A6 Sedan V6-2.8L (ATQ) (2000)
Test Requirements:
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A/C system OK
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No DTCs in DTC memory of Engine Control Module (ECM).
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Vehicle at room temperature (warmer than +15 °C).
Test Sequence
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Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word". Refer to "Scan Tool
Testing/Scan Tool Connecting And Initial Checks", See: Computers and Control Systems/Testing and Inspection
Engine must run at idle for this.
When indicated on display:
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.
When indicated on display:
Read Measuring Value Block
Q
Input display group number XXX
-
Press buttons -0-, -5- and -0- to select "display group number 050" and press -Q- button to confirm input.
Indicated on display: (1 thru 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) and then release it (brief acceleration).
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Specified value in display field 4: Indication jumps for a few seconds from "Compr.ON" to "Compr.OFF" (compressor is switched off when
vehicle accelerates).
If indications do not resemble description:
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM . Refer to "Scan Tool Testing/Wire And Component Test Using
VAG1598/31 Test Box", See: Computers and Control Systems/Testing and Inspection
-
Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
Test box VAG1598/31 Socket
A/C control head -E87- Terminal
41
-
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.