P0120,P0121, P0122, P0123
Symptom: The CHECK ENGINE lamp (MIL) is on. High idling speed. A/C compressor
does not work.
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P0120
,
P0121
,
P0122
,
P0123
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Throttle position sensor
Symptom of fault
The CHECK ENGINE lamp (MIL) is on. High idling speed. A/C compressor
does not work.
Conditions
P0120: All-embracing DTC
P0121 Engine running and throttle closed: >1 V or <0.24 V
P0122 Engine running: <0,2 for 5 seconds.
P0123 Engine running: >4,96 for 5 seconds.
Diagnostic help
The throttle position sensor reading can be obtained on an ISAT scan
tool.
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Turn the ignition switch to the ON
position and then back to the OFF position
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Connect an ISAT scan
tool.
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Select
"READ FUNCTIONS".
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Select
"THROTTLE POSITION".
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If the throttle position sensor is in perfect working order the ISAT scan tool
should show the current throttle position, 10-90%% (0,5 - 4,5 V) from fully up (not depressed) to
fully depressed accelerator.
Checking the wiring. Intermittent faults may occur as a result of occasional short circuits
and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in
different directions to reveal faults in the wiring harness. Observe the multimeter, ISAT scan
tool or test lamp while carrying out this check.
Diagnostic procedure
1. Check the throttle position sensor's ground connection and power
supply
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Turn the ignition switch to the ON
position and then back to the OFF position.
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Unplug the throttle position
sensor's 3-pin connector.
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Take voltage readings on the
connector.
• pin 1 to B-
__________ar;_______ about 5 V
• B+ to pin 2
__________ar;_______ about 12
V
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Are all voltage readings correct?
Continue with point 2.
Rectify the lead in question and proceed to point 3.
2. Check the control module's throttle
position input
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Turn the ignition switch to the ON
position and then back to the OFF position.
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Unplug the throttle position
sensor's 3-pin connector.
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Connect an ISAT scan
tool.
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Select
"READ FUNCTIONS".
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Select
"THROTTLE POSITION".
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The reading obtained on the ISAT scan tool should be about 99%%.
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Connect a jumper lead between
pins 2 and 3 of the throttle position sensor's connector.
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The reading obtained on the ISAT scan tool should be about
0%%.
Are all readings OK?
Change the throttle position sensor and continue with point 3.
Rectify the lead in question and proceed to point 3.
3. Final check
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Clear the diagnostic trouble
code.
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Implementation of driving cycle:
Drive the car at varying engine rpm and loads for 5 minutes.
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Evaluation of driving cycle: Check
whether the diagnostic trouble code has recurred.
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Has the diagnostic trouble code recurred?
Proceed to
.
The remedial measure taken was correct.
