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07 V70 rough/slow start ECM-5000

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Flyingfish
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07 V70 rough/slow start ECM-5000

Post by Flyingfish »

The car: 2007 V70 2.5T 139k miles

The codes CEM 9C03(resolved)
ECM 5000

The engine has cranked slow occasionally over the past couple of months. (1/10 times). Then last week (moderate temps 40-50 F) it becomes almost constantly hard to start (about 8 out of ten times). After replacing the three year old battery I finally scanned the codes. I had a 9C03 (this code had been there for over a year...the car worked and I was lazy so I didnt fix it until now) and ECM 5000 so I replaced the immobilizer antenna and the crank position sensor. The 9C03 code is gone but I still have rough starts.

Does anyone have any other suggestions? Ways to test the crank position sensor? I've heard a high draw on the starter can cause interference to the sensor...is it worth pulling the starter?
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RickHaleParker
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Re: 07 V70 rough/slow start ECM-5000

Post by RickHaleParker »

ECM-5000 Engine speed (RPM) sensor signal. Faulty signal

Condition
The engine control module (ECM) detects the flywheel position for TDC using the signal from the engine speed (RPM) sensor. The diagnostic trouble code (DTC) is stored if the position for TDC is missing sporadically. The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
  • The engine control module (ECM) uses the signal from the camshaft position (CMP) sensor if the camshaft position (CMP) sensor has been adapted
    Variable valve timing control is blocked.
Possible source
  • Signal interference
    Contact resistance and oxidation
    Intermittent fault causes in the engine speed (RPM) sensor wiring.

Fault symptoms
  • The engine is difficult to start
    Poor performance.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Flyingfish
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Re: 07 V70 rough/slow start ECM-5000

Post by Flyingfish »

Thanks for the reply...given there hasn't been anything else done that should be causing interference I plan to pull and have the starter tested.

If that all tests ok I'll consider separating out the crank position sensor wire from the rest of the harness and re route it.
Flyingfish
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Re: 07 V70 rough/slow start ECM-5000

Post by Flyingfish »

Update:
Three good starts in a row and no codes; the problem seems to be fixed. I pulled the starter and replaced it. I dont have a readily available method to test the amperage under load (the old starter passed fwiw at O'Reilly).

I did not feel like separating out the sensor wires out from the harness. I did however re-secure the harness with various zip ties to make sure it wasnt laying on the starter. The original plastic guide that the crank pos sensor and cam sensors, vacuum lines and coolant pipe are all clipped to had broken and was allowing the sensor wires to get closer to the body of the starter.

So thanks RickHaleParker for reiterating the interference aspect.
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RickHaleParker
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Re: 07 V70 rough/slow start ECM-5000

Post by RickHaleParker »

Flyingfish wrote: Sun Jan 19, 2020 5:53 pm (the old starter passed fwiw at O'Reilly).
Forgot Where I Was at O'Reilly :?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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abscate
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Re: 07 V70 rough/slow start ECM-5000

Post by abscate »

RickHaleParker wrote: Mon Jan 20, 2020 12:49 am
Flyingfish wrote: Sun Jan 19, 2020 5:53 pm (the old starter passed fwiw at O'Reilly).
Forgot Where I Was at O'Reilly :?
..or did the starter shuffle off it’s mortal coil at OReilly,s?
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Flyingfish
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Re: 07 V70 rough/slow start ECM-5000

Post by Flyingfish »

Lol yeah I know O'Reilly's. What can I say... they had the part and I need it now not in 2-7 days (or dealer prices).
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volvolugnut
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Re: 07 V70 rough/slow start ECM-5000

Post by volvolugnut »

Good practice is to examine and replace any crumbling wire loom under the hood. It really helps protect wires and looks good too. If you do this replacement, only use wire loom rated for 275 F or above and use good electrical tape like 3M Super 88. Easy project and rewarding in reduced electrical problems and better looks. Also gives you a chance to look for corrosion and chaffed wires.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.
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