Repair Section
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109
(3) The engine stalls when idling.
Clogged air cleaner element
Description
The engine stalls after starting or when idling.
Possible Cause
• Crankshaft position sensor
• Engine ECU power supply circuit
• Injector
• Supply pump
• Engine cooling system
• Start signal circuit
1 Verify that the engine is not overheated. Repair the engine cooling system.
2 Check the crankshaft position sensor output
waveform. (Refer to the crankshaft position sen-
sor check procedure issued by the vehicle man-
ufacturer.)
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 Verify whether there is a start signal when
cranking the engine by checking the engine
ECU start signal terminal.
Repair the start signal circuit.
5 Check the engine ECU power supply. (Refer to
the engine ECU power supply circuit diagram
issued by the vehicle manufacturer.)
Repair the engine ECU power supply.
6 Check the supply pump and the supply pump
drive circuit. (Refer to the supply pump drive cir-
cuit diagram issued by the vehicle manufac-
turer.)
Repair or replace the supply pump and drive cir-
cuit.
Troubleshooting complete
NG
OK
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OK
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OK
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