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High Pressure Fuel Pump Fail Replaced
My 2007 A8 4.2FSI was running fine all along until this morning when I went out to start it. It was idling extremely rough, no response from accelerator and then stalled. Here are the codes I pulled: Any thoughts on where to start? Car is stuck now in driveway. It is definitely a fuel issue I just do not know where to begin. Thanks!
12 Faults Found: 000135 - Fuel Rail/System Pressure: Too Low P0087 - 008 - Implausible Signal Freeze Frame: Fault Status: 01101000 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.06.30 Time: 14:19:16 Freeze Frame: RPM: 2218 /min Load: 59.2 % Speed: 44.0 km/h Temperature: 94.0°C Temperature: 41.0°C Absolute Pres.: 980.0 mbar Voltage: 13.716 V 001112 - Evap System Purge Control Valve (N80): Short to Ground P0458 - 002 - Lower Limit Exceeded - MIL ON Freeze Frame: Fault Status: 11100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 10.160 V 005224 - EVAP Canister Solenoid Valve 2 (N115): Short to Ground P1468 - 002 - Lower Limit Exceeded - MIL ON Freeze Frame: Fault Status: 11100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 004199 - Intake Air Switch-Over Valve (N335): Short to Ground P1067 - 002 - Lower Limit Exceeded Freeze Frame: Fault Status: 01100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 005173 - Secondary Air Pump Relay (J299): Short to Ground P1435 - 002 - Lower Limit Exceeded - MIL ON Freeze Frame: Fault Status: 11100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 005494 - Right Engine Mount Solenoid Valve (N145): Short to Ground P1576 - 002 - Lower Limit Exceeded Freeze Frame: Fault Status: 01100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 005490 - Left Engine Mount Solenoid Valve (N144): Short to Ground P1572 - 002 - Lower Limit Exceeded Freeze Frame: Fault Status: 01100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:29 Freeze Frame: RPM: 734 /min Load: 92.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 31.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 000258 - Mass Air Flow Sensor (G70): Signal too Low P0102 - 002 - Lower Limit Exceeded - MIL ON Freeze Frame: Fault Status: 11100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:30 Freeze Frame: RPM: 445 /min Load: 54.1 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 30.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 005715 - Please check DTC Memory of ABS Controller P1653 - 008 - Implausible Signal Freeze Frame: Fault Status: 01101000 Fault Priority: 0 Fault Frequency: 3 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:30 Freeze Frame: RPM: 440 /min Load: 45.5 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 30.0°C Absolute Pres.: 970.0 mbar Voltage: 12.065 V 008852 - Fuel Pressure Regulator Valve (N276): Open Circuit P2294 - 004 - No Signal/Communication - Intermittent - MIL ON Freeze Frame: Fault Status: 10100100 Fault Priority: 0 Fault Frequency: 2 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:30 Freeze Frame: RPM: 399 /min Load: 45.9 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 30.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 004763 - Fuel Pressure Regulator Valve; Bank 2 (N276): Open Circuit P129B - 004 - No Signal/Communication - Intermittent - MIL ON Freeze Frame: Fault Status: 10100100 Fault Priority: 0 Fault Frequency: 2 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:54:30 Freeze Frame: RPM: 399 /min Load: 45.9 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 30.0°C Absolute Pres.: 970.0 mbar Voltage: 11.811 V 009217 - EVAP Leak Detection Pump Control Circuit: Short to GND P2401 - 002 - Lower Limit Exceeded Freeze Frame: Fault Status: 01100010 Fault Priority: 0 Fault Frequency: 1 Mileage: 201130 km Time Indication: 0 Date: 2018.07.01 Time: 10:55:05 Freeze Frame: RPM: 306 /min Load: 66.2 % Speed: 0.0 km/h Temperature: 30.0°C Temperature: 30.0°C Absolute Pres.: 980.0 mbar Voltage: 13.208 V |
If all signals shorted to ground, check some fuses. Something loose or open. I wouldn't assume something drastic. Open the hood and start checking all wirings and hoses. MAF would do that to you, check and clean.
Cheers and good luck, Louis |
Would a dirty or faulty MAF cause all these other codes? I will try taking it off and give it a cleaning. But yesterday when I drove it, it was fine, no hesitation what so ever now it won't even run. Ugh!! |
Lots of shorts to ground there. Worth checking all the fuses as mentioned, but I would also look at wiring, could have been a rodent chewing away at something, that happens on occasion.
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Yes, it jus happened whenever. This is how I documented my MAF failures on 4.2 D2
http://www.dognmonkey.com/audi/98-a8...-problems.html Just check wiring under the hood, most of the time, when the electrical is bad, all components should show up, I wouldn't trust the VCDS religiously. Clear the failures, charge the battery fully and try again. Something must popped out of place. Cheers, Louis |
Originally Posted by Mike141
(Post 25173897)
Would a dirty or faulty MAF cause all these other codes? I will try taking it off and give it a cleaning. But yesterday when I drove it, it was fine, no hesitation what so ever now it won't even run. Ugh!! Just unplug the MAF to test. Then it runs open loop/a.k.a. a default program. IIRC MAF can only adjust fuel up or down 25% so it is really a system that corrects mixture more precisely relative to baseline set up. Baseline should be 14:1 mixture. FWIW, my own initial guesses variously are some fuse issue, a failing fuel pump, or...a bad battery. Remember that D3's get very temperamental electrically right as battery is on verge of collapse. Look at the scan you posted. Virtually every voltage reading shown is sub par, with the exception of the very last one. Sub 12V to me says failing or discharged battery. Not definitive, but decent pointer. |
Where exactly are the fuses for the fuel pumps? I think it is a fuel pump issue, the car will start and sputter like it's not getting fuel until it eventually stalls. I don't even hear the pump engaging when I open the driver's door like it should. I took apart MAF and cleaned it, no difference. |
Located a blown 15A fuse for engine management. I assume this is an issue; will replace tomorrow but I'm afraid the new fuse will just pop again. |
Pictures of the fuse and location?
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https://cimg3.ibsrv.net/gimg/www.aud...0a57f8f3c.jpeg Passenger (US) side fuse panel. I will replace later on today to see if it fixes the issue. |
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