Porsche 996 1999

[knut grave]

Hey

fault code 99- tank pressure sensor.

unknown DTC 1673

fault code 96- shutoff valve activated.

the engine will not start, no fuel pressure. it starts when i put 12 volts directly on the fuel pump.

Knut

[Loren]

Hey

fault code 99- tank pressure sensor.

unknown DTC 1673

fault code 96- shutoff valve activated.

the engine will not start, no fuel pressure. it starts when i put 12 volts directly on the fuel pump.

Knut

:welcome:

(DTC 99)

P0450 Tank Pressure Sensor - Signal Implausible

P0452 Tank Pressure Sensor - Short to Ground

P0453 Tank Pressure Sensor - Short to B+

Possible causes:

- Pressure sensor faulty.

- Short circuit to ground.

- Short circuit to B+.

(DTC 96)

P0447 EVAP Canister Shutoff Valve (Output Stage) - Open Circuit

P0448 EVAP Canister Shutoff Valve (Output Stage) - Short to B+/Short to Ground

Possible causes:

- Wiring harness

- Shutoff valve

- DME control module

- Wiring harness

- DME control module

P1673 Fan Output Stage - Open Circuit

One of the radiator cooling fans is not operating.

Possible causes:

- Break in wiring.

- Relay faulty.

- DME control module faulty.

- Short circuit to ground.

- Short circuit to B+.

[knut grave]

Hey

fault code 99- tank pressure sensor.

unknown DTC 1673

fault code 96- shutoff valve activated.

the engine will not start, no fuel pressure. it starts when i put 12 volts directly on the fuel pump.

Knut

:welcome:

(DTC 99)

P0450 Tank Pressure Sensor - Signal Implausible

P0452 Tank Pressure Sensor - Short to Ground

P0453 Tank Pressure Sensor - Short to B+

Possible causes:

- Pressure sensor faulty.

- Short circuit to ground.

- Short circuit to B+.

(DTC 96)

P0447 EVAP Canister Shutoff Valve (Output Stage) - Open Circuit

P0448 EVAP Canister Shutoff Valve (Output Stage) - Short to B+/Short to Ground

Possible causes:

- Wiring harness

- Shutoff valve

- DME control module

- Wiring harness

- DME control module

P1673 Fan Output Stage - Open Circuit

One of the radiator cooling fans is not operating.

Possible causes:

- Break in wiring.

- Relay faulty.

- DME control module faulty.

- Short circuit to ground.

- Short circuit to B+.

[knut grave]

Thanks

is it possible that som of these foult codes cause the fuel pump not to start?

Knut

[Loren]

It appears you have a number of electrical problems - was the car in an accident? or had some other damage?

I would sort the problems with the fuel tank pressure sensor - it could be the root cause.

Also, the radiator cooling fans need to be checked to prevent overheating.

[knut grave]

Yes the car has had a small kolisjon inn the front..

where on the car can i find the fuel pressure sensor?

knut

[Loren]

Well - the charcoal canister, fuel filler, sensors etc. are in the front right fender. So perhaps the is where the collision was? If so, then that may be the damaged radiator fan too.

[fpb111]

Loren,

Does the 996 have a "shock" switch to shut off the fuel pump in event of crash?

[Loren]

Loren,

Does the 996 have a "shock" switch to shut off the fuel pump in event of crash?

From the 996 Carrera Introduction Service Book:

"Fuel & Ignition System - Fuel Pump - Safety Functions

When the engine has been started, the airbag control unit sends a signal to the DME control unit, the frequency and pulse duty factor of which is defined as "airbag not triggered". When the airbag is triggered, the pulse duty factor changes this signal. This change causes the DME control unit to switch off the fuel pump."

They also sold an Emergency Shut-off Switch for the GT3 RS (intended for racing) that compketly disconnects the battery with one flip of the switch. So this shuts everything down. It is required for most professional and amateur racing organizations.