Repair Section
2
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117
(10) Knocking, abnormal noise
Clogged air cleaner element
Description
Abnormal combustion occurs, and a knocking sound is generated.
Possible Cause
• Engine
• Injector
• Glow control system
• Crankshaft position sensor
1 Repair the glow control system. (Refer to the
glow control system check procedure issued by
the vehicle manufacturer.)
Repair the glow control system.
2 Check the crankshaft position sensor. (Refer to
the crankshaft position sensor check procedure
issued by the vehicle manufacturer.)
Repair or replace the crankshaft position sensor
and/or the corresponding circuit.
3 Check each injector. (Refer to the injector check
procedure issued by the vehicle manufacturer.)
Repair or replace the injector and/or the corre-
sponding circuit.
4 Check engine parts that may be a source of
abnormal combustion.
Repair the engine.
Troubleshooting complete
NG
OK
NG
OK
NG
OK
NG
OK
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