Ford Corsar Repair Manual page 204

TROUBLE DIAGNOSES
DIAGNOSTIC PROCEDURE 3 (Cont'd)
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lgnition "on".'Engine stopped.
With fuel pump relay connected.
backprobe relay connector circuit AF64
with a test light to ground.
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Yes No
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Backprobe relay connector circuit
Repair open circuit AF64 to relay connector.
A105 with testlight to earth.
Testlight should light. Does it?
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Ignition "off" for 10 seconds.
Repair open in circuit A105.
Backprobe relay connector circuit
AF67 with testlight to earth.
observe testlight as ignition is
turned "on': It should light for 3
seconds. Then go out. Does it?
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Ignition "off" for 10 seconds.
Backprobe relay connector circuit
AF66 with testlight to earth.
Observe testlight as ignition is
turned "on''. It should light for 3
seconds. Then go out. Does it?
Ignition "off".
Disconnect fuel pump relay and ECM connectors.
Check ckt AF67 for being open -or- shorted to earth.
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Circuit AF67
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Yes No
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Check resistance acrossNay
Fuel pump relay
pins opposite connector
circuits AF67 and AF64 should
be more than 75 ohms. Is it?
Replace relay.
If open circuit.
-
repair wire and
continue back to
step on
previous page.
If circuit shorted
to earth.
-
Repair short to
earth and retest
at step
.
1
is operating
will engine start?
back to
correctly,
repair open in
circuit AF66.
Procedure 2.
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step on
previous
Page.
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Yes
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No
Yes
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Check for "Open" in circuit AF66 or A105.
If both circuits are ok.
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With engine running, disconnect fuel pump relay.
Engine should continue to run. Does it?
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1
No
Yes No
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Replace Replace relay
and retest
at step
.
Continue back
ECM
Continue
to Diagnostic