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P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT
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mpvinnig
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PostPosted: Tue Sep 06, 2016 1:24 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

After going through three IMRCs, i am strongly of the opinion that my PCM is shot.

I will just seek a second opinion before I throw in the towel

http://www.mazdaforum.com/forum/mazda-mpv-17/2000-mpv-cel-p1518-p1520-21300/
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mpvinnig
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PostPosted: Tue Sep 06, 2016 2:10 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

mpvinnig wrote:
After going through three IMRCs, i am strongly of the opinion that my PCM is shot.

I will just seek a second opinion before I throw in the towel

http://www.mazdaforum.com/forum/mazda-mpv-17/2000-mpv-cel-p1518-p1520-21300/


Don't know if the below applies to MPV ...

Quote:
The Intake Manifold Runner Control (IMRC) Electric Actuated system (Figure 105) consists of a remote mounted motorized actuator with an attaching cable for each housing on each bank. Some applications will use one cable for both banks. The cable or linkage attaches to the housing butterfly plate levers. The 2.0L (2V) Focus/Escort IMRC uses a motorized actuator mounted directly to a single housing without the use of a cable. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the butterfly valve plates closed. The motorized actuator houses an internal switch or switches, depending on the application, to provide feedback to the Powertrain Control Module (PCM) indicating cable and butterfly valve plate position.

Below approximately 3000 rpm , the motorized actuator will not be energized. This will allow the cable to fully extend and the butterfly valve plates to remain closed. Above approximately 3000 rpm , the motorized actuator will be energized. The attaching cable will pull the butterfly valve plates into the open position. Some vehicles will activate the IMRC near 1500 rpm .

WARNING: SUBSTANTIAL OPENING AND CLOSING TORQUE IS APPLIED BY THIS SYSTEM. TO PREVENT INJURY, BE CAREFUL TO KEEP FINGERS AWAY FROM LEVER MECHANISMS WHEN ACTUATED.

1. The PCM uses the Throttle Position (TP) sensor and Crankshaft Position (CKP) signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in rpm to open the valve plates.
2. The PCM uses the information from the input signals to control the IMRC motorized actuator based upon rpm and changes in throttle position.
3. The PCM energizes the actuator to pull the butterfly plates open with the cable(s) or linkage.
4. The IMRC housing contain butterfly plates to allow increased air flow.


I had a failure awhile ago in which the CKP wiring got entangled in the serpentine belt and it had to be repaired, maybe the insulation is gone, or maybe the CKP is bad.

Will run diagnostics on that tomorrow so that can be ruled out. if the unit is faulty, then I will replace it and try again.

Will also run diagnostics and swap the TP sensor if necessary

Before seeking a second opinion
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mpvinnig
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PostPosted: Tue Sep 06, 2016 2:40 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

From the wiring diagram of the MPV 2.5L V6 engine wiring harness, the Throttle Position Sensor's Terminal 3 (Brown Wire) is connected to the IMRC Terminal 6 (Brown White) and this is also connected to the PCM ECT's Terminal 2 (Brown Green) which is also linked to the right front oxygen sensor.

Today I replaced the PCM ECT sensor.

The CKP is not directly connected to the IMRC wiring but then the PCM uses a variety of inputs which may or may not include the CKP so I will check that out -

This must be why projectSHO89 said at
http://contour.org/ceg-vb/forum/general/general-troubleshooting/7845-p1520-clarification:

Quote:
As for the P1520, the IMRC is the most likely problem. Changing the driver transistor inside the IMRC can not address this fault code. Additional possiblilites include the PCM and the interconnecting wires/connectors.,


Last edited by mpvinnig on Wed Sep 07, 2016 10:19 pm; edited 1 time in total
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mpvinnig
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PostPosted: Tue Sep 06, 2016 4:47 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

http://forum.mpvclub.com/viewtopic.php?t=15100&highlight=throttle+position+sensor

Interestingly relevant picture





TPS Cougar 632x543.jpg

TPS Cougar 632x543.jpg - File downloaded or viewed 94 time(s)

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mpvinnig
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PostPosted: Fri Sep 09, 2016 9:04 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

Diagnosis seems to give the TPS and ECT an all clear,

Problem circuit now appears to be IMRC Terminal 2 which is linked to the CKP sensor

When I ground IMRC Terminal 1 the box moves when the ignition is turned on and stays there - so the box is ok
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mpvinnig
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PostPosted: Mon Sep 12, 2016 8:08 am    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

IMRC Terminal 2 which is linked to the CKP sensor not at fault but a related wire is - read on to find out more.
I think that i finally fixed this.

