Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 491

13B-10
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code No. 11 Oxygen sensor (front) system
Range of Check
3 minutes have passed after engine was started.
Engine coolant temperature is approx. 80_C or more.
Intake air temperature is 20 – 50_C.
Engine speed is approx. 2,000 – 3,000 r/min
Vehicle is moving at constant speed on a flat, level road surface
Set conditions
The oxygen sensor (front) output voltage is around 0.6 V for 30 seconds (does
not cross 0.6 V for 30 seconds).
When the range of check operations given above which accompany starting
of the engine are carried out four time in succession, a problem is detected
after each operation.
Check the oxygen sensor (front). (Refer to P.13B-73.)
Measure at the oxygen sensor (front) connector B-34.
Disconnect the connector, and measure at the
harness side.
1. Voltage between 3 and earth (Ignition switch: ON)
OK: System voltage
2. Continuity between 4 and earth
OK: Continuity
Measure at the engine-ECU connector B-30.
Disconnect the connector, and measure at the
harness side.
Voltage between 60 and earth (Ignition switch: ON)
OK: System voltage
Check the following connectors:
B-34, B-30
Check trouble symptom.
Check the harness wire between the engine-ECU and
the oxygen sensor connector.
Replace the engine-ECU.
MPI –
NG
OK
1. NG
2. NG
OK
NG
OK
NG
OK
NG
NG
OK
Troubleshooting
Probable cause
Malfunction of the oxygen sensor (front)
Improper
short-circuited harness wire
Malfunction of the engine-ECU
Replace
Check the harness wire between the
oxygen sensor and the control relay
connector, and repair if necessary.
Check the following connector:
B-30
Check trouble symptom.
Check the harness wire between the
engine-ECU and the oxygen sensor
connector.
Replace the engine-ECU.
Check the following connector:
B-34
Check trouble symptom.
Repair
Check the harness wire between the
engine-ECU and the oxygen sensor
connector, and repair if necessary.
Repair
connector contact, open circuit
NG
Repair
OK
NG
NG
Repair
OK
NG
Repair
OK
NG
or