MPI <4G9> -
Troubleshooting
13A-146
INSPECTION PROCEDURE 24
Fans (radiator fan, A/C condenser fan) are inoperative
Probable cause
The engine-ECU <M/T> or engine-A/T-ECU <A/T> outputs a duty signal to the
fan controller depending on the engine coolant temperature, vehicle speed, and
air conditioner switch condition.
Based on this signal, the fan controller controls the radiator fan and condenser
fan speeds (The more the average voltage at the terminal approaches 5 V, the
higher the fan speed become.)
D
Malfunction of the fan motor relay
D
Malfunction of the fan motor
D
Malfunction of the fan controller
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T>
OK
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
NG
MUT-
II
Data list
21 Engine coolant temperature sensor
OK:
After the engine has been warmed up, the engine
coolant temperature during idling is identical to the
MUT-
II
reading.
NG
Check the engine coolant temperature sensor system. (Refer to
P.13A-98, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0115.)
OK
Check the radiator fan
and condenser fan circuit.
(Refer to GROUP 14 -
Troubleshooting.)
NG
Repair
Check the harness wire
between the engine-ECU
<M/T>
or
engine-
A/T-ECU <A/T> and the
fan controller connector.
NG
OK
Check the trouble symp-
tom.
OK
Check the trouble symp-
tom.
OK
Check the following
connector:
A-15X
NG
Repair
Measure at the engine-ECU connector B-37 <M/T> or the
engine-A/T-ECU connector B-95 <A/T>.
D
Disconnect the connector, and measure at the harness
side.
D
Voltage between 21 <M/T>, 18 <A/T> and earth (Ignition
switch: ON)
OK:
4.8 - 5.2 V (Fan rotates at high speed.)
D
Connect a jumper cable between 21 <M/T>, 18 <A/T> and
earth (Ignition switch: ON)
OK:
Fan stops
NG
Check the following
connectors:
B-36
<M/T>, B-93 <A/T>
NG
Repair
OK
Check the thermostat.
NG
Replace
Содержание Colt 2000
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