Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 380

Code No. 24 Vehicles speed sensor system
Range of check
Ignition switch: ON
Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
Engine speed is 3,000 r/min or more.
Driving under high engine load conditions.
Set conditions
Sensor output voltage does not change for 4 seconds (no pulse signal input).
Does the speedometer operate normally?
Measure at engine-ECU connector B-31.
Connect the connector.
Voltage between terminal 86 and earth
(Ignition switch: ON)
OK: If the vehicle is moved forward without starting the engine,
0 V and system voltage alternates.
Check the following connector: A-71, B-19
OK
Check trouble symptom.
Check the harness wire between the vehicle speed sensor and
engine-ECU, and repair if necessary.
GDI –
Yes
NG
NG
Repair
NG
Troubleshooting
Probable cause
Malfunction of the vehicle speed sensor
Improper
short-circuited harness wire of the vehicle speed
sensor circuit
Malfunction of the engine-ECU
No
Check the vehicle speed sensor circuit. (Refer to GROUP 54
– Combination Meter.)
OK
Check the following connector: B-31
OK
Check trouble symptom.
Replace the engine-ECU.
13A-21
connector contact, open circuit
NG
Repair
NG
or