Service Precautions - TOHATSU BFT75A Service Manual

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FUEL SYSTEM

SERVICE PRECAUTIONS

FUEL SYSTEM
GENERAL TROUBLESHOOTING
Before troubleshooting
• First, check the MIL.
• Be sure to turn the combination switch OFF before
disconnecting and connecting the connectors.
• Clear the DTCs after inspection.
– DTC (with the Dr.H: page 5-5)
– MIL (without the Dr.H: page 5-5)
PERMANENT FAILURE
When there is a problem in the system, the MIL will
blink and go off when the engine is turned off.
When there is a permanent failure, the MIL will blink
again when the engine is started again, as the problem
still exists.
Most permanent failures will be indicated when the
combination switch is turned on and engine is started,
while others are indicated only under certain conditions.
MIL will blink constantly until the problem part is fixed or
replaced.
INTERMITTENT FAILURE
When there is an intermittent failure, the MIL will not
blink again when the engine is restarted.
The ECM stores the problem code in its memory.
An intermittent failure is often associated with a loose
connector or poor contact in the circuit.
Opens and Shorts
An open or a short are common electrical terms. An
open is a break in a wire or at a connection. A short is
an accidental connection of a wire to ground or to
another wire. This usually means something will not
work at all. With an ECM, an open or short may cause
something to work, just not the way it is supposed to.
FUEL LINE SERVICE
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when
handling fuel.
• Keep heat, sparks, and flame away.
• Wipe up spills immediately.
• Handle fuel only outdoors.
Disconnect the battery cable from the battery negative
(–) terminal.
Before removing and installing the fuel line, relieve the
fuel pressure by loosening the service check bolt [1] as
described in "How to relieve fuel pressure" (page 5-66).
Replace the sealing washer during reassembly.
5-2
[1]