2010 Porsche Cayenne S (9PA) V8-4.8L A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 67
P1093
Diagnosis information - DME V8 DFI
Mass air flow sensor - limit value exceeded / limit value not reached
Diagnostic conditions
- Vehicle voltage > 9 V
- Engine running
Possible fault causes
- Short circuit to B+/ground/between lines or open circuit in the lines
- Mass air flow sensor faulty
(setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V
- see Actual values, Filter [MAF], [Mass air flow 1 (sensor)] + [Mass air flow 2 (sensor)])
P1094
P1094
Diagnosis information - DME V8 DFI
Implausible mass air flow ahead of throttle valve
NOTE: For this fault code, the intake system between the hot-film mass air flow sensors (MAF 1 + 2) and the throttle is monitored.
NOTE:
- A mass air flow is calculated from the signals from the throttle potentiometer, engine speed sensor, intake air temperature sensor and ambient
pressure sensor as well as other engine operating values.
- The calculated mass air flow is compared with that measured by the MAF sensors.
- Any deviation may be due to both the calculated mass air flow and the measured mass air flow.
Diagnostic conditions
- Vehicle voltage > 9 V
- Engine running
- No electrical MAF sensor fault
- No throttle valve adjusting unit fault
- No ambient pressure sensor fault
- No intake air temperature sensor fault
- No speed sensor fault
- No valve lift fault
- No camshaft adjustment fault
- No intake manifold switch-over fault
Possible fault causes
- Hot-film mass air flow sensor soiled/faulty (displaced characteristic)
(setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V
- see Actual values, Filter [MAF], [Mass air flow 1 (sensor)] + [Mass air flow 2 (sensor)])
- Fault in the area of valve lift, camshaft adjustment, intake manifold, intake manifold switch-over, throttle valve, ambient pressure sensor,
intake air temperature sensor, speed sensor
- Changed air flow to hot-film mass air flow sensor due to:
- Foreign matter ahead of hot-film mass air flow sensor
- Hot-film mass air flow sensor twisted
- Leak just ahead of hot-film mass air flow sensor
- Clogged air cleaners
- Exhaust system faulty - flow severely restricted
- Leakage between MAF sensor and throttle valve adjusting unit
- Plug connection on the hot-film mass air flow sensor oxidized / faulty.
P1097
P1097
Diagnosis information - DME V8 DFI
Mass air flow ahead of throttle (MAF1) implausible
NOTE: For this fault code, the intake system between the hot-film mass air flow sensor and the throttle is monitored.
NOTE: A mass air flow is calculated from the signals from the throttle potentiometer, engine speed sensor, intake air temperature sensor and
ambient pressure sensor and compared with that measured via MAF1 sensor.