Chery Tiggo 2009 Service Manual page 570

9.
CHECK MAF SENSOR SIGNAL
• Install all removed parts.
• Start engine.
• Check MAF sensor signal with the X-431.
ECM
ITEM
TERMINAL
NO.
Air
37 flow
sensor
• If without the X-431, check voltage between MAF sensor terminal 5 and ground.
ECM
ITEM
TERMINAL
NO.
Air
37 flow
sensor
• If the signal voltage is out of specification, proceed with the following.
• Check for the causes of uneven air flow through the MAF sensor.
− Crushed air ducts
− Air cleaner seal
− Uneven dirt of air cleaner element
• If the parts malfunctioning, repair or replace them.
• If the parts OK, clean the MAF sensor, then check the signal of the MAF sensor.
Is the signal voltage of MAF normal?
Yes >>
Go to the next step.
No >>
Replace MAF sensor.
286
03–
DIAGNOSIS & TESTING
CONDITION DATA
• Engine is
Approximately
running
322 kg/h
• ECT: 78°C
• Idle: 795
RPM
• IAT: 36°C
• IAT signal
Approximately
voltage:
1.39 V
1.88 V
DATA
(AVERAGE
CONDITION
DC
VOLTAGE)
• Engine is
running
• ECT: 78°C
• Idle: 795
Approximately
RPM 1.39 V
• IAT: 36°C
• IAT signal:
1.88 V
Chery Automobile Co., Ltd.