Ford Corsar Repair Manual page 220

TROUBLE DIAGNOSES
DIAGNOSTIC P F
CODE 21
-
THROTTLE POSITIOI'
NOTE: CODE 21 IS SET IF:
No airflow meter faults exist (Codes 32 or 33).
AND
Load is less than 200mg of airlstroke.
AND
Rpm is less than 1600 RPM.
AND
TPS voltage is greater than 2.5 volts.
AND
All these conditions exist for 2 seconds.
Engine at normal operating temperature.
Diagnostic bridge removed.
Ignition "off".
Clear codes.
Start engine and idle for
1
minute, or until
ECM light comes on.
OCEDURE 14
-
SENSOR (TPS) (VOLTAGE HIGH).
3
2
28
ECM
A N 4 3
-
-
+
' A
AE 101 THROTTLE POSITION
I
SENSOR
AN 114
1
-
1
AN 115
1
I
DIAGNOSTICS INPUT
L
- 1
I
I
Light on
I I
I
lgnition "on". Engine stopped.
Bridge diagnostic terminal
and note codes.
Code
21
is intermittent.
Look for poor electrical connection
'
in TPS circuit.
Any other code. See applicable chart.
Diagnostic bridge removed.
Ignition "off".
Disconnect TPS sensor.
Start engine and idle for 2 minutes, or until ECM light comes on.
I
Clear codes.
I
Ignition "on': Engine stopped.
I
I
Bridge diagnostic terminal and note code.
I
I
Code
22
I
I
AN34 with test light to 12 volts.
I
Disconnect ECM.
I
l
.
1
Light
I
I
Probe TPS harness connector circuit
connector terminals. circuit AN34.
If ok, replace TPS.
See note below.
I
Ignition "off".
Note: The TPS is not adjustable.
The reading at idle is used as "0% throttle':
Ignition "on".
Probe harness connector circuit AN44
1
with a voltmeter to earth.
I
Less than
1
volt. Over 1 volt.
between circuits
AN43 and AN44.
If ok, replace ECM.
Clear codes, run engine for 2 minutes and re-check for codes.