Honda BF135A Manual page 172

3. IGP power line check
-1. Turn the ignition switch OFF. Disconnect the PGM-FI
main relay 6P connector.
-2. 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 MAIN RELAY HARNESS
SIDE 6P CONNECTOR
BLACK/YELLOW
VIEWED FROM THE
TERMINAL SIDE
Is there the battery voltage?
YES – Go to the step 3.
NO – Repair open in the main harness.
-3. Turn the ignition switch OFF. Check for continuity
between the No. 6 (Black) terminal of the PGM-FI main
relay 6P connector and the engine ground.
PGM-FI MAIN RELAY HARNESS
SIDE 6P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
Is there the continuity?
YES – Perform "4. ECM power line check".
NO – Repair open in the main harness (Black).
5-19
BLACK
4. ECM 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. 3 (Yellow/Black) terminal of the fuse
box side 3P connector and the engine ground.
FUSE BOX SIDE 3P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
Is there the battery voltage?
YES – Go to the step 3.
NO – The PGM-FI main relay is faulty, or the fuse
box is faulty.
-3. Turn the ignition switch OFF and disconnect the ECM
connector C.
-4. Check for the continuity between the No. 2 (Yellow/
Black) terminal of the fuse box harness side 3P con-
nector and the respective terminals of the No. 1
(Yellow/Black) and No. 5 (Yellow/Black) terminals of
the ECM connector C.
ECM CONNECTOR C
IGP2
(YELLOW/BLACK)
IGP1
(YELLOW/BLACK)
VIEWED FROM THE
TERMINAL SIDE
Is there the continuity?
YES – Perform "5. MIL power line check".
NO – Repair open in the wire of the main harness.
BF135A•BF150A
YELLOW/BLACK
FUSE BOX HARNESS
SIDE 3P CONNECTOR
YELLOW/BLACK