MPI <4G1> -
Troubleshooting
13A-30
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the harness wires between
the crank angle sensor and the
engine-ECU, crank angle sensor and
the engine control relay, and the
crank angle sensor and earth. Then,
repair if necessary.
NG
Check the following connectors:
B-13, B-34
NG
Repair
Check the trouble symptoms.
OK
Replace the crank angle sensor.
NG
Check the crank angle sensor vane
NG
Replace
OK
Use an analyzer to measure the
output waveform at the crank angle
sensor connector A-84.
D
Use the test harness
(MD998478) to connect the
connector, and measure at the
pick-up harness side.
D
Engine: Idling
D
The voltage between terminal 2
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-72 (Inspection
Procedure Using an Ana-
lyzer). Its maximum value
should be 4.8 V or more,
and its minimum value
should be 0.6 V or less
with no noise in waveform.
OK
Check the harness wire between the
crank angle sensor and the engine
control relay, and repair if necessary.
Check the following connector:
B-13
NG
Repair
(3) NG
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness wire between the
crank angle sensor and the
engine-ECU.
NG
Repair
NG
Check the following connector:
B-34
NG
Repair
OK
Check the harness wire between the
crank angle sensor and the
engine-ECU, and repair if necessary.
NG
Repair
OK
Check the following connector:
B-34
(2) NG
Measure at engine-ECU connector
B-34.
D
Measure the voltage at the
engine-ECU terminal.
D
Disconnect the connector A-84
D
Ignition switch: ON
D
The voltage between terminal 89
and earth.
OK:
4.8 - 5.2 V
(1) NG
Check the harness between the
crank angle sensor and earth, and
repair if necessary.
OK
Measure at the crank angle sensor
connector A-84.
D
Disconnect the connector and
measure at the harness side.
(1) The resistance between terminal
1 and earth
OK:
2
W
or less
(2) The voltage between terminal 2
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(3) The voltage between terminal 3
and earth
(Ignition switch: ON)
OK:
System voltage
NG
Check the following connector:
A-84
NG
Repair
MUT-
II
Data list
22 Crank angle sensor
OK:
Refer to P.13A-65, DATA
LIST REFERENCE TABLE.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)