OK guys, I've got a conundrum.
DII, '03/'04, less than 100K on it.
Client tells me for a week or two, it would intermittently not start. OK, no doubt CkPS...
Famous last words, hook up the Vantage, has signal from CkPS.
Start poking around, find the control circuit to the fuel pump relay isn't doing its job pulling the ground side to ground.
Fire up the Rovacom, tell it to fire the fuel pump relay, no problem, ground side goes directly to ground (this circuit is controlled through the ECU).
Removed the engine compartment fusebox to take it apart to see if there was a problem there, nope, everything intact (probably didn't need to do that given the RCL's ability to draw it to ground).
Put it back together, it starts! Woo Hoo. Repeated it 18 more times. Fired it up one last time, moved it outside and prepared to call the client and tell him he owed me a case of good beer as I fixed it but didn't know why.
next morning, I go out to start it, no dice.
Grrreat! Figured that maybe like Dmac and Roverbyproxy's truck it might be a bad fuse box, I try a different passenger compartment fuse box (thanx Marty). No dice!
I've tried three different ECUs, two of each fuse boxes. I've ohmed out all fo the pins from the ECU that lead to ground, found one bad one, correcting it made no difference. I've worn out a high-lighter going over the circuit diagrams and am very nearly ready to throw in the towel and say that this is the third truck in ten years I just can't fix.
Anybody got any suggestions for me?
Doesn't happen often, but it happens-GRRR!
DII, '03/'04, less than 100K on it.
Client tells me for a week or two, it would intermittently not start. OK, no doubt CkPS...
Famous last words, hook up the Vantage, has signal from CkPS.
Start poking around, find the control circuit to the fuel pump relay isn't doing its job pulling the ground side to ground.
Fire up the Rovacom, tell it to fire the fuel pump relay, no problem, ground side goes directly to ground (this circuit is controlled through the ECU).
Removed the engine compartment fusebox to take it apart to see if there was a problem there, nope, everything intact (probably didn't need to do that given the RCL's ability to draw it to ground).
Put it back together, it starts! Woo Hoo. Repeated it 18 more times. Fired it up one last time, moved it outside and prepared to call the client and tell him he owed me a case of good beer as I fixed it but didn't know why.
next morning, I go out to start it, no dice.
Grrreat! Figured that maybe like Dmac and Roverbyproxy's truck it might be a bad fuse box, I try a different passenger compartment fuse box (thanx Marty). No dice!
I've tried three different ECUs, two of each fuse boxes. I've ohmed out all fo the pins from the ECU that lead to ground, found one bad one, correcting it made no difference. I've worn out a high-lighter going over the circuit diagrams and am very nearly ready to throw in the towel and say that this is the third truck in ten years I just can't fix.
Anybody got any suggestions for me?
Doesn't happen often, but it happens-GRRR!
