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(3) Diagnosis procedure for insufficient engine power (Figure 150)
2. Poor deceleration
(1) Symptom
Idling is normal, but the engine is frequently turned off upon sudden release of the accelerator pedal
during driving.
(2) Causes and Troubleshooting:
a. Throttle position sensor is damaged and shall be replaced;
b. Initial idling is not properly adjusted or automatic idle control is wrong, fuel cut RPM is too low,
ECU fault, repair or replace them.
Insufficient power
Insufficient
Check whether throttle valve can be fully open
Unable to be fully open
Adjust
OK
Check whether the air cleaner is clogged
Clogged
Clean or replace
OK
Check the throttle valve position sensor for failure
Abnormal
Repair or replace
OK
Check the water temperature switch and thermostat
NG
Replace
OK
Check the vacuum pressure sensor for failure
NG
Replace
OK
Check the fuel pressure
Excessively low or high
Service the electric fuel pump,
fuel filter and fuel pressure regulator
OK
Check the oxygen sensor
Incorrect
Replace
OK
Check the injector
Incorrect
Replace
OK
Replace the spark plug, ignition coil and high voltage wire
OK
Disassemble the engine
Figure 150
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