BF135A•BF150A
5-68
5. MIL line check
-1. Disconnect the ECM connector B and connect the test
harness B-25 terminal to the engine ground to short-
circuit.
-2. Turn the ignition switch ON and check the MIL.
Does the MIL come ON?
YES –
Go to the step 3.
NO –
Perform “6. Alternator indicator line check”.
-3. Turn the ignition switch ON and measure the voltage
between the test harness B-25 terminal and the
engine ground.
Is there the battery voltage?
YES –
Repair open in the main harness between the
ECM and the MIL.
NO –
-4. Turn the ignition switch OFF and disconnect the MIL
6P connector.
-5. Turn the ignition switch ON.
Measure the No. 2
(Yellow/Red) terminal of the MIL 6P main harness side
connector and the engine ground.
Is there the battery voltage?
YES –
Check the MIL. If it is normal, replace the MIL
harness.
NO –
Perform the troubleshooting of “MIL does not
come ON” (P. 5-61).
6. Alternator indicator line check
-1. Turn the ignition switch OFF and disconnect the alter-
nator 4P connector.
-2. Check for the continuity between the test harness B-19
terminal and the engine ground.
Is there the continuity?
YES –
Repair short in the wire between the ECM
and the alternator.
NO –
Go to the step 3.
-3. Check for the continuity between the No. 1
(White/Blue) terminal of the alternator harness side 4P
connector and the test harness B-19 terminal.
Is there the continuity?
YES –
Substitute a known-good ECM and recheck.
NO –
Repair open in the wire between the ECM
and the alternator.
7. Water level sensor line check
-1. Disconnect the water separator water level sensor 4P
connector.
-2. Check for the continuity between the test harness A-19
terminal and the engine ground.
Is there the continuity?
YES –
Repair short in the main harness between the
water level sensor and the ECM.
NO –
B-25
B-25
B-19
B-19
A-19
MIL HARNESS SIDE
6P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
ALTERNATOR HARNESS
SIDE 4P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
YELLOW/RED
B-19
ACG
(WHITE/BLUE)