holmenick
Active member
Hi guys I have a 98 Jetta TDI AHU I had a no start condiot a week ago I have been troubleshooting, I traced it to the fuel solenoid, jumpered it to the 12v positive side, it clicks and allows the car to start and drive in limp mode. I have continuity through the wiring harness to pin #53 and have disconnected the battery cables and ran a 12v jumper to pin #53( ECU disconnected of course) when I put the ring terminal for the fuel solenoid to the pump it arc'd indicating good circuit and had 12v, next I replaced the 109 relay no change. With the key on run I get .7v the ECU was from malone with their 3 bar map sensor and chip and ran fine for the last 90 days. I am stumped here thinking I have a bad ECU