MPI <4G9> -
Troubleshooting
13A-121
OK
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OK
Replace the engine-ECU <M/T> or en-
gine-A/T-ECU <A/T>.
NG
Repair
OK
Check the harness wire between the
idle speed control servo and the engine-
ECU <M/T> or engine-A/T-ECU <A/T>.
NG
Check the following connector:
A-56
NG
Repair
Measure at engine-ECU <M/T> or en-
gine-A/T-ECU connector B-37 <M/T>,
B-95 <A/T>.
D
Use test harness (MB991709) to
connect the connector, and measure
at the pick-up harness side.
D
The voltage between terminal 4
<M/T> or 14 <A/T> and earth
D
The voltage between terminal 5
<M/T> or 15 <A/T> and earth
D
The voltage between terminal 17
<M/T> or 28 <A/T> and earth
D
The voltage between terminal 18
<M/T> or 29 <A/T> and earth
OK:
The voltage changes as fol-
lows for three seconds when
the ignition switch is turned
ON.
(When using a circuit tester)
5 V and 8 V alternates
(When using an analyzer)
1 V or less and system voltage
alternates.
OK
OK
Check the harness wire between the
engine control relay and the idle speed
control servo, and repair if necessary.
OK
Measure at the idle speed control
servo connector A-56.
D
Disconnect the connector, and
measure at the harness side.
D
Ignition switch: ON
D
The voltage between terminal 2
and earth
D
The voltage between terminal 5
and earth
OK:
System voltage
NG
Check the following connector:
A-56
OK
Check the following connector:
A-56
NG
Repair
OK
Check the idle speed control (ISC)
servo. (Refer to P.13A-26*.)
NG
Replace
OK
Check the throttle body (around the
throttle valve) for contamination.
NG
Clean around the throttle valve.
(Refer to P.13A-22*.)
No
MUT-
II
Self-Diag code
Is any diagnosis code other than No.
P0505 output?
Yes
Refer to P.13A-90, INSPECTION
CHART FOR DIAGNOSIS CODES.
Check intake air hose and intake
manifold for air intake.
NG
Repair