ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting Topic is solved

Post by **abscate** » 17 Apr 2019, 18:38

ME7 has both a intake air temp and intake pressure valve , problem with either one will limit boost

Post by **bmdubya1198** » 17 Apr 2019, 21:32

Sommerfeldt wrote: 17 Apr 2019, 17:28 Just a random thought, but I know ME7 references the IAT quite a bit even for boost requests - is yours up to par? Might be BS but anything is worth investigating, I suppose.

- S

I'm going to take a look at the IAT tomorrow to make sure I'm getting a proper reading in VIDA. That IAT and boost pressure sensors are very important for the ECU to monitor boost, and I know ME7 will cut boost if one of these sensors has failed.

I actually made an interesting discovery today... when I look at the upstream O2 sensor reading in Torque, I get nothing. I get a reading from the downstream, but not the upstream. I have a feeling that may be my problem.
However what I find interesting is that no codes are present aside from P1625.

I also checked the ECU A38 to the TCV, all good there. I also checked the resistance in the signal wires to the cluster (B41 and B46) and they are both good too (under 1 ohm). I'm really confused as to why these codes are here. Like I said, I'm going to see if I already mentioned these codes to Hilton, and if not I'll be sure to send him an email.

Post by **abscate** » 18 Apr 2019, 02:54

What is VIDA telling you about the front OXS?

I’ll also bet that without closed loop operation boost is inhibited.

Post by **abscate** » 18 Apr 2019, 03:01

B-dub...

Sometimes Abscate does His best thinking in the morning...

Let’s try clearing codes , disconnecting the turbo valve solenoid completely, starting up , and seeing what codes come up,

Post by **bmdubya1198** » 18 Apr 2019, 08:09

abscate wrote: 18 Apr 2019, 02:54 What is VIDA telling you about the front OXS?

I’ll also bet that without closed loop operation boost is inhibited.

It is, and I noticed some things showing "open loop" in VIDA. Can't remember exactly what, but I noticed that. I'm going to check the front OXS signal in VIDA in a little bit.

abscate wrote: 18 Apr 2019, 03:01 B-dub...

Sometimes Abscate does His best thinking in the morning...

Let’s try clearing codes , disconnecting the turbo valve solenoid completely, starting up , and seeing what codes come up,

Lol
That's a good idea, I'll try that after checking the the OXS.

Post by **bmdubya1198** » 18 Apr 2019, 09:15

Checked the O2 sensor signals. These look right for a cold start? I'm seeing votlage from both sensors on VIDA, so that's already a plus, but they aren't fluctuating much.

Post by **abscate** » 18 Apr 2019, 09:28

Sensor 1 should be fluctuating at about 1 Hz over the 0.5V value to go closed loop - looks dead to me.

Sensor 2 should be a constant 0.5V roughly. Looks ok.

Post by **bmdubya1198** » 18 Apr 2019, 09:55

That’s what I thought. I might need an O2 sensor.

I also tried unplugging the TCV... the car died immediately after starting and wouldn’t start back up. ECM threw a P0243 code. Cleared it off and plugged it back in and it started right back up. P1625 is still there and comes back every time I run the car after clearing codes.

Post by **abscate** » 18 Apr 2019, 10:11

Well, P0243 is right for a disconnected TCV.

P1625 maps to your ECM-6B00, so it looks like something is up with the MIL light circuit.

I think your Open Loop front OXS is probably causing your low boost - Im guessing ME7 inhibits boost in this condition.

Post by **bmdubya1198** » 18 Apr 2019, 10:40

abscate wrote: 18 Apr 2019, 10:11 Well, P0243 is right for a disconnected TCV.

P1625 maps to your ECM-6B00, so it looks like something is up with the MIL light circuit.

I think your Open Loop front OXS is probably causing your low boost - Im guessing ME7 inhibits boost in this condition.

From what I understand, that is correct. I'm banking on the front O2S being the issue.