Question about 1999 Volkswagen Jetta
Working on a 99 jetta with a 2.0L. It has a new rebuilt throttle body and also a second hand ecm. I can;t set throttle adaption under 98 of basic settings. I'am using Ross-Tech scanner. I've already ripped apart harness and all wiring looks OK. Under measuring block at closed throttle it says throttle is at 53.2% with the throttle closed. I beleave that is why I'am not able to perform adaptions. Already tried swapping throttle body and ecm. Any thouhts on what else I can check.Any help would be appreciated.Thanks
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Posted on Jan 02, 2017
SOURCE: 2008 jetta trailer wiring
The wiring is behind the carpeting. It is not standard wiring, as the system operates on voltage differental, not separate filaments. It only uses one filament. Find a dedicated adapter and install it. This may be a job for a pro.
Posted on Nov 20, 2008
If there is an aftermarket radio in the car, unplug it. Sometimes those radios will interrupt the CAN signal & prevent the ECM from being accessed.
Posted on Jul 20, 2009
Jettas were notorious for electrical issues. I fought with one for 2 years.
The starter relay is on top of the starter in the center rear of the engine compartment near the firewall. Its mounted at the top of the bell housing, underneath the intake and next to the exhaust manifold and hard to get at from both the top and bottom. Personally, I'd take it to a good respectable foreign mechanic. Not worth fighting with
Posted on Jul 25, 2009
Running rough?? If i took a guess I'd say there's a faulty injector. Does it smoke like hell ?? Does it also miss at idle?- If so get a line wrench and a rag handy. Start the car and while idling wrap the rag around the base of the fuel line connector on injector 1 and crack it just a bit until fuel comes out. It might spray, thus the rag. If the miss gets worse, that ain't the injector to blame. Continue with the other 3. If you crack a line and there is no or very little change in the miss then you found the guilty party.
On a long shot it could also be a stuck valve.
Did that get it?? It sounds like an issue other than MAF but.... get a multimeter and try probing the connecter to the MAF. When you find out what it is , please let me know. I'm curious
*The key must be on*
pin 1- ignore it
pin 2- gnd = 12-14v
pins 2- 3 = 12-14v
pin 4- gnd = 5v
pins 3- 4 = 5v
P0101 - Mass Air Flow Sensor (G70): Implausible Signal
Posted on Dec 14, 2009
Checking for spark is really simple while fuel delivery is more complicated because of the the way it is metered for delivery. On VW's a fuel pump relay is used and a jumper cable connected to relay box. This controls the fuel pump to deliver fuel manually. With a fuel pressure gauge connected to the line from the pump continued withing the system, you assess whether you have correct fuel pressure, maintain it within a specif duration. Electronic fuel injectors do stick or stay open causing very poor or no start condition. Make sure you have fuel delivery since you are positive that spark is present.
Posted on May 30, 2010
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Dec 09, 2014 | 1998 Volkswagen Jetta
The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.
Conditions for Running the Throttle Learn Procedure
• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.
• The engine speed is between 450-4,000 RPM.
• The manifold absolute pressure (MAP) is greater than 5 kPa.
• The mass air flow (MAF) is greater than 2 g/s.
• The ignition 1 voltage is greater than 10 volts.
Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code
(DTC) List - Vehicle.
1. Start and idle the engine in PARK for 3 minutes.
2. With a scan tool, monitor desired and actual RPM.
3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
4. Ignition OFF for 60 seconds.
5. Start and idle the engine in PARK for 3 minutes.
6. After the 3 minute run time the engine should be idling normal.
Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
* If the engine idle speed has not been learned the vehicle will need to be driven at
speeds above 70 km/h (44 mph) with several decelerations and extended idles.
7. After the drive cycle, the engine should be idling normally.
* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds
and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
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