Questions tagged [pcm]

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06 dodge dakota melted a ignition coil now getting pcm codes an truck wont start but sounds like it wants to [closed]

I melted a ignition coil now I'm getting pcm codes truck wont start but tries it's best
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1answer
70 views

How are new cars (with HO2Ss) affected by cold starts?

New cars have H2OSs to warm the O2Ss. Is this, and any other new tech in new cars, enough to remove all the negative effects of a cold start? How does a cold engine behave differently now (2019) ...
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0answers
10 views

05 Buick Rainier clicking sound from pcm [duplicate]

Pcm has a fast clicking upon turning of the key before it will let you crank it up. What could fix this or do I need a replacement pcm? Sounds like a quite machine gun and last for about 30 seconds
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0answers
24 views

05 Buick Rainier engine reduction how to fix?

I'm having a problem getting the engine power reduction to go away. Usually I just have to turn off the vehicle and crank it back up and it's fine. Not this time. We have tried a number of things, ...
2
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3answers
40 views

Is Jeep and Dodge's, both 6.1l SRT8, PCMs interchangeable

One of the motors is having misfires in two cylinders, afaik compression, spark plugs and injectors were checked, and they were fine. PCM is suspected to have gone bad. Codes thrown: p0301, p0304. We ...
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0answers
38 views

Which wires provide keep alive power to the PCM in 2012 Ford Escape?

I have code P1633 - as far as I've check all the fuses in the power distribution (engine fuse) box have continuity - I don't know how to test relays? Next up I want to check where the harness plugs ...
1
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1answer
2k views

After odometer/mileage correction, which module data gets changed - engine or instrument cluster?

I read that the PCM tracks mileage for it's own purpose and BCM tracks and stores it for instrument cluster module to display it. So, when someone does an odometer/mileage correction, does it change ...
3
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0answers
43 views

when I plugged in my OBD scanner, I got not connected to the vehicle and the dashboard going crazy

when I plugged in my OBD scanner, I got not connected to the vehicle and the dashboard going crazy, and when I unplug the ODB scanner everything going back to normal... the vehicle I am talking about ...
5
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1answer
3k views

Why do modern PCMs prefer MAP over MAF

Why do modern PCMs prefer to use pressure sensors to estimate the air charge going into an engine instead of air flow meters. Eg they typically use a MAP sensor and complex software to estimate air ...
1
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2answers
222 views

2003 Chevy Cavalier: Why does acceleration sometimes stop working properly?

Sometimes when I'm driving, when i press gently on the gas pedal [like you should be doing] the acceleration doesn't work at all, and when i press down on it harder it works and revs violently, and ...
5
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1answer
333 views

Backtracing: P0606 (PCM fault) to P0716 (Input Speed Sensor) to Faulty Gearbox

I have a question about a problem encountered on my car (Audi A3 2004, 2.0TDI automatic sportback). I noticed my GSG-DSG 0623 gearbox behaving very oddly, like it does not know when to change gears, ...
1
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0answers
133 views

Faulty EVAP engine code

I had the following engine codes P1133 - HO2S Insufficient Switching Bank 1 Sensor 1 P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1 P0130 - O2 Sensor Circuit Bank 1 Sensor 1 The mechanics ...
6
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2answers
1k views

Replace or Repair Mazda MPV 2000 faulty ECU?

I asked a question about troubleshooting ECU related short circuits. No more short circuits in the wiring harness, the only short left appears to be inside the ECU. This leaves me with a faulty ECU. ...
5
votes
2answers
6k views

Vehicle does not start after installing new ECM

My vehicle did not start after I installed a used ECM I bought on Ebay. The vehicle starts fine with my old ECM. Should I have the used ECM flashed at the dealership or is the used ECM malfunctional? ...
4
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1answer
3k views

2006 Mazda 5 2.3L cranks but no start

I have a vexing problem and so far two mechanics and the dealer haven't been able to solve it. The car will crank and crank and crank but will not start. On the initial crank the fuel pump will come ...
4
votes
1answer
3k views

PCM Bench Testing

1997 Ford F350, 7.3, 2 wheel drive. PCM part number F6TF-12A650-AYG. OK the question is how to diagnose the PCM without codes due to the battery being dead? I have it out of the truck and was hoping ...
3
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1answer
578 views

How is Dodge Spark Advance Controlled by the PCM if there is a Distributor?

The Chilton manual for the late 90s and early 2000s Durango and RAM says that PCM controls ignition timing and spark advance. I don't understand this, because these motors are equipped with a ...
3
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3answers
8k views

Live scan tool for OBD 1.5 GM transitional?

1995 S-10 Blazer 4.3L Vortec V6 (vin W) with Powertrain Control Module (PCM) 1995 was the OBD transitional year for GM. The PCM itself is OBDI, but the interface connector has the 16-pin D-style ...
2
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1answer
713 views

Programming error Buick Enclave 2008

I just installed a brand new PCM on my Buick enclave 2008 gives me the P0602 code, the vehicle does not work, and some tell me it takes flasher PCM? I would like to know how flacher PCM (the stage) ...
6
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1answer
477 views

ODIS 5.0.6 diagnostic tool : how can I remove an option from a transformed vehicle?

We have a transformed car, a Bentley, which no longer has a motorized sunroof. The blind has also gone. However the car diagnostics exhibits a fault on the related, non-present devices and motors. We ...
1
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1answer
2k views

MAF sensor output signal vs. RPM?

I read that the MAF sensor output voltage increases as RPM increases. The ECU uses this voltage to determine other things, like idle RPM, ignition timing, fuel injectors, etc. Where can I find the ...
1
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2answers
305 views

1999 Grand Prix Issues

I bought this car used 3 yrs ago. Previous owners spun bearings in motor and replaced with 03. I had numerous issues with the cooling system and overheating since I purchased. I replaced water pump, ...