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TROUBLE DIAGNOSES
DIAGNOSTIC PROCEDURE 15
-
CODE 22
-
THROTTLE POSITION SENSOR (TPS) (VOLTAGE LOW).
NOTE: CODE 22
IS
SET IF:
No airflow meter faults exist (Codes 32 or 33)
AND
Engine is running.
AN D
TPS voltage is less than 0.1 volts.
AND
All these conditions exist for
2
seconds.
Diagnostic bridge removed.
lgnition "off". Clear codes.
Start engine and idle for
1
minute, or until
ECM light comes on.
I
2
28
- -
ECM
AE 101
THROTTLE POSITION
SENSOR
AN 115
,
DIAGNOSTICS INPUT
Light on
a
Light off
I
lgnition "on''. Engine stopped.
Bridge diagnostic terminal and note code.
I
Code
22
is intermittent.
Look for poor electrical connections
in TPS circuit.
I
Code 22
I
I
Diagnostic bridge removed.
lgnition "off". Clear codes.
I
Disconnect TPS, then
I
Start engine.
With engine running, jumper
AN43
and
AN44.
Together at TPS harness connector.
I
Ignition "on". Engine stopped.
I
Bridge diagnostic terminal and note codes.
I
I
Code
22
only
I
Remove jumper from
AN43
and
AN44.
1
Check voltage between harness connector
AN34
and
AN43
using digital voltmeter.
I
I
I
4-6
volts
Below
4
volts
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I
Ignition off.
Disconnect ECM.
Check
AN44
for open or short to earth.
Ignition "off':
Disconnect ECM.
Check
AN43
for open
I
or short to earth.
I
1
I
Circuit
AN44
ok.
Circuit
AN44
not ok.
I
i
Circuit
Circuit
AN43
not ok.
I
I
AN43
ok.
Check €CM connector
terminals.
If ok, replace ECM.
Repair
open or short in
circuit
AN44.
I
1
Check ECM connector
terminals.
If ok, replace ECM.
Repair
open or short
in
AN43.
Note: The TPS is not adjustable.
The reading at idle is used as "0% throttle".
Clear codes, run engine for 2 minutes and recheck for codes.
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