Ford Corsar Repair Manual page 225

TROUBLE DIAGNOSES
DIAGNOSTIC PROCEDURE 19
-
CODE 33
-
AIR FLOW METER (VOLTAGE HIGH).
CODE 33 IS SET IF:
(1) Engine is running
AND
(2) Air flow meter voltage
>
4.4 volts.
AND
Both these conditions exist for 5 seconds.
Clear codes.
lgnition "off". Remove diagnostic bridge.
Start engine and idle for 1 minute or until
"ECM" lamp comes on.
Stop engine. Connect diagnostic plug.
lgnition "on". Note code.
I
Code 33
a
Clear codes.
lgnition "off". Remove diagnostic bridge.
Disconnect AFM sensor connector.
Start engine and idle for
1
minute or until
"ECM" lamp comes on.
Stop engine. Insert diagnostic bridge.
lgnition "on''. Note code.
Problem is intermittent.
Look for poor electrical
connection in AFM circuit.
I
If circuit AN16 is ok,
replace ECM.
Code 33
i I
1
If circuit AN15 is ok,
replace AFM.
Check for short to
voltage in circuit AN16.
AIR FLOW SENSOR
Check for open in
earth circuit AN15.
CENTRAL EARTHING POINT
1 ; ; l
AN114
r - 1
AN 115
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DIAGNOSTICS INPUT
- - _ I
I
I
Clear codes, run engine for 2 minutes and re-check for codes.
ES-61