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MPI SYSTEM
1.
Connect the voltmeter to the self diagnosis connector.
2.
Turn the ignition switch, and the engine control unit memory
contents will immediately start.
After recording the abnormal item, check and repair each
part according to the check items in "Diagnosis Chart".
3.
When the defective parts have been repaired, disconnect the
negative terminal of the battery cable for 15 seconds or more
and connect it again to make sure that the trouble code has
been erased.
Inspection Procedure (Using Voltmeter)
Y31DYOA
MPI diagnosis
Ground
I
I
I
I
I
I
L
31Y061
Diagnosis Chart
Y310Z0A
Output
Diagnosis
Trouble code
preference
Check item (Remedy)
order
item
Output signal pattern
No.
Memory
1
Engine
-
-
(Replace engine control unit)
control
unit
:~
J1Y062
2
Oxygen
11
Retained
o Harness and connector
sensor
0
Fuel pressure
:JLL
0
Injectors
(Replace if defective.)
o Intake air leaks
31Y063
o Oxygen sensor
3
Air flow
12
Retained
o Harness and connector
sensor
(If harness and connector
:JLJUL
are normal, replace air flow
sensor assembly.)
J1Y064
31-41
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