MPI <4G9> -
Troubleshooting
MPI <4G9> -
Troubleshooting
13A-101
OK
Check the harness wire between
throttle position sensor and the
engine-ECU <M/T> engine-A/T-ECU
<A/T>.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the harness wire between
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
OK
Check the following connector:
B-34 <M/T>, B-94 <A/T>
NG
Repair
OK
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 <A/T> terminal.
D
Ignition switch: ON
D
The voltage between terminal 84
<M/T> or 78 <A/T> and earth
OK:
Accelerator pedal fully re-
leased: 0.3 - 1.0 V
Accelerator pedal fully de-
pressed: 4.5 - 5.5 V
NG
Check the following connector:
B-34 <M/T>, B-94 <A/T>
NG
Repair
OK
Measure at throttle position sensor
connector A-05.
D
Use test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.
D
Ignition switch: ON
(1) The voltage between terminal 1
and earth
OK:
4.8 - 5.2 V
(2) The voltage between terminal 4
and earth
OK:
0.5 V or less
(3) The voltage between terminal 2
and earth
OK:
Accelerator pedal fully re-
leased: 0.3 - 1.0 V
Accelerator pedal fully de-
pressed: 4.5 - 5.5 V
(1), (2) NG
NG
Repair
Check the following connector:
B-34 <M/T>, B-94 <A/T>
NG
Repair
From the previous page
(3) NG
Adjust the throttle position sensor.
(Refer to P.13A-22*.)
OK
Check the harness wire between
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
B-34 <M/T>, B-94 <A/T>
NOTE
*: Refer to the 2000 COLT/LANCER Workshop Manual (Pub. No. PWME9511-B).
Code No. P0125 Feedback system
Probable cause
Range of Check
D
The engine coolant temperature is approx. 80
_
C or more.
D
During stoichiometric feedback control
D
The vehicle is not being decelerated.
Set Conditions
D
Oxygen sensor (front) output voltage has been higher or lower than 0.5 V for
at least thirty seconds.
D
Malfunction of oxygen sensor (front)
D
Open or short circuit in the oxygen sensor (front)
circuit or loose connector contact
D
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>