porsche cayenne S - error codes help

[mochoukri]

Dear all,

before i started this post i have searched through the topics but couldn't find any relevant info/solution for my problem.

Let's start from the beginning. A couple of weeks ago, i took my car to the car wash. The dude at the car wash used high pressurized water to clean the engine.

After the wash the psm failure signal came up and the car went into limp mode. I guess some water messed up the electronics of the car.

With durametric i made a diagnose and 3 errors showed up:

- P0481

Description: Fan 2 Control Circuit

- P0103

Description: Mass or Volume Air Flow Circuit

= P0571

Description: Brake Switch A Circuit

After resetting the errors, the rpm goes to zero after starting the engine, so engine goes dead. When i prevent the rpm going to zero by pushing the gas pedal, the psm failure shows up again and rpm doesn't drop to zero anymore.

So i am completely confused.

Is someone familiar with this problem?

Any tips are welcome.

Thanks in advance

the log sheet is as following:

USB Hardware Present

Device is present but not plugged into the car.

USB Hardware Present

All Porsche Models Selected

Device is plugged into car and ready

Cayenne Selected

Cayenne DME Selected

About to get fault codes

moduleType = CayMotronicDME71

dtcCount = 3

Fault Number: P0481

Description: Fan 2 Control Circuit

dtcCount = 3

Fault Number: P0103

Description: Mass or Volume Air Flow Circuit

dtcCount = 3

Fault Number: P0571

Description: Brake Switch A Circuit

Cayenne Tiptronic Selected

About to get fault codes

moduleType = CayTiptronic

dtcCount = 1

Fault Number: 1314

Description: DME control module

Cayenne Airbag Selected

About to get fault codes

moduleType = CayAirbag

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

Repair Infomation: Make sure the key is in the ON position. The vehicle may not have this option or there may be a wiring problem to the computer. This could also be a module that simply failed to respond.

Cayenne Kessy Selected

About to get fault codes

moduleType = CayKessy

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

Repair Infomation: Make sure the key is in the ON position. The vehicle may not have this option or there may be a wiring problem to the computer. This could also be a module that simply failed to respond.

Cayenne Air Condtioning Selected

About to get fault codes

moduleType = CayHeating

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

Repair Infomation: Make sure the key is in the ON position. The vehicle may not have this option or there may be a wiring problem to the computer. This could also be a module that simply failed to respond.

Cayenne Cluster Selected

About to get fault codes

moduleType = CayInstrumentCluster

Cayenne PCM2 Selected

About to get fault codes

moduleType = CayPCM2

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

Repair Infomation: Make sure the key is in the ON position. The vehicle may not have this option or there may be a wiring problem to the computer. This could also be a module that simply failed to respond.

Cayenne Steering Column Switch Selected

About to get fault codes

moduleType = CaySteeringColumnSwitch

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

Repair Infomation: Make sure the key is in the ON position. The vehicle may not have this option or there may be a wiring problem to the computer. This could also be a module that simply failed to respond.

Cayenne Wiper Selected

About to get fault codes

moduleType = CayWiper

dtcCount = 1

Fault Number: 0

Description: Module failed to initialize

[Loren]

:welcome:

It would be helpful if you would tell us the model year of the car.

P0103 Main Charge Signal (MAF) - Above Limit

Possible cause of fault:

- Short circuit to B+ in signal wire

- Short circuit to B+ in sensor voltage

- Mass air flow sensor faulty

- DME control module faulty

P0481 Fan control output stage 2 - open circuit/below limit value/above limit value

Possible cause of fault:

- Break in wiring in power supply to fan module 2 (small/to the left)

- Short circuit to ground in control line to fan module 2

- Short circuit to B+ in control line to fan module 2

- Fan module control module 2 faulty

- DME control module faulty

P0571 Brake Switch "A" Circuit

Possible fault causes for vehicles up to and including model year 2004:

- Open circuit in the power supply for the brake light switch

- Brake light switch faulty

- Short circuit to B+ in control line

- Short circuit to ground in control line

- Open circuit in control line

- DME control module faulty

Possible fault causes for vehicles as of model year 2005:

- Fault is set in PSM control module, refer to there

[mochoukri]

Dear loren,

Many thanks for your quick reply.

It is a porsche cayenne s - 2004- 4.5 v8.

You gave me some possible causes.is there a tutorial available on how to measure/check the causes?or can you explain to me?

Thanks a lot.

Regards,

Mo

[Loren]

I think step one would be to clear the codes and see what comes back. Water where it should not be can give false codes so dry it out clear the codes and check again a day or so later.

Nest I see how old your battery is. Cayenne's can do all kind of strange things with a weak battery. I suggest that if your battery is 4 years old or older - replace it. Then clear the codes and see if any come back.

[hahnmgh63]

When I picked up my '06 Turbo S on the East coast (Deleware) I immediately began a drive to the West Coast (Wash state). I had multiple faults, dipped beam, level control, AWD transfer system, etc.. throughout the drive. When I got the car home, did a good wash of course but I went through every connection underneath, in the engine compartment, in the wheel wells and disconnected then and sprayed contact cleaner enhancer ( http://store.caig.com/s.nl/sc.2/category.292/.f ) on every connection and then reconnected. After all of that the only one that ever came back was the dipped beam error and I replaced both HID bulbs and that one has never returned. These cars are definitely picky about their connections. It is a little bit time consuming but a good start before going more in depth. In my case I am lucky in that I have a lift in my shop but there is room under the Pig to do it on your back still.

[mochoukri]

Battery was replaced 10 months ago.

By now the connections shoumd be dry,but maybe corrossion ocurred.

I will check the connection plugs and try to reset the faults and see what happens.

The connection pkugs for the afm are easy to find.how about the other plugs?where are they located and hiw to access?

[wvicary]

I would disconnect the connections in question and dry them with low pressure compressed air. High pressure washers can force water past the weather pack seals and the seal will not allow it to dry out completely. Then clear all codes and retest systems.

If a battery is ten months old or ten minutes old, it's always a good idea to verify that is within spec.

[mochoukri]

Dear Loren, hahnmgh63 and wvicary,

it is easy to find the connections for the Mass Air Flow Meters.

But where are the connections situated for the Fans and the Brake Switch?

Can someone please explain me how to access.

Your input is highly appreciated.

thanks

Mo

[mochoukri]

Goodmorning Guys,

i have replaced the brake switch sensor and the brake switch error is gone now.

Still remaining are the MAF and fan 2.

Yesterday i have reached the fan connectors but what b***tches to unplug them. I didn't succeed in unplugging the connection.

Someone whone knows how exactly to unplug them??

Thanks

mo

[mochoukri]

ok guys,

i have unplugged the connections of both fans. Did a reset with durametric but the error codes of fan and MAF still show up.

I am desperate know.

Suggestions???

DME module maybe?? if yes, how to access/check??

[wvicary]

Have you tested all of the fuses?

[mochoukri]

@Wvicary

No i didn't. You mean the fuse box inside on the left hand side of the steering wheel, right?

[mochoukri]

Ok Wvicary,

i have checked the fuses one by one of both fuse boxes. They all seem ok...

[wvicary]

There is a fuse block located under a plastic cover near the brake master cylinder.

[mochoukri]

Fuse box near brake master cylinder checked. All ok...