MPI <4G6> -
Troubleshooting
13A-43
Code No. P1500 Alternator FR terminal system Probable cause
Range of Check
D
Engine speed: 50 r/min or more
Set Conditions
D
Input voltage from the alternator FR terminal is system voltage for 20
seconds.
D
Open circuit in alternator FR terminal circuit
D
Malfunction of engine-ECU <M/T>
D
Malfunction
of
engine-A/T
-ECU
<A/T>
NG
Replace the engine-ECU <M/T> or
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.
NG
Replace the alternator.
OK
Check the trouble symptoms.
OK
Check the harness wire between the
alternator connector and the
engine-ECU <M/T> or
NG
Repair
NG
Check the following connectors:
C-36
<M/T>,
C-176
<A/T>,
B-31
NG
Replace
OK
Measure at alternator connector
B-38.
D
Use test harness (MB991519) to
connect the connector, and
measure at the pick-up harness.
D
Engine: Idling (After warming up)
D
Radiator fan: Not operating
D
The voltage between terminal 4
and earth
OK:
The voltage drops when
the headlamps are turned
on.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
OK
Check the harness wire between the
intermediate connector and the
engine-ECU <M/T> or
NG
Repair
NG
Check the following connector:
NG
Repair
OK
Check the harness wire between the
intermediate connector and the
engine-ECU <M/T> or
engine-A/T
-ECU
<A/T>,
and
repair
if
necessary.
NG
Repair
NG
Check the following connectors:
C-36
<M/T>,
C-176
<A/T>,
B-31
NG
Measure at engine-ECU connector
C-36 <M/T> or engine-A/T-ECU
D
Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T
-ECU
terminal
<A/T>.
D
Ignition switch: ON
D
The voltage between terminal 52
<M/T>,
54
<A/T>
and
earth
OK:
9 - 10 V
OK
Measure at alternator connector
B-38.
D
Use test harness (MB991519) to
connect the connector, and
measure at the pick-up harness.
D
Ignition switch: ON
D
The voltage between terminal 4
and earth
OK:
9 - 10 V
Check the following connector:
B-38
NG
Repair
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