6. Alternator indicator light check
-1. Turn the ignition switch ON and check the alternator
indicator light.
Does the alternator indicator light come ON?
YES –
Perform “8. Function test”.
NO –
Replace the MIL.
7. MIL line check
-1. Turn the ignition switch OFF and disconnect the ECM
connector B.
-2. Disconnect the MIL 6P connector.
-3. Check for continuity between the No. 25 (Red/Blue)
terminal of the ECM harness side connector B and the
No. 4 (Red/Blue) terminal of the MIL harness side 6P
connector.
Is there the continuity?
YES –
Go to the step 4.
NO –
Repair open in the main harness.
-4. Check for continuity between the No. 4 (Yellow/ Black)
terminal and the No. 6 (Red/Blue) terminal of the MIL
6P connector.
Is there the continuity?
YES –
Substitute a known-good ECM and recheck.
NO –
MIL is faulty or open circuit in the MIL harness
wire.
5-20
BF135A•BF150A
5. MIL power line check
-1. Turn the ignition switch OFF and disconnect the fuse
box 3P connector.
-2. Turn the ignition switch ON. Measure the voltage
between the No. 2 (Yellow/Red) terminal of the fuse
box side 3P connector and the engine ground
Is there the battery voltage?
YES –
Go to the step 3.
NO –
The PGM-FI main relay is faulty.
-3. Turn the ignition switch OFF and connect the fuse box
3P connector.
-4. Disconnect the MIL 6P connector.
-5. Turn the ignition switch ON. Measure the voltage
between the No. 6 (Yellow/Black) terminal of the MIL
6P harness side connector and the engine ground.
Is there the battery voltage?
YES –
Perform “6. Alternator indicator light check”.
NO –
Repair open in the main wire harness.
FUSE BOX SIDE 3P CONNECTOR
YELLOW/RED
VIEWED FROM THE
TERMINAL SIDE
MIL HARNESS SIDE
6P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
MIL HARNESS SIDE
6P CONNECTOR
WARNL
(RED/BLUE)
ECM CONNECTOR B
VIEWED FROM THE
TERMINAL SIDE
YELLOW/BLACK
MIL 6P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
YELLOW/BLACK
RED/BLUE