Guess what has held me spellbound all these months - It was faulty oil pressure sender (oil pressure warning light) wiring, the insulation had worn off in at least three places and was making contact with the engine.

Once that was fixed, the IMRC still refused to work.

So I conducted a few more tests.

I then discovered that there was an open between IMRC Terminal 3 (IMRC Actuator Ground) and Chassis Ground, and so I ran new wire to Chassis Ground.

I have not attempted to rev the engine to 3,300 RPM to confirm or disprove that it all works.

But now all the tests recommended by Mazda to confirm that the IMRC is functional now pass in flying colours.

What I want to do next is to go on the road and see if there is a difference in response.



The by-product of this is that now, there is no electrical fault in an automobile (non-hybrid) that I cannot fix.

I have attended so many courses on auto electrical/electronic diagnosis and spent countless hours tearing apart and putting back.
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mpvinnig
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PostPosted: Wed Sep 14, 2016 2:24 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

By the second drive cycle, the check engine light would return!

P1520 first, and if I rev higher than 4,000 RPM then P1512 would follow.

So I decided to conduct voltage drop tests and here is what I found:

I think I got a bad PCM, am I right or wrong?

With the IMRC disconnected and engine running, the electrical system is outputting wrong voltages, that is not the fault of the box but the PCM

Voltage Drop Tests seem to indicate that my problem is with the IMRC Terminal 1 and IMRC Terminal 5 (could this be indicative of a bad PCM)?

According to Factory Electrical Standards

IMRC Terminal 1 voltage drop test conditions should be
B+ at Idle and Below 1.0v once the RPMs exceed 3,300
But at all times the voltage is 0.04v

IMRC Terminal 5 voltage drop test conditions should be
5v at Idle and Below 1.0v once the RPMs exceed 3,300
But at all times the voltage is 5v

All other IMRC Terminals 2,3 and 6 are within specifications.

Does that mean I got a bad PCM?

Since the rest of the PCM is good, can a piggyback circuit be made to fix this?

Will I have to repair the PCM or replace it?

For the IMRC to work, 2 grounds are connected and disconnected.

Or should I just start saving for a new PCM

Seems i got company

http://www.mazdaforum.com/forum/mazda-mpv-17/2000-mpv-cel-p1518-p1520-21300/

I still wonder how the computer ended up dead.

i feel though that if I could just repair the transistor at PCM Terminal 42 that drives IMRC Terminal 1, the computer would be OK again.

Has anyone used a PCM repair shop - can you recommend one?
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nls
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PostPosted: Wed Sep 14, 2016 4:18 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

http://www.bba-reman.com/us/index.aspx was the company I contacted at the time that I had the IMRC issues, and they had quoted $280 for the repair. That was more expensive than a replacement, but might save the hassle with compatibility, reprogramming, etc.
2000 MPV LX - 180,000 miles
1998 Accord EX - 145,000 miles
2011 Hyundai Sonata - 60,000 miles
1995 Saturn SW1 - Donated at 197,500 miles
2007 Hyundai Sonata - 110,000 miles
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mpvinnig
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PostPosted: Wed Sep 14, 2016 5:24 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

nls wrote:
http://www.bba-reman.com/us/index.aspx was the company I contacted at the time that I had the IMRC issues, and they had quoted $280 for the repair. That was more expensive than a replacement, but might save the hassle with compatibility, reprogramming, etc.


Thanks a million
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mpvinnig
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PostPosted: Thu Sep 15, 2016 12:47 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

Next Steps

https://www.youtube.com/watch?v=5zDVJCUPp2k

https://www.youtube.com/watch?v=mxoZsF6fXL4
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hildac07
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PostPosted: Wed Jan 17, 2018 8:07 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

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PostPosted: Tue Jan 30, 2018 1:36 pm    Post subject: Re: P1512 P1518 P1520 DTCs - RESOLUTION ATTEMPT Reply with quote

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