3) Possibly clogged manifold pressure sensor (G31)
Captured in fault code freeze frameIn blockmap data
Should be close to ambient pressure - especially when engine off.
This sensor has been replaced with OE item.
Help please Flashing coil light and EML on. Multiple codes 31391 27202 8208 8216 8217 8338
- Thread starter Westcoast888
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In blockmap data
Should be close to ambient pressure - especially when engine off.
This sensor has been replaced with OE item.
Internet back in the garage! Will hopefully be able to get back at it over the next few days
Hi MMIBased on the blockmap data we actually might have more issues - interestingly not manifested themselves as fault codes - yet.
1) Wiring problem by barometric pressure sensor (G71)
because we get this
IDE07735 Air filter outlet: pressure sensor 1 bank 1: uncnd. voltage 4.999 V
Some related experiments and explanations here
Fault code P011100
Can anyone shed any light please on this error code P011100 Air intake temperature sensor1? (2017 2.0 CXGB) I have reset the management light and it stays off for 3-5 days then its back on again. When the eml is on it still drives absolutely fine with no noticeable difference at all. I have...www.t6forum.com
Then the next in the queue...
2) Wiring problem by Exhaust temperature sensor 1 - before turbo charger
View attachment 259425
Plain wrong - reads out at max negative which suggests open circuit
Interestingly this didn't manifest itself yet but will probably interfere/inhibit DPF regeneration - which has been already initiated.
View attachment 259426
3) Possibly clogged manifold pressure sensor (G31)
Captured in fault code freeze frame
View attachment 259421
In blockmap data
View attachment 259422
Should be close to ambient pressure - especially when engine off.
More details
Fault code 30251 & 27202 [Resolved]
Hi, I'm having an issue with my van, the EML is on and glow plug light is flashing and i have 2 faults. I removed the boost pressure sensor and it was clogged with soot, I cleaned it but that didn't have any effect so I have one coming on tuesday, but the 2nd fault with the "open circuit message...
I've started to wonder if the fault "Sensor reference voltage" is actually a consequence of the open circuits...
I’m currently sat in the workshop working my way through the points you have raised above. I’m looking at the wiring diagram and it seems that sensors G31 & G 235 are both connected to the earth points 486 & 487 which translates to earth point 4&5 in the engine pre wiring harness. I’m wondering exactly where I can find these.
I’ve done a continuity test from pin 1 on G71 plug to the battery and all is well.
I’m just about to check continuity between pins 3&4 on G71 back to the ECU
Ok so there is no continuity between pin 1 of G31 and the battery NEG terminal
Trying to trace wiring but it’s maybe looking like a radiator pack out job?
Gonna drop the under tray to see if I can spot anything from below
Trying to trace wiring but it’s maybe looking like a radiator pack out job?
Gonna drop the under tray to see if I can spot anything from below
There is however continuity through to pin 6 on connector 60 on the ECU which according to the wiring diagram is connected to earthing point 486. Should this also show connection to the bodywork/ battery neg?
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Continuity proved
Pin 3 G31 to pin 51 T60 ECU
Pin 4 G31 to pin 39 T60 ECU
Pin 3 G31 to pin 51 T60 ECU
Pin 4 G31 to pin 39 T60 ECU
So testing between pin 1 G31 and pin 1 G81 reveals continuity so it kinda proves earth point 486 & 487 are connected together somewhere..
My van is manual trans so * applies to the wiring diagram I think..
My van is manual trans so * applies to the wiring diagram I think..
For clarity when I state continuity I mean I’ve tested with a multi meter and the reading is very low ohm (approx 0 - 0.1 ohm) so basically I think a good electrical path.
Continuity proved
Pin 3 G71 to pin 37 T94 ECU
Pin 4 G71 to pin 17 T94 ECU
Pin 1 G71 to pin 15 T94 ECU
Also cross checked to pin 1 on the radiator temp sensor G83 to Pin 1 of G71 and continuity there too.
Pin 3 G71 to pin 37 T94 ECU
Pin 4 G71 to pin 17 T94 ECU
Pin 1 G71 to pin 15 T94 ECU
Also cross checked to pin 1 on the radiator temp sensor G83 to Pin 1 of G71 and continuity there too.
