Sakai SW300-1, Shop Manual

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10-010
TROUBLESHOOTING
3) Connector inspection
• Is a connector disconnected or loose?
• Check that pins are not snapped or corroded.
• If faulty contact is suspected
Turn the starter switch OFF. Then disconnect and check the connectors (including relay and switch
sockets).
If the terminal has no luster, faulty contact due to oxidation can be suspected. Therefore, polish the terminal
by inserting and removing the connector (relay, switch) repeatedly at least
fi ve times. (Luster will return.)
4) Relay inspection (Check ON/OFF operation by sound.)
• Conduct without running the engine. (If you run the engine, you cannot hear the sound of operation.)
Sound heard : A relay failure occurred.
No sound heard : Using a tester, check the harness.
Sound heard : A relay failure occurred.
Still no sound : Using a tester, check the harness.
Continuity : Turn the starter switch OFF temporarily, disconnect the relay and check
for continuity between the harness-side grounding terminal (color: black)
and vehicle body ground. (If there is none, replace the harness.)
Voltage : With the relay disconnected, turn the starter switch ON and turn the
operating switch ON. 24 V (or 12 V) (between vehicle body ground) should
not reach the relay coil input terminal. Con
fi rm this. Identify the location
(section) to which 24 V (or 12 V) reaches. Then replace the harness or
take other action.
5) Solenoid valve inspection (Check ON/OFF operation by sound.)
• Conduct without running the engine. (If you run the engine, you cannot hear the sound of operation.)
Sound heard : The electrical system is normal.
No sound heard : Check with a tester.
Continuity
: ① Turn the starter switch OFF temporarily, disconnect the connector and
check for continuity between the harness-side grounding terminal (color:
black) and vehicle body ground. (If there is none, replace the harness.)
:
②
Is the solenoid valve coil burnt?
(Turn the starter switch OFF, disconnect the connector and check the
resistance between the solenoid valve terminals.)
Voltage : With the connector disconnected, turn the starter switch ON and check
whether 24 V (or 12 V) exists between the harness-side connector and
vehicle body ground.
If YES : Replace the valve.
If NO : Investigate and identify the location (section) to which 24 V (or 12 V)
reaches. Then replace the harness or take other action.
6) Harness check
• If an incomplete disconnection inside the harness is suspected, wiggle (move) the harness during the relay
inspection and solenoid valve inspection to see whether the relay (valve) operates incorrectly.
• Check for burned areas of the harness.
• Turn the starter switch OFF, disconnect the connector and check the continuity, referring to the circuit
diagram and wiring coloring.
10̲TROUBLESHOOTING̲oku.indd 10-010 10̲TROUBLESHOOTING̲oku.indd 10-010 2012/11/14 20:25:56 2012/11/14 20:25:56