Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 395

13A-36
Code No.91 Electronic-controlled throttle valve system
Range of check
Ignition switch: ON
Error in communication between the engine-ECU and throttle valve controller
Set conditions
Output voltage of the throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value.
Range of check
Ignition switch: ON
Error in communication between the throttle valve controller and engine-ECU
Set conditions
The throttle valve opening angle (voltage) which the engine-ECU requested of
the throttle valve controller is significantly different from output voltage of the
(2nd channel) throttle position sensor (approx. one volt).
MUT-II Self-Diag code
Is any other diagnosis code than No.94 output?
Check the harness wire between the throttle valve controller and
engine-ECU.
Replace the throttle valve controller.
Code No.92 Throttle valve position feedback system
The throttle valve controller determines if a failure is present, and sends its result
to the engine-ECU.
Range of check
Ignition switch: ON
System voltage: 8 V or more
Set condition
Motor position feedback system is defective (System detects a motor overcurrent,
or that actual and projected opening angles of the throttle position sensor (1st
channel) are different by 1.0 V or more.
Check the throttle valve control servo. (Refer to P.13A-109.)
Check the following connectors: A-68, B-15
Check trouble symptom.
Check the harness wire between the throttle valve control servo
and throttle valve controller.
Replace the throttle body.
Check trouble symptom.
Replace the throttle valve controller.
GDI –
No
OK
OK
OK
NG
OK
NG
Troubleshooting
Probable cause
Short in communication line
Malfunction of the engine-ECU
Malfunction of the throttle valve controller
Yes
Follow INSPECTION PROCEDURE FOR DIAGNOSIS CODE.
NG
Repair
Probable cause
Malfunction of the throttle position sensor (1st channel)
Open circuit or short-circuited harness wire in the
throttle position sensor system (1st channel), or poor
connector contact
Malfunction of the throttle valve controller
NG
Replace
NG
Repair
NG
Repair