Golf L4-1896cc 1.9L DSL Turbo (1Z) (1997)
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Throttle Position Sensor: Testing and Inspection
The Throttle Position sensor G79 is located on the accelerator pedal and transfers Throttle Position information to the Engine Control Module.
Special Tools, Testers And Auxiliary Items:
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VAG 1551/1552 Scan Tool with VAG 1551/3 adaptor cable
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VAG 1598/22 Test Box
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VW 1594 adaptor kit
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VAG 1527B LED tester
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Wiring diagram
Test Sequence:
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Connect VAG 1551/1552 Scan Tool
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Switch ON ignition
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Press 0 and 1 buttons to select address word 01 "engine electronics"
Display will appear as shown:
Rapid data transfer HELP
Select function XX
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Press 0 and 8 buttons to select Function 08 "Read measuring value block"
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Press Q button to enter input
Display will appear as shown:
Read measuring value block HELP
input display group number XX
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Press 0 and 2 buttons to select "display group 2"
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Press Q button to enter input
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Observe value in display field 2 (accelerator pedal position)
Display will appear as shown:
Read measuring value block 2 ->
rpm 0.0% 0 1 0 18.4°C
Specification: 0.0 % (accelerator pedal not operated)
-
Observe value in display field 3
Display will appear as shown:
Read measuring value block 2 ->
rpm 0.0% 0 1 0 18.4°C
Specification:
0 1 0 (accelerator pedal not operated)
0 0 0 (accelerator pedal operated)
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Press accelerator pedal down slowly, display field 2 must increase steadily to 100 % (accelerator pedal fully depressed)
Display will appear as shown:
Read measuring value block 2 ->
rpm 100.0% 0 1 0 18.4°C
NOTE for vehicles with automatic transmission ONLY: The kickdown switch pressure point must be distinctly felt BEFORE the Wide Open
Throttle stop position is reached.
If specified end value not reached:
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Adjust Throttle Position sensor
If display value does not change or is irregular:
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Check Throttle Position sensor G79 as follows:
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Switch OFF ignition
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Disconnect Throttle Position sensor harness connector
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Switch Fluke 83 multimeter to resistance range
