Electronic Engine Control Input & Output Device Failure Modes
NUMBER ITEM FAILURE MODE CORRECTION
1 CKP
• Engine is hard to start.
• The engine RPM will be limited after the engine starts.
• The highest RPM is less than 3800.
• Excessive exhaust emissions.
• No ignition signal to the ECM.
• The tachometer does not work.
• Rough engine operation.
Replace
2 CMP
• The fuel injector ON time may vary from 720 degrees to 360
degrees.
• The sensor output is not correct, the MIL light will turn on after
the engine starts.
• Engine is hard to start.
• The highest RPM is less than 4000.
Replace
3 APPS
• The MIL light will turn on.
• Poor acceleration.
• The engine RPM will be limited after the engine starts.
Replace
4 ECT
• Engine hard to start when cold.
• Engine hard to start when hot.
• Poor driving capability.
• If the sensor circuit is shorted to power, the engine will run
under the default values.
• The temperature gauge indicates too high.
• The temperature gauge indicates too low.
• The cooling fan operates continuously on high speed.
• The high temperature warning lamp will flash when the IP
indicates low temperature.
Replace
5 MAF
• The cooling fan will operate for approximately 60 seconds on
high speed after the ignition switch is turned off.
• Poor acceleration.
• Poor driving capability.
Replace
6 O
2
Sensor
• Poor fuel economy.
• Excessive exhaust emissions.
• Sluggish acceleration.
• Poor driving capability.
Replace
7 Knock Sensor
• The engine produces an engine knock.
• Overheated engine.
• Excessive exhaust emissions.
• Poor fuel economy.
• Lack of engine power.
• Internal engine damage.
Replace
8 ECM
• Unstable engine idle.
• Poor acceleration.
• Unable to start.
• High engine idle.
• The engine exhaust exceeds emission standards.
• Engine is hard to start.
• Air conditioner does not operate.
• Fuel injector control failure.
• Engine stalls out.
Replace
9 Ignition Coil
• Unstable idle.
• Lack of engine power.
• Poor fuel economy.
• Excessive exhaust emissions.
• Weak spark.
Replace
GENERAL INFORMATION
03–4
Chery Automobile Co., Ltd.
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