Pgm-Fi Main Relay Harness; Inspection - Honda BF135A Manual

• PGM-FI Main Relay Harness Inspection
Check with test harness:
1. Turn the ignition switch OFF and disconnect each con-
nector from the PGM-FI main relay.
2. Connect the test harness.
• Disconnect the connector A, B and C from the ECM.
3. Check for the continuity between the No.6 (Black) ter-
minal of the harness side 6P connector and the engine
ground.
HARNESS SIDE 6P
CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Repair short in the wire between the PGM-FI
main relay and the engine ground.
NO – Go to the step 4.
4. Measure the voltage between the No.3 (White/Yellow)
terminal of the fuse box side 4P connector and the
engine ground.
FUSE BOX SIDE
4P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the battery voltage?
YES – Go to the step 5.
NO – Blown No.7 (30A) fuse, or open in the wire
between the fuse box and the PGM-FI main
relay.
5-97
BLACK
WHITE/YELLOW
5. Turn the ignition switch ON. Measure the voltage
between the No.2 (Black/Yellow) terminal of the PGM-
FI main relay harness side 6P connector and the
engine ground.
PGM-FI MAN RELAY HARNESS
SIDE 6P CONNECTOR
BLACK/YELLOW
VIEWED FROM THE TERMINAL SIDE
Is there the battery voltage?
YES – Go to the step 6.
NO – Blown No.3 (10A) fuse, or faulty ignition
switch, or open in the wire between the PGM-
FI main relay and the ignition switch.
6. Measure the voltage between the No.2 (White/Yellow)
terminal of the harness side 2P connector and the
engine ground.

PGM-FI MAIN RELAY HARNESS

SIDE 2P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the battery voltage?
YES – Go to the step 7.
NO – Blown No.3 (10A) fuse, or faulty ignition
switch, or open in the wire between the PGM-
FI main relay and the ignition switch.
7. Check for the continuity between the No.4 (White/
Black) terminal of the fuse box side 4P connector and
the respective terminals of the C-1 and C-5 terminals
of the test harness.
FUSE BOX SIDE 4P
CONNECTOR
WHITE/BLACK
VIEWED FROM THE TERMINAL SIDE
BF135A•BF150A
WHITE/YELLOW
C-1
C-5