GDI ± Troubleshooting
13A-33
Code No.77 Accelerator pedal position sensor (2nd
channel) system
Probable cause
Range of check
D Accelerator pedal position sensor (1st channel) system is normal.
D Communication between the engine-ECU and throttle valve controller is normal.
Set conditions
D Output voltage of accelerator pedal position sensor (2nd channel) system is
0.2 V or less for one second.
or
D Output voltage of the accelerator pedal position sensor (1st channel) is 2.5 V
or less, and output voltage of the accelerator pedal position sensor (2nd channel)
is 4.5 V or more for one second.
or
D Difference between the accelerator pedal position sensor output voltages (1st
and 2nd channels) exceeds 1.0 V (i.e. when the throttle valve opening angle
changes slightly).
D Malfunction of the accelerator pedal position sensor
(2nd channel)
D Open circuit or short-circuited harness wire in the
accelerator pedal position sensor (2nd channel)
system, or poor connector contact
D Malfunction of the throttle valve controller
D Malfunction of the engine-ECU
Check the harness wire between the
throttle valve controller and the acceler-
ator pedal position sensor (2nd chan-
nel).
NG
Repair
OK
Replace the throttle valve controller.
NG
Repair
OK
Adjust the accelerator pedal position
sensor. (Refer to P.13A-94.)
Check the accelerator pedal position
sensor (2nd channel). (Refer to P.13A-
104.)
NG
Replace the accelerator pedal position
sensor assembly.
OK
Measure at accelerator pedal position
sensor (2nd channel) connector C-46.
D Disconnect the connector, and
measure at the harness side.
D Voltage between terminal 8 and
earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V
D Continuity between terminal 7 and
earth
OK: Continuity
NG
NG
Repair
OK
Check trouble symptom.
NG
OK
Measure at throttle valve controller con-
nector C-48.
D Connect the connector.
D Voltage between terminal 20 and
earth (Ignition switch: ON)
OK: 0.7 ± 1.4 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 (2nd
channel) and throttle valve controller.
Check trouble symptom.
NG
Replace the throttle valve controller.
OK
MUT-II Data list
78 Accelerator pedal position sensor
(1st channel). (Refer to P.13A-75.)
NG
Check the accelerator pedal position
sensor (1st channel) system. (Refer to
P.13A-34, INSPECTION PROCE-
DURE FOR DIAGNOSIS CODE 78.)
OK
Replace the throttle valve controller.
Check the following connector:
C-48
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