Denso CRS - Page 120

Repair Section
2
–
115
(9) Poor engine output, poor acceleration
Clogged air cleaner element
Description
Deficient engine performance.
Possible Cause
• EGR system
• Injector
• Mass Air Flow (MAF) meter
• Crankshaft position sensor
• Accelerator position sensor
• Boost pressure sensor
• Supply pump
• Start signal circuit
• Air cleaner, duct
1 Check for air cleaner clogging and/or damage. Replace the air cleaner or repair the air duct.
2 Verify that the engine is not overheated. Repair the engine cooling system.
3 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.
4 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.
5 Verify whether there is a start signal when
cranking the engine by checking the engine
ECU start signal terminal.
Repair the start signal circuit.
6 Check the MAF meter and the corresponding
circuit. (Refer to the MAF meter check proce-
dure issued by the vehicle manufacturer.)
Repair or replace the MAF meter and/or the cor-
responding circuit.
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK