MK4 GLS 2.0L

1999 Volkswagen Jetta



June, 4, 2011 AT 2:37 AM

This car cranks but will not start. Changed coil pack, spark plugs, wires. Fuel line and injectors are OK. Narrowed problem down to some kind of electrical problem. Something seems to be shorting the electrical system. Run diagnostics came up with:

1.16706 - Engine Speed Sensor (G28): No Signal
P0322 - 35-10 - - - Intermittent
2.00518 - Throttle Position Sensor (G69)
16-00 - Signal Outside Specifications
3.00529 - Engine Speed Signal Missing
35-00 - -
4.00545 - Engine-Transmission ElectricalConnection
31-00 - Open or Short to Ground
5.01314 - Engine Control Module
49-00 - No Communications
6.01312 - Powertrain Data Bus
49-00 - No Communications

Can someone help me diagnose this? How do I trace the shorting component? - I know there is a short because the stock radio promptly blows it's fuse whenever I replace it.

Thanks a lot


2 Answers



June, 4, 2011 AT 11:54 AM

The engine speed (RPM) sensor -G28- detects engine speed and reference marks. Without an engine speed signal, the engine will not start. If the engine speed signal fails while the engine is running, the engine will stop immediately.

Engine Speed (RPM) Sensor (2.0L) Located On left side of engine block, near transmission flange

Disconnect gray 3 -pin harness connector (arrow) to the engine speed (RPM) sensor.
Measure sensor resistance between terminals 2 + 3 at connector to sensor.
Vehicles with engine code AEG: Specified value: 480.1000?
Vehicles with engine code AVH, AZG: Specified value: 730.1000?

Check sensor for shorts between terminals 1 + 2 and 1 + 3.
Specified value: INFINITY?
If specified values are not obtained: Replace Engine Speed (RPM) Sensor -G28-:



June, 7, 2011 AT 2:18 AM

Thanks. Tested my Engine speed sensor (crankshaft position sensor) and found it bad. I am not get any reading from the pins. I have ordered a new one and will let you know how things go. I am also looking at some wiring issues, specifically relays. I have read a lot about relay 109 going bad on these vehicles. Does my model use this relay?

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