Repair Section
2
–
107
5. TROUBLESHOOTING
5.1 Troubleshooting According to Malfunction Symptom (for TOYOTA Ve-
hicles)
(1) Malfunction Indicator Lamp (MIL) is lit.
Clogged air cleaner element
(2) The engine is hard to start.
Clogged air cleaner element
Description
The check engine warning light is lit when the engine is running, or before the engine is started.
Possible Cause
The DTC is recorded in the engine ECU.
1 Connect the DST-2 and read the DTC. Inspect the check engine warning light circuit.
Troubleshoot the corresponding DTC.
Description
The starter turns at normal speed, but the engine takes too long to start.
Possible Cause
• Start signal circuit
• Glow control system
• Crankshaft position sensor
• Engine ECU power supply circuit
• Injector
• Supply pump
• Cylinder recognition sensor
1 Use the DST-2 to verify whether the coolant
temperature is at the glow system operating
temperature. In addition, verify whether battery
voltage is being supplied to the glow plugs at
the designated times.
Repair the glow control system. (Refer to the
glow control system check procedure issued by
the vehicle manufacturer.)
2 Use the DST-2 to monitor engine speed while
cranking the engine. Verify whether engine
speed is being correctly output.
Check the crankshaft position sensor. (Refer to
the crankshaft position sensor check procedure
issued by the vehicle manufacturer.)
NG
OK
NG
OK
NG
To Next Page
Loading...
