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Oxygen Sensing Adaptation, Lower Load Range, Bank 1 (FRAU1) - Above Limit

The document details the diagnostic conditions and possible fault causes for the P2177 error code related to oxygen sensing adaptation in vehicles with DME 7.1.1. It outlines specific engine parameters and troubleshooting steps, including checking mass air flow sensors and the exhaust system for leaks. Additionally, it provides instructions for addressing faults and ensuring proper fuel pressure and injector functionality.

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49 views2 pages

Oxygen Sensing Adaptation, Lower Load Range, Bank 1 (FRAU1) - Above Limit

The document details the diagnostic conditions and possible fault causes for the P2177 error code related to oxygen sensing adaptation in vehicles with DME 7.1.1. It outlines specific engine parameters and troubleshooting steps, including checking mass air flow sensors and the exhaust system for leaks. Additionally, it provides instructions for addressing faults and ensuring proper fuel pressure and injector functionality.

Uploaded by

serviceboat.ru
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Cayenne DME 7.1.

1 OBD (II) 0
P2177
0-P2177

Oxygen Sensing Adaptation, Lower Load Range, Bank


1 (FRAU1) – Above Limit

Diagnosis conditions – V8
• Battery positive voltage between 10 V and 16 V
• Oxygen sensing system active
• Engine temperature > 60 °C
• Time elapsed after engine start-up between 250 and 350 sec-
onds (USA)
• Time elapsed after engine start-up between 302 and 402 sec-
onds (RoW)
• Engine load between 18 % and 70 %
• Mass air flow between 50 kg/h and 320 kg/h
• Engine speed - naturally aspirated between 800 1/min and 3520
1/
min

• Engine speed - turbo between 920 1/min and 3520 1/min

Diagnosis conditions – V6
• Battery positive voltage between 10 V and 16 V
• Oxygen sensing system active
• Engine temperature > 60 °C
• Engine load between 16 % and 50 %
• Mass air flow between 40 kg/h and 240 kg/h
• Engine speed between 1200 1/min and 4200 1/min

Possible fault cause


♦ Intake air system leaking

♦ Leaking exhaust system (draws fresh air)

♦ Incorrect main charge signal from MAF sensor

♦ Fuel pressure too low

♦ Fuel injector(s) mechanically faulty (sticks)

♦ Volume supply of fuel pump too low

2445 P2177
0-P2177 page 1
Printed in Germany – 7, 2003 P2177DME711
0 OBD (II) Cayenne DME 7.1.1

Affected pins
DME control module connector A, pin 29 and mass air flow sensor
1, pin 5

Not V6 - DME control module connector B, pin 109 and mass air
flow sensor 2, pin 5

Diagnosis/troubleshooting

Note!
♦ The diagnosis should display a positive oxygen sensing adapta-
tion deviation (enrichment) of more than 30% in the lower load
range (FRAU > 1.3).
♦ Only V8 - If this fault is set, both mass air flow sensors must
essentially be checked since the main charge signal is calcu-
lated from both signals.

Work instruction Display OK If not OK


1 Read out the fault ♦ Check whether addi- Only fault P2177 was In addition, at least one of
memory tional faults have recorded the following faults has been
been recorded Þ Step 2 recorded: P2191 (FRAO),
P0300 - P030x (misfire)
Þ First work through these
faults in accordance with the
instruction
2 Check mass air ♦ Connect the Voltage between 0.9 V and Replace faulty mass air flow
flow sensors 1 and 173 universal test 1.1 V sensor
2 box, 105-pole and Þ Step 3 → End
the 173-1 adapter
cable, DME 7.1.1
♦ Switch on the ignition

Measure signal voltage


between DME control
module connector:

♦ A, pin 29 and ground


♦ B, pin 109 and
ground
3 Check exhaust system (before catalytic con- Leakproof Correct fault, eliminate
verters) for leaks Þ Step 4 cause of damage if neces-
sary
→ End
4 Check fuel pressure, volume supply of fuel Continue troubleshooting in Engine Manual (Group 1) and
pump and injection valve (mechanically) Fuel Exhaust Engine Electrics Manual (Group 2)
→ End

0-P2177 page 2 2445 P2177


P2177DME711 Printed in Germany – 7, 2003

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