Mitsubishi Eclipse 1990 Service Manual page 454

Scan tool 138
Code General scan tool
No.
25
[Comment]
Range of Check
Engine:
Vehicle at rest and the brake applied
Set Condition
speed differs from target idle by 200
SCAN TOOL SENSOR READ TESTS (Data list)
12 position (Refer to
Check the throttle body minimum air flow. (Refer to
Code General scan tool High Speed Radiator Fan Control
No.
[Comment]
Background
The high speed radiator fan relay controls the high speed operation of the radiator fan.
One side of the relay control coil is supplied with 12 volts when the
turned to the ON position.
The circuit is completed when the other side of the relay coil is grounded by the PCM.
The PCM grounds the relay control circuit depending on engine coolant temperature and/
or A/C compressor condition, etc.
Range of Check
Battery voltage: 10 or more
Ignition switch: ON
Set Condition
An open or shorted condition is detected in the high speed radiator fan relay control circuit
for 3 seconds.
Measure at the PCM connector
Disconnect the connector, and measure at
Voltage between 69 and ground
(Ignition switch: ON)
OK: Battery positive voltage
Connect a jumper wire between 69 and ground
(Ignition switch: ON)
OK: Radiator fan runs at high speed.
Check the following connector:
Check trouble symptom.
Replace the PCM.
ENGINE
Not
for 12 seconds.
Relay
harness side.
OK
OK
1
NG
TSB Revision
Troubleshooting
.
Check the air control motor. (Refer to
Probable cause
switch is
NG
Check the radiator fan circuit.
.
N G
Repair
Idle air control motor failed
motor related circuit
OK
Relay open or
Ignition switch output
Low speed radiator fan relay control circuit
open or shorted
,
,
.
.