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Something else that might help…
When I start the van, it idles high. Approx 1200rpm. Guessing it’s related to the open circuit fault code but thought I’d mention it just in case
When I start the van, it idles high. Approx 1200rpm. Guessing it’s related to the open circuit fault code but thought I’d mention it just in case
Not good.
So it looks there is disconnect between 486 and bodywork earth?
486 and 487 are wired together:
Are you sure? Perhaps pin 2 of G83?
Interesting... good to know.
So I’ve checked more connections and continuity etc. cleared the faults and it seems I’ve just got the 27202 sensor A open circuit fault remaining. Time for lunch so I’m going to get right back on it after a sandwich.
Thanks for bearing with me.
IDE07712 = -50c
Looks a pig to get to! Looking at the wiring diagram G235 is connected to both 486 & 487 which could suggest this may well be the problem.
I’ve unplugged the sensor and obviously get the same value and the open circuit fault is still there. I’m guessing this means the sensor is probably ok
IDE07738 = 536mbar which is still lower than it should be right?
I plugged the old sensor in to see if it made any difference and it didn’t. So that means that sensor should be ok. It’s looking like it narrowing it down to the loom on the front of the engine
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It would have been fine if you were 5000 meters above sea level.
Yes, should be around 1000 mbar.
IDE07735 = 3.987v
Sorry to be a bit thick but what cable is sensor A? Is it D39 connected to pin 51 on the ECU? Looking at the wiring diagram that white and yellow cable supplies the following sensors
G31 charge pressure sensor
G40 Hall sender
G235 exhaust gas temp sender 1
G247 fuel pressure sender
G447 charge pressure sender 2
G505 pressure differential sender
G581 position sender for charge pressure positioner
GX5 exhaust gas recirc valve 1
GX3 throttle valve module
When I check with my voltmeter between battery neg and pin 51 (ignition on) I have less than 1volt (0.895v to be precise)
If I also check between pin 1 & 3 of the G31 plug I get the same voltage.
Also to note I have the easily accessible sensors G31 G447 G247 & G235 disconnected in case they are shorting out or faulty.
Disconnecting the other sensors involves removing the charge cooler and or other parts of the van
So I’m thinking that either
1. the ECU isn’t putting out the 5v it should
2. There is a short to ground in the loom that is pulling the 5v down
3. The sensors that are difficult to get at GX3, GX5, G581, G505 or G40 have a fault causing the low voltage.
4. I’m totally away with the fairies!
Thanks to mmi for the help so far
G31 charge pressure sensor
G40 Hall sender
G235 exhaust gas temp sender 1
G247 fuel pressure sender
G447 charge pressure sender 2
G505 pressure differential sender
G581 position sender for charge pressure positioner
GX5 exhaust gas recirc valve 1
GX3 throttle valve module
When I check with my voltmeter between battery neg and pin 51 (ignition on) I have less than 1volt (0.895v to be precise)
If I also check between pin 1 & 3 of the G31 plug I get the same voltage.
Also to note I have the easily accessible sensors G31 G447 G247 & G235 disconnected in case they are shorting out or faulty.
Disconnecting the other sensors involves removing the charge cooler and or other parts of the van
So I’m thinking that either
1. the ECU isn’t putting out the 5v it should
2. There is a short to ground in the loom that is pulling the 5v down
3. The sensors that are difficult to get at GX3, GX5, G581, G505 or G40 have a fault causing the low voltage.
4. I’m totally away with the fairies!
Thanks to mmi for the help so far
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Thinking next move is to get the charge cooler out of the way in the morning.
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That's what I believe - sensor reference voltage A = D39.
Anyways, it's 5.00 Volts between D39 and earth. Thus also the same 5.00 Volts for each of the sensors along the D39
Should be 5.00 Volts
Based on the compiled list of sensors along D39 it seems we missed quite a few misreadings in the blockmap data
G40 was not reporting RPM at all in the blockmap (post 10)
Interestingly G247 was reporting a plausible value, however the raw voltage is not correct - should have been around 1 Volt for 382 bar. The 382 bar could be just ECU providing an estimate based on engine RPM.
Should have been at about 1000 mbar, voltage about 1 Volt
Was reporting plain zero engine running.
