S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
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Throttle Position Sensor: Testing and Inspection
Note: The Throttle Position (TP) sensor is located on the throttle body.
Requirement
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Accelerator pedal cable adjustment OK
Function Test with VAG 1551
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Connect VAG 1551 scan tool. Refer to Connecting and Operating VAG 1551 Scan Tool See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting and Operating VAG
1551 Scan Tool
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Switch ignition ON.
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Do not start engine.
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Select "Read measuring value block" function 08 using VAG 1551 Scan Tool.
Note: Do not allow engine to idle.
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Input display group number 03.
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Observe display values in channel 3, under the following conditions:
Closed Throttle Position (CTP): accelerator pedal not applied:
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Display value must be 5°-10°.
Wide Open Throttle (WOT): accelerator pedal pressed to floor:
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Display value must be 9°-102°.
Note:
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For values less than 5° there is a short circuit in the wiring connection to TP sensor.
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For values over 102° there is an open circuit in the wiring, or in the TP sensor.
If specified values are NOT obtained:
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Check TP sensor adjustment, and correct if necessary.
If adjustment is OK:
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Check voltage supply.
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Check wiring connection.
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Check TP sensor resistance.
Checking voltage supply
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Disconnect harness connector from TP sensor.
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Switch ignition ON.
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Connect Digital Volt Ohm Multimeter (DVOM) between terminals 1 and 2.
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Must be 4.5-5.5 volts.
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Connect Digital Volt Ohm Multimeter (DVOM) between terminals 2 and 3.
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Must be 4.5-5.5 volts.
If YES:
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Check resistance of TP sensor.
If NO (one or both specified values NOT obtained):
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Check ECM and ECM wiring.
Checking wiring and connections
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Switch ignition OFF.
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Connect VAG 1598 Test Box to Engine Control Module (ECM) wiring harness using VAG 1598/5 adapter cable.
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ECM remains disconnected.
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Using wiring diagram, check following circuits for continuity or shorts, by testing at terminals indicated:
Connector
VAG 1598
terminal
socket number
1
12
2
30
3
53
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Must be 1.0 ohm maximum.
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Repair open or short circuits as necessary, using wiring diagram.
