MPI <4G9> -
Troubleshooting
13A-104
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the following connector:
B-34 <M/T>, B-93 <A/T>
Repair
NG
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
NG
Check the following connectors:
A-106, B-34 <M/T>, B-93 <A/T>
NG
Repair
OK
Measure at engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector
B-34 <M/T>, B-93 <A/T>.
D
Measure the voltage at the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> terminal.
D
Engine: 2,500 r/min (after
warming up)
D
Voltage between terminal 76
<M/T>, 71 <A/T> and earth
OK:
0 V and 0.8 V alternate.
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
OK
NG
Repair
Check the following connectors:
A-106, B-34 <M/T>, B-93 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
(1) NG
Check the following connectors:
A-106, B-34 <M/T>, B-94 <A/T>
NG
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
Repair
Repair
OK
Measure at oxygen sensor (front)
connector A-106.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between terminal 2
and earth
OK:
2
W
or less
NG
Check the following connectors:
A-106, B-34 <M/T>, B-94 <A/T>
NG
Check the following connector:
A-106
NG
Repair
(2) NG
Check the oxygen sensor (front).
(Refer to P.13A-85*.)
NG
Replace
OK
Measure at oxygen sensor (front)
connector A-106.
D
Use the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.
D
Engine: 2,500 r/min (after
warming up)
(1) Voltage between terminal 2 and
earth
OK:
0.5 V or less
(2) Voltage between terminal 4 and
earth
OK:
0 V and 0.8 V alternate.
NOTE
*: Refer to the ’96 COLT/LANCER Workshop Manual (Pub. No. PWME9511).