position
sensor (2nd channel) system. (Refer
to P.13A-33, INSPECTION PROCE-
DURE FOR DIAGNOSIS CODE 77.)
OK
Replace the engine-ECU.
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