2002 VW Jetta TDI

2002 VOLKSWAGEN JETTA
105,000 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
KSEVERANCE
  • MEMBER
  • 2 POSTS
Unable to start my VW 2002 Jetta TDI. Fault codes are PO725 Engine speed circuit malfunction; P1780 manufacture control transmission; and P1850 manufacture control transmission. I also noticed that the glow plug light will not come on when I try to start the cold engine. These codes were read from an Actron OBDII auto scanner. The starter turns engine over like normal, but it will not start. I did have the battery out to charge up and pulled fuses out to see if there was a draw on the battery with the key in the off position, but discovered there wasn't a draw on the battery. I checked the fuses for the glow plug and they are okay. The vehicle will not start now. What is the problem with the vehicle?

describe your problem...
Jan 6, 2011 at 1:23 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
FIXITMR
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 9,990 POSTS
did you find and check the 50amp glow plug fuse?
Jan 7, 2011 at 8:50 AM
Advertisement
Avatar
MHPAUTOS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 31,937 POSTS
If the 50Amp fuse is ok, check the glow relay also note that the relay feed power to the glow plugs in groups of 2, that is one power wire feeds 2 glow plugs and there are 2 feeds out of the relay.

mark (mhpautos)
Jan 7, 2011 at 10:34 PM