Mitsubishi Eclipse 1990 Service Manual page 447

Scan tool 118
C o d e
72
No.
[Comment]
Background
The PCM monitors the fuel system for compliance with emission standards:'
Range of Check
Engine coolant temperature is greater than
Closed loop operation
Set Condition
The test fails if the fuel control system reduces pulse width by 25% long
and 7% short term compensation due to a rich condition.
05 Engine coolant temperature sensor. (Refer to
SCAN TOOL SENSOR READ
27 Intake air temperature sensor (Refer to
SCAN TOOL SENSOR READ TESTS (Data list)
11 MAP sensor reading (Refer to
SCAN TOOL SENSOR READ TESTS (Data list)
63 Oxygen sensor volts (rear) (Refer to
Transaxle: gear
Drive with wide-open throttle
O K :
SCAN TOOL SENSOR READ TESTS (Data list)
02 Oxygen sensor volts (front) (Refer to
OK: during sudden racing
SCAN TOOL SENSOR READ
Oxygen sensor volts (front) (Refer
Check the following items.
Check the injectors for operation sound.
Check the injectors for leakage.
Check the evaporative emission control system.
Check for contamination (water, kerosene, etc.) in the fuel.
ENGINE (NON-TURBO)>
OK
range
OK
OK
TSB Revision
Wiring
N G
Check the engine coolant temperature circuit.
INSPECTION -PROCEDURE 38.)
NG
Check the intake air temperature circuit. (Refer to
INSPECTION PROCEDURE 39.)
NG
Check the MAP sensor circuit. (Refer to
PROCEDURE
heatedoxygen
PROCEDURE 41.)
INSPECTION PROCEDURE 42.)
OK
Engine coolant temperature
Intake air temperature sensor
Head gasket 'failed
Exhaust manifold cracked ,
, Injectors failed
MAP sensor failed
Heated oxygen sensor failed,
regulator
failed
Incorrect fuel used
PCM failed
.
INSPECTION
circuit.
.
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