1A-72 Engine General Information and Diagnosis:
6
Wire circuit check
1) Measure resistance between “C37-25” terminal of ECM
connector and “BLK/YEL” wire terminal of MAF and IAT
sensor connector with ignition switch turned OFF.
Is resistance below 5
:
?
Go to Step 7.
“BLK/YEL” wire is high
resistance circuit.
7
Ground circuit check
1) Connect connectors to ECM.
2) Measure resistance between “ORN” wire terminal of
MAF and IAT sensor connector and body ground with
ignition switch turned OFF.
Is resistance below 5
:
?
Go to Step 9.
Go to Step 8.
8
Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between “C37-55” terminal of ECM
connector and vehicle body ground.
Is resistance below 5
:
?
“ORN” wire is open
circuit or high resistance
circuit. Poor “C37-55”
connection.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
9
IAT sensor for performance check
1) Check IAT sensor according to “Mass Air Flow (MAF)
and Intake Air Temperature (IAT) Sensor Inspection: in
Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace MAF and IAT
sensor.
Step
Action
Yes
No
Содержание SWIFT RS415 2017
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Страница 1255: ...Prepared by 1st Ed Dec 2004...
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