Ford Corsar Repair Manual page 231

TROUBLE DIAGNOSES
DIAGNOSTIC PROCEDURE
23
-
CODE 45
-
RICH EXHAUST INDICATION.
Code 45 is set if condit~ons exist as for code 13
but 0 2 sensor voltage remains high for more than 50 seconds.
I
Engine at normal operating temperature.
I
I
Connect diagnostic bridge.
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Run engine at approx 2000 rpm for 2
minutes and note ECM light.
Light staying "on" more than "off'',
or flashing "Open Loop''.
I
Flashing closed loop, with light
staying on and off approximately
the same amount of time.
/
Start engine, hold rpm at approx. 2000
and note ECM light.
Ignition "off".
Disconnect diagnostic bridge.
Disconnect oxygen sensor and ground
circuit AN18.
ECM light went off
1
for at least 30 seconds.
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Code is intermittent. If no additional
codes were stored, look for poor
electrical connection and see below.
/
Light staying '!on1' more than "off7',
or flashing "Open Loop".
I
A rich exhaust condition exists.
Check
for
the
following:
- High fuel pressure.
- Leaking injector.
-
Air flow meter.
-
Canister purge.
.
-
-
Coolant sensor circuit.
- TPS sensor operation.
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Ignition "off".
Disconnect ECM connectors.
Check 0 , earth circuit AE16 for aood continuitv
to engine earth. (Must have a clian flawless
.
connection to the engine rear head bolt).
Check for good continuity from engine earth
to battery minus terminal.
If either AE16 or engine to battery connections
are poor, repair circuit.
If both good, replace ECM.
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Clear ECM learned parameters.
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Repeat from step (1) above.
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1
ECM light "off" or mostly "off".
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Faulty oxygen sensor.
Flashing normal closed loop, light
flashing on and off approximately
the same amount of time.
(
Code intermittent.
*
Possibly past lean operation causing learned
compensation towards rich.
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-
Low fuel pressure.
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-
Contaminated fuel.
1
-
Vacuum leak on inlet.
I
-
Exhaust leak ahead of
0 ,
sensor.
I
-
Lean injectors.
I
-
Air flow meter.
Clear codes, run engine for 2 minutes and re-check for codes.
ES-67