Need help with fault codes on 04 CS

[isakpede]

Hi.

Can anyone help me with these fault codes the Durametric read out of my Cayenne today and what to do to resolve them.

907

Load management operat. on vehicle.

Could this have anything to do with the engine vibration/misfiring from 1200-1600rpm on high gear shifts?

1592

Air quality sensor

I changed both servomotors for the temperature mixing valves on left and right side today. My hands are sore and all scratched up, due to the narrow spaces in the dashboard. Hope I never, ever have to this job again..... :angry:

778

Steering-angle sensor

When reading of the fault codes in the PCM system with the Durametric, I got an PSM alarm on the dashboard when I reset the fault code. When I start up the car and drive, the warning disappears. Any ideas why? Something to worry about?

Thanks in advance

Isak

[Loren]

Fault code 0907

Load management operation on vehicle electrical system/DME control module

Possible causes of fault

- 'no display' Loads are/were switched off temporarily. The load management operation was enabled because of undervoltage.

Fault code 1592

Air Quality Sensor

Possible causes of fault

- Short circuit to ground

- Implausible signal

- Open circuit/short circuit to B+

- Air quality sensor faulty

- Front air-conditioning system regulator control module faulty

Fault code 0778

Steering-angle sensor

Possible causes of fault

- No message from steering-angle sensor (no signal/communication)

Battery problems???

[wvicary]

I agree with Loren about the battery but be sure to also test the rear battery if your vehicle has one. May I ask why you changed servo motors for a air sensor code??

[isakpede]

I agree with Loren about the battery but be sure to also test the rear battery if your vehicle has one. May I ask why you changed servo motors for a air sensor code??

Hi and thanks for answers.

I changed the servomotors due to fault codes on these. Had some problems with temperature regulation on left side, changed both to be sure. Opened the servomotor and it seems like the little plastic wheels and screws are just worn out. (bad Bosh quality, different manufacturer on the new ones)

Can anyone tell me where to find the air quality sensor?

I got under voltage during testing of the servomotors, and had to recharged the battery. But it seems like the Durametric is not able to delete and reset the fault code for the load management system. The indication shows ca 12 v after stopping the car. Should it be more? If I change the battery, is it advisable to use the charger to keep power on the car while i change it? This car has only one battery beneath the drivers seat. Do I have to dismantle the driver seat to perform this operation?

Any idea what battery suits this vehicle best?

Isak

[Loren]

Before I would change it any more parts I would have the battery tested.

If you need to replace the battery get a properly sized 95 - 110 AH battery. 110 AH if you have a lot of electrical options or tow.

I would also reset the codes and see of they come back.

[isakpede]

Can anyone tell me where to find the air quality sensor?

[Loren]

Can anyone tell me where to find the air quality sensor?

It is under the cowl cover (plastic guard under the wipers/windshield) on the left side.

Let me know if you need more detail.

[PTEC]

907 is a garbage fault. You'll find that in just about every Cayenne out there. Erase it and don't worry about it.

The air quality sensor is indeed where loren mentioned. If you take off the cover for the brake fluid resevoir you'll find it attached on the bottom of the cowl, toward the center of the vehicle. If it comes back after you erase, its common for this to get left unconnected if you've had a new windshield installed.

As far as the PSM light goes, its pefectly normal for that happen if the battery has been disconnected.

Edited April 8, 2009 by PTEC

[isakpede]

907 is a garbage fault. You'll find that in just about every Cayenne out there. Erase it and don't worry about it.

The air quality sensor is indeed where loren mentioned. If you take off the cover for the brake fluid resevoir you'll find it attached on the bottom of the cowl, toward the center of the vehicle. If it comes back after you erase, its common for this to get left unconnected if you've had a new windshield installed.

As far as the PSM light goes, its pefectly normal for that happen if the battery has been disconnected.

Hello again.

Think I found it. It was attached on the underside of the plastic cover. It has the part number 7L0907643. Can't erase the fault code, so I guess I have to buy a new.

By the way, what does this sensor do?

[Loren]

907 is a garbage fault. You'll find that in just about every Cayenne out there. Erase it and don't worry about it.

The air quality sensor is indeed where loren mentioned. If you take off the cover for the brake fluid resevoir you'll find it attached on the bottom of the cowl, toward the center of the vehicle. If it comes back after you erase, its common for this to get left unconnected if you've had a new windshield installed.

As far as the PSM light goes, its pefectly normal for that happen if the battery has been disconnected.

Hello again.

Think I found it. It was attached on the underside of the plastic cover. It has the part number 7L0907643. Can't erase the fault code, so I guess I have to buy a new.

By the way, what does this sensor do?

Don't buy a new one until you erase the fault - perhaps Durametric can not erase that fault.

Have someone with a PST2 or PIWIS try to erase the fault.