Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 212

Code No. 21 Crank angle sensor system
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.
Check the following connectors:
<4G6-MPI> A-71, B-112
<4G6-GDI> A-71, B-51, B-11
Harness check
D Between crank angle sensor and engine-A/T-ECU or A/T-ECU
Crank angle sensor system check
(Refer to GROUP 13 - Troubleshooting.)*
Check the trouble symptoms.
Code No. 22 Input shaft speed sensor system
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.
Measure at the input shaft speed sensor
connector A-90.
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 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* (In-
spection procedure using an
oscilloscope). There is no
noise in the output waveform.
OK
Check the trouble symptoms.
NOTE
*: Refer to '99 SPACE RUNNER/SPACE WAGON Workshop Manual (Pub. No. PWDE9803).
AUTOMATIC TRANSMISSION -
OK
OK
OK
NG
Check the following connectors:
<4G6-MPI> A-90, B-14, B-93, B-89,
and B-110
<4G6-GDI> A-90, B-14, B-93, B-89,
B-11
Check the following harness:
D Between the input shaft speed
sensor and the ignition switch
D Between the input shaft speed
sensor and engine-A/T-ECU or
A/T-ECU
Check the trouble symptoms.
NG
Replace the input shaft speed sensor.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU or A/T-
ECU.
Troubleshooting
Probable cause
D Malfunction of the crank angle sensor
D Malfunction of connector
D Malfunction of the engine-A/T-ECU <4G6-MPI>
D Malfunction of the A/T-ECU <4G6-GDI>
NG
Repair
NG
Repair
NG
Replace the engine-A/T-ECU or A/T-ECU.
Probable cause
D Malfunction of the input shaft speed sensor
D Malfunction of the underdrive clutch retainer
D Malfunction of connector
D Malfunction of the engine-A/T-ECU <4G6-MPI>
D Malfunction of A/T-ECU <4G6-GDI>
L: Refer to the Transmission Workshop Manual.
NG
OK
NG
OK
NG
NG
Repair
Repair
Replace the engine-A/T-ECU or A/T-
ECU.
A/T overhaul K
D Replace the underdrive
retainer.
Check the trouble symptoms.
NG
Eliminate the cause of the noise.
23-5
clutch