407 2.7 Hdi ECU wiring diagram re OBD codes

[407]

Ive had a few ODB codes randomly come up, trigger the MIL light and suspect there is a common loom plug / connector that is loose or needs a clean (eg the poor contact below gives it away)

Codes are

P0180 Diesel fuel temperature signal fault : Coherence
P0181 Diesel fuel temperature signal fault : Poor contact
P0183 Diesel fuel temperature signal fault : Short circuit to positive
P1164 Defective fuel pressure signal : Coherence of the pressure
P0096 Inlet air temperature signal fault (inlet air distributor) : Poor contact
P0098 Inlet air temperature sensor : Short circuit to positive or open circuit : Temperature too low

Is there a ECU wiring diagram that might show where the common connectors for these wires are ?

Otherwise car seems to run okay.

regards
Mark

[GiveMeABreak]

Here you go.

Diagram Info here

viewtopic.php?t=80489

[407]

Thanks as usual Marc

Looking at the schematic, a few components are not in the components listing (eg numbers do not appear)

eg 1341, 1346, 1347, 1363, 1364, 1367, 1369, 1375, 1377, 1378, 1379, 1385

is there a special diesel engine component list ?

I'm guessing 1378 and 1377 might be EGR units ?

I assume 1221 Diesel thermistor is the one giving the P0180, P0181 P0183 codes (diesel temp signal) - tracing the 2 wires it seems one goes to the left hand 48Y MR and the other to the right hand 48YGR - any loom diagrams to show any mid connectors?

cheers

[GiveMeABreak]

I'll try and update the list where I have time, I've added these now, thanks.

1341 : particle filter differential pressure sensor /
1346 : air flow sensor A
1347 : air flow sensor B
1363 : electric control turbo and local check B
1364 : cat. conv. upstream exhaust gas high temperature sensor B
1367 : electric control turbo and local check A
1369 : diesel fuel volumetric regulator
1375 : vertical rod electrovalve 1
1377 : electric EGR electrovalve A
1378 : electric EGR electrovalve B
1379 : vertical rod electrovalve 2
1385 : catalytic converter / exhaust gas high temperature sensor upstream of the pre-catalyst /

There are no indications of an inter-connection and the 1221 connections would seem to go via Harness 20 MOT from the fuel thermal sensor 1221 directly to the engine ECU on Pin C3 (48V MR) for wire 4030 and Pin B2 (48VGR) for wire 1385.

[407]

To help close this off, disconnected battery, pulled all the ECU connectors, sprayed them with contact cleaner, refitted and faults seem to have gone away.

Now waiting for the next gremlin when the Hdi chucks a wobbly.

I do have the fog lamp faulty warning gremlin back (was silent for many months) but the lights work and I've cleaned all connectors so I now just ignore it

[407]

Just on the foglight warning, seems that turning the fog lights on (front and rear) kicks the ECU and it is then happy, at least in my case.

Had not had the foglight warning come up for the last few weeks.