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Failure phenomenon
Unstable engine speed
or no idle speed, fuel
return and flameout
Engine idling too high
Insufficient engine
power
The speed does not go
up during acceleration
or the reaction is slow
during flameout
acceleration
Poor performance and
powerlessness during
acceleration
Engine vomiting,
unstable speed
Excessive fuel
consumption
When using other
electrical loads, the idle
speed is poor or the
engine stalls
Possible causes
进气压力传感器及软管故障；
Intake pressure sensor and hose failure;
Water temperature sensor failure;
Idle stepper motor fault;
Poor line connection or poor grounding;
ECU failure;
Incorrect fuel grade, deterioration or water
content.
The throttle line does not reset;
Oil pump pressure regulator failure;
Intake air temperature sensor failure;
Idle stepper motor and connecting pipe fault.
Engine mechanical failure;
Air filter blocked or throttle body, intake pipe
leakage;
exhaust system and three-way catalytic
converter blocked;
Ignition coil, high voltage wire or spark plug
fault;
Oil pump or oil supply pipeline fault;
Fuel injector blockage or failure;
The signal of each sensor is abnormal;
Poor line connection or poor grounding;
ECU failure.
The engine cylinder pressure is insufficient;
Ignition coil, high voltage wire or spark plug
fault;
Phase sensor and circuit fault
Oil pump or oil supply pipeline fault:
Fuel injector blockage or failure;
ECU failure.
Other electrical load is too large or intermittent
short circuit makes the battery voltage unstable;
The short circuit between the system line and
other load lines makes the system signal
voltage unstable.
Solutions:
Replace the intake pressure sensor
or connecting pipe;
Replace the water temperature
sensor;
Replace the idle stepper motor and
its pipeline;
Check and connect the circuit;
Re plug or replace ECU;
Replace the qualified fuel.
Adjust the throttle line and idle
screw;
Replace the pressure regulator;
Replace the intake air temperature
sensor;
。
Replace the idle stepper motor.
Maintain the mechanical part of
engine;
Repair air filter, throttle body or
intake pipe:
Replacement or cleaning:
Maintenance or replacement;
Maintenance or replacement;
Clean or replace;
Replace the failed sensor;
Check and connect the circuit;
Re plug or replace ECU.
Maintain the mechanical part of
engine;
Maintenance or replacement;
Maintenance or replacement;
Maintenance or replacement;
Clean or replace;
Re plug or replace ECU.
Replace other electrical loads;
Check and re connect the wiring.
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