Mitsubishi MOTORS Space Runner 1998, Руководство по ремонту

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GDI <4G6> -
Troubleshooting
13A-61
INSPECTION PROCEDURE 19
Low alternator output voltage (approx. 12.3 V) Probable cause
The cause is probably a malfunction of the alternator or one of the problems
listed at right.
D Malfunction of the charging system
D Open circuit between the alternator G terminal and
the engine-ECU
D Malfunction of the engine-ECU
NG
Repair
OK
Replace the engine-ECU.
OK
Check the alternator. (Refer to GROUP
16 - Charging System.)
OK
Check the following connectors:
A-30, A-52, B-53
Measure at the alternator connector
A-52.
D Connect the connector. (Use the
test harness MB991519)
D Voltage between 1 (black clip)
and earth
(Engine: Idling)
(Radiator fan: Not operating)
(Headlamp: OFF ® ON)
(Stop lamp: OFF ® ON)
(Rear defogger switch: OFF ®
ON)
OK:
Voltage increased by
0.2 - 3.5 V.
NG
Measure at the alternator connector
A-52.
D Disconnect the connector, and
measure at the harness side.
D Disconnect the engine-ECU
connector.
D Continuity between 1 and earth
OK:
No continuity
NG
Check the harness wire between the
alternator and the engine-ECU, and
repair if necessary.
INSPECTION PROCEDURE 20
Idling speed is improper when A/C is operating Probable cause
If the engine-ECU detects that the air conditioner is on, it activates the idle speed
control (ISC) servo to control idle-up operation.
The A/C-ECU judges if the load caused by air conditioner operation is high or low,
and converts it to voltage signal (high or low voltage) and inputs the signal to the
engine-ECU.
Based on this voltage signal, the engine-ECU controls the idle-up speed (for high
or low load).
D Malfunction of the A/C control system
D Improper connector contact, open circuit or
short-circuited harness wire
D Malfunction of the engine-ECU
NG
Repair
Measure at the engine-ECU connector B-51.
D Connect the connector.
D Voltage between 73 and earth (Engine: at idle, outside air
temperature: 25 _ C or more)
OK:
0 - 3 V [When A/C is MAX. COOL condition (when the
load by A/C is high)]
System voltage [When A/C is MAX. HOT condition (when
the load by A/C is low)]
OK
Check the following connector:
B-51
OK
Check trouble symptom.
NG
Replace the engine-ECU.
NG
Check the A/C system. (Refer to GROUP 55 - On-vehicle Service.)