MPI <4G1> -
Troubleshooting
13A-14
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
To the next page
OK
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU.
NG
Repair
NG
NG
Repair
Check the following connector:
B-34
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU, and repair if
necessary.
NG
Repair
MUT-
II
Data list
21 Engine coolant temperature
sensor
OK:
When the engine is cold,
the temperature is roughly
the same as ambient tem-
perature. If warm, it is 80 -
120
_
C.
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
Replace
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 connector
B-34.
D
Measure the voltage at the
engine-ECU terminal.
D
Disconnect connector A-72.
D
Ignition switch: ON
D
Voltage between terminal 44 and
earth
OK:
4.8 - 5.2 V
OK
Check the following connector:
B-34
OK
Check the following connector:
A-72
NG
Repair
(2) NG
OK
Repair
NG
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU.
NG
Repair
Measure at engine coolant
temperature sensor connector A-72.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between terminals 1
and 2
OK:
At 20
_
C of engine coolant
temperature: 2.1 - 2.7 k
W
At 80
_
C of engine coolant
temperature: 0.26 - 0.36
k
W
Check the following connector:
B-34