hey all, been a while since i posted but im back.

Weell, the adventure with my felicia continues, as some of you may remember i have had all sorts of problem with the throttle body in the past( now sorted). Well, now something else has broken!

I took it in to local dealer for a basic settings job, but they could not clear one error in particular:

"Intake manifold pressure sender - G71"

"Open circuit/short circuit to Ground (GND)"

They thought MAP sensor was broken so tried a new one, and got the same error code. They then traced the wiring and found no shorts or breaks along the connections right into the ECU block.

After much discussion the technician and i aggreed that something must be faulty within the ECU as many of the sensor feeds are grounded internally within it, and this must be the source of my problem.

Evidently, as they suggested, a New ECU is in order. they are willing to do me a deal on a brand new one thay have had getting dusty for years - ECU, fitting and configuration for £140.

I will probably go for this as it seems a staeal compared to the retail price of a new unit (525!!!), unless anyone has any suggestions for other causes for this particular error code.

thanks in advance!!!!!!!

if the sensor is open circuit, the first thing i would try is taking the engine loom earth lead off the chassis (which is secured by a nut to the suspension turret near the ecu) and give the area round it a clean with some emery cloth. also check the condition of the terminals(there's 2 wire each with there own terminal iirc) on these wires and make sure they are nice and clean....

the sensors aren't grounded internally inside the ecu, they are grounded on the loom itself.

earth lead checked out OK. tested with continuity tester and all cables seem OK and correctly reouted to the ECU as per haynes wiring diagram.

Weird thing is, problem must be within ECU as when i test for contuinity between the 4 wires to the sensorand the negative pole mof the battery i get a closed circuit on each wire ONLY WHEN THE CONNECTOR BLOCK IS PLUGGED INTO THE ECU????

when connector not on ecu, only the first lead is grounded (as haynes dictates)

earth lead checked out OK. tested with continuity tester and all cables seem OK and correctly reouted to the ECU as per haynes wiring diagram.

Weird thing is' date=' problem must be within ECU as when i test for contuinity between the 4 wires to the sensorand the negative pole mof the battery i get a closed circuit on each wire ONLY WHEN THE CONNECTOR BLOCK IS PLUGGED INTO THE ECU????

when connector not on ecu, only the first lead is grounded (as haynes dictates)[/quote']

have you got any way of measrung the resistance off of each wire when it's plugged into the ecu??

not unless i drill tiny holes directly through the connector block on the uce to attach wires while its plugged in, and i dont really want to do that.

when not plugged the wiring resistance is virtually 0 as i would expect, as it is only about 1.5 metres from point to point, and as they use copper core cable this is about right.

They are going to check out a new ecu on it tomorrow anyway, if it makes no diference there wont be any charge.

what a bizzare situation. im gonna keep the old ecu and rip it apart to have a poke about inside if the new one resolves my problem!

if they are going to test it out without charge then go for it, you've got nothing to loose really!

exactly my thoughts. hope it solves my problem. will let you know