TRBL
SHTG
Troubleshooting
9-19
6C13G11
Symptom 3: Engine speed not stable at low speeds or hunting occurs.
Check the water pump.
Replace the cooling water tem-
perature sensor.
No
Yes
Out of specification?
Replace the water pump.
Good condition?
Check the ignition system, fuel
system, or lubrication system.
Yes
No
Yes
Repair or replace the defective
parts.
No
Check the throttle valve open-
ing.
Check the ignition system or
fuel system.
Replace the throttle body.
Good condition?
Yes
No
Is the throttle
valve opening
incorrect or is the
throttle valve link
worn?
Check the throttle position sen-
sor and idle speed control and
check that the connectors are
securely connected.
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