MPI <4G9> -
Troubleshooting
13A-99
OK
Measure at engine coolant
temperature sensor connector A-72.
D
Use test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
D
Ignition switch: ON
D
Voltage between terminal 1 and
earth
OK:
At 0
_
C of engine coolant
temperature: 3.2 - 3.8 V
At 20
_
C of engine coolant
temperature: 2.3 - 2.9 V
At 40
_
C of engine coolant
temperature: 1.3 - 1.9 V
At 80
_
C of engine coolant
temperature: 0.3 - 0.9 V
NG
Check the engine coolant
temperature sensor.
(Refer to P.13A-174*.)
NG
Repair
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the following connectors:
A-72, B-34 <M/T>, B-94 <A/T>
NG
Repair
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
OK
Measure at engine coolant
temperature sensor connector A-72.
D
Disconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 2
and earth
OK:
2
W
or less
(1) NG
Measure at engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector
B-34 <M/T>, B-94 <A/T>.
D
Measure the voltage at the
engine-ECU <M/T> or
engine-A/T-ECU terminal <A/T>.
D
Disconnect connector A-72.
D
Ignition switch: ON
D
Voltage between terminal 83
<M/T>, 44 <A/T> and earth
OK:
4.8 - 5.2 V
OK
Check the following connector:
B-34 <M/T>, B-94 <A/T>
NG
Repair
NG
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
(2) NG
OK
Repair
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
Repair
NG
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connector:
B-34 <M/T>, B-94 <A/T>
Check the following connector:
A-72
From the previous page
NOTE:
*: Refer to the ’96 COLT/LANCER Workshop Manual (Pub. No. PWME9511).