Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 474 / 1164

AUTOMATIC TRANSMISSION -
Troubleshooting
23-14
Code No. 21 Crank angle sensor system Probable cause
If no output pulse is detected from the crank angle sensor for 5 seconds or more
while driving at 25 km/h or more, it is judged that there is an open circuit in the
crank angle sensor and diagnosis code No. 21 is output.
D Malfunction of the crank angle sensor
D Malfunction of connector
D Malfunction of the A/T-ECU
Check the following connectors:
A-71, B-51, B-11
NG
Repair
OK
Harness check
D Between crank angle sensor and A/T-ECU
NG
Repair
OK
Crank angle sensor system check
(Refer to GROUP 13 - Troubleshooting.)
OK
Check the trouble symptoms.
NG
Replace the A/T-ECU.
Code No. 22 Input shaft speed sensor system Probable cause
If no output pulse is detected from the input shaft speed sensor 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 input shaft speed sensor and diagnosis
code No. 22 is output. If diagnosis code No. 22 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.
D Malfunction of the input shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of connector
D Malfunction of A/T
-
ECU
L : Refer to the Transmission Workshop Manual.
Replace the A/T
-
ECU.
A/T overhaul K
D Replace the underdrive clutch
retainer.
Replace the A/T
-
ECU.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
NG
OK
Check the trouble symptoms.
OK
Check the following harness:
D Between the input shaft speed
sensor and the ignition switch
D Between the input shaft speed
sensor and A/T
-
ECU
NG
Repair
NG
Check the trouble symptoms.
NG
OK
Check the trouble symptoms.
OK
Measure output waveform of the input
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 (Inspec-
tion procedure using an oscil-
loscope). There is no noise
in the output waveform.
NG
Replace the input shaft speed sensor.
Measure at the input shaft speed sensor
connector A-90.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between 3 and earth
(Ignition switch: ON)
OK:
Battery voltage
(2) Voltage between 2 and earth
(Ignition switch: ON)
OK
approx. 5 V
(3) Continuity between 1 and earth
OK:
Continuity
NG
Check the following connectors:
A-90, B-14, B-93, B-89, B-11
NG
Repair