autostaretx
Erratic Member
Leaks in the tubing can also lightly spray oil in the area ... look for baked-on "old oil" as a way of tracing the source.
--dick
--dick
I also tested the system by buying an 1 1/2 plug for home depot and pulled the hose off the back side of the air cleaner and plugged the hose there. pulled the hose off the front of the intake manifold and put a plug in that will try to get what I used and threaded an air inlet onto it and put it to a compressor that had pressure control found a little hole in the hose from the air box to the turbo but that would not cause limp mode the creation cost about 5 bucks form home depot as a pressure testing toolLeaks in the tubing can also lightly spray oil in the area ... look for baked-on "old oil" as a way of tracing the source.
--dick
Thanks for sharing! I’m showing p1470-04 +short to gr What your process for interrogating The wiring harness? Do they make an adapter to stick in obd2 port or ecm/pcm to more easily test each component? I use the paper clip and gay wires going to test lead on the multi meter and wonder how much that throws the resistance offHere is a wiring schematic I was sent for the vac valve on my UK spec OM611, it should match your USA spec OM612, but do check carefully.
View attachment 125111
Keith.
PS Note that the solenoid is component 'Y87' and that the Brown wire (Br) is a 12 volt live and is NOT a ground as per usual MB wiring. The White (Ws or Wt) wire is then a control signal which is grounded inside the ECM to modulate the opening of the valve.
Also see wiring diagram on page 8W-30-6 of the 2003 Service Manual in DIY Sprinter (link below).
From my notes P1470 - 4 means 'Charge pressure control valve - Cable has Short circuit to Positive' and is usually a sign that the vacuum control solenoid has failed electrically with too low a resistance and hence too high a current.Thanks for sharing! I’m showing p1470-04 +short to gr What your process for interrogating The wiring harness? Do they make an adapter to stick in obd2 port or ecm/pcm to more easily test each component? I use the paper clip and gay wires going to test lead on the multi meter and wonder how much that throws the resistance off
That’s what i have as well, I’m not getting a ohm reading on the solenoid which may be due to the ohm (short) out to ground on the brown wire that i found which likely burnt my solenoid up. But now i need to find that wire and trace it to the shortFrom my notes P1470 - 4 means 'Charge pressure control valve - Cable has Short circuit to Positive' and is usually a sign that the vacuum control solenoid has failed electrically with too low a resistance and hence too high a current.
More info here... https://sprinter-source.com/forums/index.php?threads/67865/
Keith.
You are aware that the BROWN wire is actually a 12 volt POSITIVE feed from the ECM, yes?That’s what i have as well, I’m not getting a ohm reading on the solenoid which may be due to the ohm (short) out to ground on the brown wire that i found which likely burnt my solenoid up. But now i need to find that wire and trace it to the short
yes code has been cleared and comes back immediately. After tracing these two wires the the ecm i have found no break via resistance.You are aware that the BROWN wire is actually a 12 volt POSITIVE feed from the ECM, yes?
At first I thought Brown was always chassis or 12 volt Negative but in this particular instance it is not!
Keith.
PS Have you tried unplugging the valve, clearing the code then re-scanning for new codes? Try it and report back please.
You rock your posts are super helpful and I am grateful for all of the information you provide to people who are in need of help THANK YOU AGAIN you make the world a better place!From my notes P1470 - 4 means 'Charge pressure control valve - Cable has Short circuit to Positive' and is usually a sign that the vacuum control solenoid has failed electrically with too low a resistance and hence too high a current.
More info here... https://sprinter-source.com/forums/index.php?threads/67865/
Keith.
Do you have the schematic for connection 1 on the ECM? I believe my problem with the boost solenoid circuit lies thereThe ECU connection 3 number 6 17 22 35 48 I had to check I did not believe that a break in the wire was the issue but it was right under the radiator ran new wires an wala fixed my original solenoid was still good replaced it 2 time
s. Part of the issue was it could kind of giggle and re connect every time i would replace the part .
1 18BR/DG INTAKE AIR TEMPERATURE SENSOR GROUND
5 18BL/RD ACCEL PEDAL POSITION SENSOR 5 VOLT SUPPLY
6 18WT/DG BOOST PRESSURE SENSOR SIGNAL
7 20BR/YL MASS AIR FLOW SENSOR GROUND
8 18BR/GY ACCEL PEDAL POSITION SENSOR GROUND NO. 2
9 18GY/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 2
10 18BL/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 1
12 18DG/WT INTAKE AIR TEMPERATURE SENSOR SIGNAL
17 18WT/RD BOOST PRESSURE SENSOR 5 VOLT SUPPLY
18 20YL/DG MASS AIR FLOW SENSOR SIGNAL
19 20BR/BK MASS AIR FLOW SENSOR 5 VOLT SUPPLY
20 18VT IGNITION SWITCH OUTPUT (START)
22 18BR/WT BOOST PRESSURE SENSOR GROUND
23 18BR/BL ACCEL PEDAL POSITION SENSOR GROUND NO. 1
25 18BK/RD GLOW PLUG MODULE CONTROL
28 20BL/YL K-ECM
30 18RD/BL STARTER MOTOR RELAY 12 VOLT SUPPLY
33 20YL/RD MASS AIR FLOW SENSOR 12 VOLT SUPPLY
35 20BR BOOST PRESSURE SOLENOID 12 VOLT SUPPLY
40 20DG/YL ENGINE RPM
43 18VT/DG STARTER MOTOR RELAY CONTROL
46 18YL/BL ENGINE CONTROL RELAY SIGNAL
48 20WT BOOST PRESSURE SOLENOID CONTROL
BOOST PRESSURE SOLENOID - BLACK connector
CAV CIRCUIT FUNCTION
1 20WT BOOST PRESSURE SOLENOID CONTROL
2 20BR BOOST PRESSURE SOLENOID 12 VOLT SUPPLY
My suspicion as well. Thanks for the insight! And infoWiring diagrams for a 2003 Sprinter are on 'DIY Sprinter' under '2003SprinterManuals.zip' here...
T1N 901 903 Sprinter reference material
diysprinter.co.uk
The wiring for the Boost pressure Solenoid is on page 8W-30-6.
I suspect the 12 volt feed from the ECM also supplies several other components and one of those has the short to ground but the ECM is reporting this as the BPS as this is the first it checks on start up.
Keith.
What are all the other codes? These may give a clue as to what is happening.This van has 109k on it and throwing many codes
Okay, after doing some reading I have noted that c3 on the ecm contains the BPS pin 35 & 48 in which the brown wire (+) has a short to ground(my main issue). While testing there is no short when c1 on the ecm is unplugged. C1 only contains supply (+) and grounds to the other circuits in ecm. So c3 get its power and ground from c1 pin 5&7
so to me this means there is an internal short in ecm between c1 and c3? Do you think the issue could be anything else other than ecm being faulty?
This van has 109k on it and throwing many codes