MPI –
Troubleshooting
13-16
Code No. 64 Alternator FR Terminal System
Probable cause
Range of Check
D
Engine speed is approximately 50 r/min or more.
Set conditions
D
Input voltage at the alternator FR terminal is 4.5 V or more for 20 seconds.
D
Open circuit in alternator FR terminal circuit
D
Malfunction of the engine-ECU.
OK
Replace the alternator.
NG
Check the harness wire between
the engine-ECU and alternator
connector.
NG
Repair
OK
Check trouble symptom.
Measure at the alternator connec-
tor
D
Connect the connector.
(Use test harness MB991519.)
D
Voltage between 4 (blue clip)
and earth
(Engine: Idling)
(Radiator fan: Stopped)
(Headlamp: OFF
→
ON)
(Brake lamp: OFF
→
ON)
(Rear defogger switch: OFF
→
ON)
OK: Voltage drops by 0.2 to
3.5 V.
NG
Measure at the alternator connec-
tor A-05.
D
Disconnect the connector, and
measure at the harness side.
D
Voltage between 4 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
NG
Check the following connec-
tors:
B-60, A-88
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between
the engine-ECU and alternator
connector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check the following connector:
A-05
NG
Repair
OK
Replace the engine-ECU.
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