With VAG

CHECKING EGR VALVE AND EGR TEMPERATURE SENSOR

REQUIREMENTS
^ Check with VAG 1551 Scan Tool (ST) in "Read Measuring Value Block" function, testing Closed Throttle Position.
^ VAG 1551 Scan Tool connected with "Read Measuring Value Block" function selected (display group 02).

- Indicated on display

Read measuring value block 2
1 2 3 4

^ No leaks in vacuum lines and hose connections.
^ Vacuum lines not plugged or kinked.
^ Engine oil temperature min. 50°C (122°F).




PROCEDURE
- Disconnect EGR Vacuum Regulator Solenoid Valve (N18) -1-.
- Connect VAG 1390 vacuum pump to the disconnected hose.
- Operate vacuum pump.
- Performance at Closed Throttle Position must get noticeably worse.

- If idle does not get worse:

- Check lines and connections for obstructions and clean if necessary.
- If necessary, replace EGR Valve.

- If idle gets worse:

- Read EGR temperature in display field 4. Temperature must rise steadily without interruption.
- If display reads 127.4°C, or if the temperature drops, there is an interruption.
- As soon as the temperature value reaches 200°C, disconnect vacuum pump.
- Press --> button.
- Press buttons -0- and -6- for "End Output" function.
- Press -Q- button to confirm input.

- If temperature does not change:

- Perform electrical testing.

- If no fault is found:

- Replace EGR Temperature Sensor (G98).