TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
Test sequence
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Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. See: Testing and
Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAS 5051/VAG1551 Scan
Tool
Engine must run at idle for this.
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.
Indicated on display:
Read Measuring Value Block
Q
Input display group number XXX
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Press buttons -0-, -5- and -0- to select "display group number 050" and press -Q- button to confirm input.
Indicated on display (1 to 4 = display fields)
Read Measuring Value Block 50
->
1
2
3
4
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Switch A/C system off.
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Specified value in display field 4: Compr. OFF
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Switch A/C system on using "Auto" button and adjust A/C system to maximum cooling or heating power. Compressor must run.
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Specified value in display field 4: Compr. ON
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Depress gas pedal completely (swiftly) in first gear during a road test and then release it (brief acceleration).
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Specified value in display field 4: Indication jumps for several seconds from "Compr. ON" to "Compr. OFF" (compressor shut-off for vehicle
acceleration)
If indications do not resemble description:
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See: Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31 Test Box
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
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Test box VAG1598/31 Socket - 41 (Instrument cluster)
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Repair open circuit or short circuit if necessary.
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If there are no malfunctions in the wiring, check function of A/C system.