Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 213

23-6
Code No. 23 Output shaft speed sensor system
If the output from the output shaft speed sensor is continuously 50% lower than the
vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of
30 km/h or more, there is judged to be an open circuit or short-circuit in the output
shaft speed sensor and diagnosis code No. 23 is output.
If diagnosis code No. 23 is output four times, the transmission is locked into 3rd
gear (D range) or 2nd gear as a fail-safe measure, and the N range lamp flashes
at a frequency of 1 Hz.
Measure at the output shaft speed sen-
sor connector A-82.
D Disconnect the connector
measure at the harness side.
(1) Voltage between 3 and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 2 and earth
(Ignition switch: ON)
OK: approx. 5 V
(3) Continuity between 1 and earth
OK: Continuity
OK
Measure output waveform of the output
shaft speed sensor.
(using an oscilloscope)
D Engine: 2,000 r/min
(approx. 50 km/h)
D Transmission: 3rd gear
(Voltage)
OK: Conforms to the waveform
shown at page 23-43* (In-
spection procedure using an
oscilloscope). There is no
noise in the output waveform.
OK
Check the trouble symptoms.
Code No. 25 Wide open throttle switch system
If the wide open throttle switch is on for 1 second or more with the throttle valve
opening angle at 70% or less, it is judged that there is a short circuit in the wide
open throttle switch and diagnosis code No. 25 is output.
Wide open throttle switch check (Refer to P.23-64.)*
Check the following connectors:
<4G6-MPI> B-61, B-65, B-14, B-110
<4G6-GDI> B-61, B-10
Harness check
D Between the wide open throttle switch and the engine-A/T-ECU
or A/T-ECU.
Check the trouble symptoms.
NOTE
*: Refer to '99 SPACE RUNNER/SPACE WAGON Workshop Manual (Pub. No. PWDE9803).
AUTOMATIC TRANSMISSION -
NG
Check the following connectors:
<4G6-MPI> A-82, B-14, B-93, B-89,
and B-110
<4G6-GDI> A-82, B-14, B-93, B-89,
B-11
Check the following harness:
D Between the output shaft speed
sensor and the ignition switch
D Between the output shaft speed
sensor and engine-A/T-ECU or
A/T-ECU
Check the trouble symptoms.
NG
Replace the output shaft speed sensor.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU or A/T-
ECU.
OK
OK
OK
Troubleshooting
Probable cause
D Malfunction of the output shaft speed sensor
D Malfunction of the transfer drive gear or driven gear
D Malfunction of connector
D Malfunction of the engine-A/T-ECU <4G6-MPI>
D Malfunction of the A/T-ECU <4G6-GDI>
L: Refer to the Transmission Workshop Manual.
NG
OK
NG
OK
NG
NG
Probable cause
D Malfunction of the wide open throttle switch
D Malfunction of connector
D Malfunction of the engine-A/T-ECU <4G6-MPI>
D Malfunction of the A/T-ECU <4G6-GDI>
NG
Replace
NG
Repair
NG
Repair
NG
Replace the engine-A/T-ECU or A/T-ECU.
Repair
Repair
Replace the engine-A/T-ECU or A/T-
ECU.
A/T overhaul L
D Replace the transfer drive gear and
driven gear.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.