5-26
BF135A•BF150A
• Neutral Switch Malfunction
• Before following test, perform the neutral position check.
Engine speed does not increase in gears (BF150A only).
1. Switch condition check with the HDS pocket tester
-1. Turn the ignition switch OFF and connect the HDS
pocket tester.
-2. Turn the ignition switch ON and check the neutral
switch condition using the HDS pocket tester.
Does the switch position agree with the indication of
the tester?
YES –
Substitute a known-good ECM and recheck.
NO –
Perform “2. Neutral switch line check”.
2. Neutral switch line check
-1. Turn the neutral switch OFF and disconnect the neutral
switch 2P connector.
-2. Check for the continuity between the No. 1 (Black/Blue)
terminal of the neutral switch harness side 2P connec-
tor and the engine ground.
Is there the continuity?
YES –
Repair short in the wire of the main harness.
NO –
Go to the step 3.
-3. Check for the continuity between the No. 2 (Black) ter-
minal of the neutral switch harness side 2P connector
and the engine ground.
Is there the continuity?
YES –
NO –
Repair open in the main wire harness.
-4. Disconnect the ECM connector B.
-5. Check for the continuity between the No. 13
(Black/Blue) terminal of the ECM harness side con-
nector B and the No. 1 (Black/Blue) terminal of the
neutral switch harness side 2P connector.
Is there the continuity?
YES –
Perform “3. Neutral switch check”.
NO –
Repair open in the main harness.
3. Neutral switch check
-1. Turn the ignition switch OFF and disconnect the neu-
tral switch 2P connector.
-2. Check for the continuity between the No. 1 (Black) ter-
minal and the No. 2 (Black/Blue) terminal of the neutral
switch side 2P connector.
Is there the continuity with the gear in Neutral and
no continuity with the gear in other than Neutral?
YES –
Substitute a known-good ECM and recheck.
NO –
The neutral switch is faulty.
VIEWED FROM THE
TERMINAL SIDE
BLACK/BLUE
NEUTRAL SWITCH HARNESS
SIDE 2P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
NEUTRAL SWITCH HARNESS
SIDE 2P CONNECTOR
NEUTRAL SWITCH
HARNESS SIDE 2P
CONNECTOR
ECM CONNECTOR B
VIEWED FROM THE
TERMINAL SIDE
VIEWED FROM THE
TERMINAL SIDE
NEUTRAL SWITCH SIDE 2P
CONNECTOR
BLACK
NTSW
(BLACK/BLUE)