ENGINE DIAGNOSIS (C22NE, 22LE, 20LE) 6-11
Abnormal Combustion
Condition Possible cause Correction
Trouble in fuel injection system Fuel pressure control valve
defective
Replace
Fuel filter clogged Replace
Fuel pump clogged Clean or replace
Fuel tank or fuel pipe clogged Clean or replace
Fuel injector clogged Clean or replace
Fuel pump relay defective Replace
Power supply cable for fuel pump
loosely connected or defective
Reconnect, correct or replace
Manifold Absolute Pressure
Sensor circuit open or shorted
Correct or replace
Manifold Absolute Pressure
Sensor defective
Replace
Engine Coolant Temperature
(ECT) Sensor circuit open or
shorted
Correct or replace
ECT Sensor defective Replace
Throttle Position Sensor
adjustment incorrect
Reconnect
Throttle Position Sensor defective Replace
Throttle Position Sensor connector
loosely connected
Reconnect
Vehicle Speed Sensor cable
loosely connected or defective
Correct or replace
Vehicle Speed Sensor loosely
fixed
Fix tightly
Vehicle Speed Sensor in wrong
contact or defective
Replace
Engine Control Module cable
loosely connected or defective
Correct or replace
Trouble in emission control
system
Heated Oxygen Sensor circuit
open (If applicable)
Correct or replace
Heated Oxygen Sensor defective
(If applicable)
Replace
Signal vacuum hose loosely fitted
or defective
Correct or replace
ECT Sensor circuit open or
shorted
Correct or replace
ECT Sensor defective Replace
Evaporative Emission Control
system (If applicable)
Refer to Section 6E
Trouble in ignition system - Refer to "Engine Lacks Power"
Trouble in cylinder head parts Carbon deposits in combustion
chamber
Remove carbon
Carbon deposit on valve, valve
seat and valve guide
Remove carbon
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