Waging war on the CEL
 

I'm sick of my CEL and its time to put and end to it without taking the bulb out preferably. I have codes P0451 - Fuel Tank Pressure Sensor Signal Error, P1178 - Max Positive AMFR correction, P1193 - O2 sensor heater circuit open downstream, and P1147 - Evap System Purge Valve Open or Short Circuit.
I have check for visable vacuum leaks and replaced vacuum line. Tapped on the purge valve, checked the gas cap, and checked the ring on the fuel tank. If anyone has any info pertaining to P0451, P1178, and P1447 I would appreciate any input. There is a D1 at a local pick and pull so any parts I may need to replace hopefully can come from a donor vehicle. Thanks

Oh yeah, those parts should be in excellent shape don't you think........:eek:

well i hoping for a good purge valve, all parts have a 30 day warranty so if they don't work (sensor wise) im not out any money

Just saying that they are of an old scrapped Disco, it all depends on the type of part, but would you expect it to be better than the one(part) you got?

one can hope...lol

CUpgt:
P0451 - Fuel Tank Pressure Sensor Signal Error,
P1178 - Max Positive AMFR correction,
P1193 - O2 sensor heater circuit open downstream, and
P1147 - Evap System Purge Valve Open or Short Circuit.

Looks like you have a bad ground. Can you read schematics? Spend some cozy time with the RAVE then follow the ground wires for the sensors and you'll find a common point.
If you just go at the grounds, get a supply of electrical anti-vibration washers and dielectric grease and renew the connections.
A quick check is to power up the circuits (run the car) and measure for any voltage drops near the ground points
When you see voltage, you've found where to begin the repair.
Don't assume that there is only one bad connection.

I'd rather fix electricals than mechanicals

SD

Interesting. I never thought about a ground problem. I am now 70+ miles after clearing the codes with no CEL and the truck is running great.:confused:
UPDATE: I contacted the previous owner who is a friend and the upstream O2s have been replaced in the last 20k miles so they should be fine. I pulled up the carpet and checked the ring on the gas tank and I was able to tighten it slightly. I also found some loose hoses on the evap charcoal canister and remedied that. I used the carb cleaner method to detect any vacuum leaks and came up with nothing. I'm going to try to find a purge valve at a pick and pull this weekend. I guess now I just play the waiting game and see what happens. Its kinda strange now having the orange glow of the CEL on the dash.