ROCKNRAM

The truck runs ok, then it will start skipping or just shut off. I put idicator lights and something is shutting off the fuel system relay.
I have the following codes. 215,230,341,1388,1492,1689,1690,1693.

dahla

do u have a fuel pressure gauge? if so what kind of pressure has it been running?

ROCKNRAM

truck has 16psi until fuel relay is shut off

dahla

lift pump go out recently?

ROCKNRAM

I have replaced the lift pump with a fass, vp44

GUMP

Is it grounded good? Clear codes and try it again.

dahla

im hoping someone else can chime in and help i just know these trucks have lift pump problems which cause the vp44 to go out but from what ive heard the vp44 usually goes into like a limp mode, in which it runs but at very low rpms... don't know if thats what its doing or not im still on my original vp44.. kind of sounds like it but not sure sorry i can't be more help

BigIron70

Inspect the wiring and connectors at the ECM and fuel lift pump. Check terminals on fuel lift pump connections for corrosion. Moisture and dirt can cause excessive resistance in connections due to corrosion. Load test the fuel lift pump power and ground at the fuel lift pump connector using a head light as a load. If code P1689 is setting, load test the injection pump power and ground at the injection pump connector using a head light as a load. Before replacing any parts check battery connections, body and ECM grounds. Check the Gray connector near the passenger side battery.

ROCKNRAM

Thank all. I checked the cleaned all the grounds around the battery. I have not checked under load. I was not sure what the check on the ecm and the pumps. Thanks for the info BigIron. I will check these this afternoon.

ROCKNRAM

Cant find anything in the wiring. It appears to be the ecm. Where is a good place to get one. What symtoms have you seen with a bad one. Thanks

SIXSLUG

When my ECM went out it lit up the dash and then quit. After about 2 hours it would start but had no power and ran pretty rough. 2 hours later it wouldn't even start.
After the ECM was replaced I drove about 1000 miles and lost the lift pump.
I thought I wrote all the codes down somewhere but can't seem to find them.

johnh

p1689 indicates a bad vp44....no communication between the ECM and injection pump module..........when i had that code, i replaced the vp44 and it cured the no start problem...but i had a p1688 also

ROCKNRAM

Wish it would have fixed mine.

ROCKNRAM

Installed new ECM, and dealer flashed it . Truck is back. So, It threw the same codes as a bad pump. Monitoring the fuel relay it would cut off. At the end the wait to start light would not come on. Hope this helps someone keep from buying vp44 early. Thanks for all the help.