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Cabrio, Golf III & Jetta III 2.0L

  1. Connect Scan Tool (VAG 1551) to Data Link Connectors (DLC) located below A/C-heater control panel. With scan tool in READ MEASURING VALUE BLOCK function, select group "02".
  2. Ensure there are no leaks in vacuum hoses and connections. Ensure vacuum hoses are not plugged or kinked and engine oil temperature is at least 122°F (50°C). Start and allow engine to idle.
  3. Connect hand-held vacuum pump to EGR frequency solenoid, and apply vacuum. Idle quality should change noticeably. If idle quality does not change, check vacuum hoses for obstructions, and EGR valve and manifold for plugging.
  4. If idle quality changes, read EGR temperature in display field No. 4 of scan tool. Temperature must rise steadily without interruption. If display is 127.4°C or less, there is an open circuit.
  5. If temperature rises steadily, disconnect vacuum pump as soon as value reaches 200°C. Press right arrow button on scan tool. Press "0" and "6" buttons to select END DATA TRANSFER function. Press "Q" button to enter input.
  6. If temperature value does not change, check EGR temperature sensor wiring harness for open circuit. If wiring harness is okay, replace EGR temperature sensor.
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