TOHATSU BFT75A Service Manual page 284

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IGNITION SYSTEM TROUBLESHOOTING
1. MIL inspection 1
Turn the combination switch ON and check the MIL.
Does the MIL stay on for a few seconds, and then go off?
YES
NO
2. MIL inspection 2
Check the MIL stay on or does not MIL come on.
Does the MIL stay ON or not come on?
Stays on – PGM-FI troubleshooting (page 5-16).
Does not come on – FUSE/ELECTRIC POWER LINE TROUBLESHOOTING (page 4-12).
3. Fuse inspection
Check for a blown No.3 (15 A) fuse and No.5 (15 A) fuse.
Is the fuse blown?
YES
NO
4. Emergency stop switch clip inspection
Check the emergency stop switch clip.
Is the emergency stop switch clip connected?
YES
NO
5. Spark plug inspection
Remove and inspect the spark plug gaps.
Are the spark plug gaps within specification?
YES
NO
6. Spark plug replacement
Replace the spark plugs if necessary.
Restart the engine.
Does the engine start properly?
YES
NO
7. Emergency stop switch signal line short circuit inspection
Turn the combination switch OFF.
Make sure that the emergency stop switch clip is connected.
Disconnect ECM connector A
Check for continuity between engine ground and ECM connector B
(Black/Red) terminal, and No.31 (Black/Red) terminal.
Is there continuity?
YES
NO
– GO TO STEP 3.
– GO TO STEP 2.
– Replace the blown fuse and check for a short in the main wire harness or incorrect load by
referring to the fuse load chart (page 4-13).
– GO TO STEP 4.
– GO TO STEP 5.
– Set the clip securely.
– GO TO STEP 6.
– Replace the iridium spark plug (s) or adjust the standard spark plug gap(s).
– Dirty or faulty original spark plug.
– GO TO STEP 7.
– • Repair short in the main wire harness between the ECM and remote control box or tiller handle.
• Replace the emergency stop switch.
– GO TO STEP 8.
and ECM connector B
IGNITION SYSTEM
.
main wire harness side No.30
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