Jetta GLS L4-1.8L Turbo (AWD) (2001)
Catalytic Converter: Testing and Inspection
Three Way Catalytic Converter
Three way catalytic converter, checking
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1551 scan tool or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
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V.A.G 1788/10 Engine speed adjuster (only engine codes AWD, AWW)
Test sequence
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Connect VAG 1551 scan tool ((V.A.G 1552). Start engine and select engine control module with "Address word" 01. Connecting scan tool and
selecting engine control module.
Indicated on display:
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Press keys O and 4 for the function "Introduction of basic setting" and confirm entry with Q key.
Indicated on display:
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Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.
Indicated on display: (1 to 4 = Display zones)
Engine codes AWD, AWW
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Set engine speed to 1800 to 2200 RPM using speed regulator V.A.G 1788/10:
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Maintain the engine speed at 1800 to 2200 rpm until the display in display zone 4 jumps from "Test OFF" to "Test ON". The Three way catalytic
converter temperature in display zone 2 must be between 350 and 500°C.
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Continue to maintain the speed at 1800 to 2200 rpm until the specification "B1-S1 OK" appears in display zone 4.
Engine code AWP
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Depress brake pedal and hold.
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Press accelerator pedal to wide-open position.
The engine speed is increased by the control module to approx. 2300 RPM.
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Hold both brake pedal and accelerator pedal depressed until the display in display zone 4 jumps from "Test OFF" to "Test ON".
The three way catalytic converter temperature in display zone 2 must be between 350 to 500°C.
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Continue to hold both brake pedal and accelerator pedal depressed until the result of the function test is displayed in display zone 4
Specification:"B1-S1 OK"
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Release gas pedal and brake pedal
Continuation for all engine codes
If the display does not indicate as described: