Jetta Sedan L4-1.9L DSL Turbo (BEW) (2005)
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Check intake air temperature sensor -G72- plausibility. Ignition ON, engine OFF: MVB 7, channel 3.
Temperature should correspond approximately to ambient temperature with a cold engine. Repair if out of normal range.
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Compare Charge Air Pressure sensor -G31- and barometric pressure. Ignition ON, engine OFF.
MVB 10, channels 2 (barometric pressure) & 3 (charge air) should be similar as well as corresponded to actual altitude. Sea level = approx. 1000 mbar.
Tip:
If intake air reading in preceding step deviates from the true temperature, then the barometric reading will also be incorrect. Repair as needed.
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With the engine running, view MVB 3, channel 3 while gently wiggling MAF sensor -G70- connector.
If valve changes abruptly:
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Check and/or replace MAF sensor wiring terminals if necessary.
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Remove EGR valve and inspect if valve is stuck open.
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Check Camshaft/Crankshaft timing at idle using MVB 4, channel 4.
Correct range = approximately 0 - 2.
If out of range:
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Adjust using procedure in ElsaWeb.
If cause is still not found:
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Proceed to remaining items outlined in table of possible causes.
Quality Check
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Evaluate MVB 93 while performing deceleration phase as previously described.
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On Vehicle Diagnostic, testing and information system VAS 5051/5052, select "Guided Functions".
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Select "BEW engine".
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Select "Generate readiness code"
Warranty
*Code per warranty vendor code policy.
Required Parts and Tools
No Special Parts required.
No Special Tools required.
