S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
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Repeat test sequence.
^ LED tester must light up during burn-off.
If LED tester lights up:
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Replace MAF sensor.
If LED tester does NOT light up:
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Connect VAG 1598 test box with VAG 1598/5 adapter harness to engine wiring harness. Refer to VAG 1598 Pin Out Box Connecting. See:
Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan
Tool Connecting and Initial Checks/Connecting and Testing VAG 1598 Pin Out Box
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Connect LED tester to terminal 26 (GND) and terminal 25.
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Repeat test sequence and observe LED tester.
^ LED tester must light up during burn-off.
If LED tester does NOT light up:
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Replace ECM.
If LED tester lights up:
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Check for continuity (and also shorts to GND), between: terminal 4 of MAF sensor connector, and terminal 25 of test box.
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Resistance must be 0.5 ohm maximum.
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Locate and repair, as necessary, shorts/opens in circuit wiring between MAF sensor connector terminal 4, and ECM terminal 25.
