Lambda control, before TWC right : Lambda control is at rich stop. (P0171)
Lambda control, before TWC right : Lambda control is at rich stop. (P0171)
Possible cause:
- Lambda control
Affected functions:
- Engine output
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Test 1: In connection with warranty and goodwill work, supplemental information on this symptom is available in TIPS.
Test 2: Check self-adaptation.
1. In connection with warranty and goodwill work, supplemental information on this symptom is available in TIPS.
1. No further information available.
2. Check self-adaptation.
Test 2.1: Check lambda control.
2.1. Check lambda control.
Test 2.1.1: Check component Y58/1 (Purge control valve).
Test 2.1.2: Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.
Test 2.1.3: Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.
Test 2.1.4: Inspect air cleaner housing.
Test 2.1.5: Check component G3/4 (Right O2 sensor, before TWC [KAT]).
Test 2.1.6: Check component Y62 (Fuel injectors).
Test 2.1.7: Check exhaust system for leaks.
2.1.1. Check component Y58/1 (Purge control valve).
Test 2.1.1.1: Actuate component Y58/1 (Purge control valve).
Test 2.1.1.2: Test current consumption of component Y58/1 (Purge control valve).
Test 2.1.1.3: Perform mechanical inspection of component Y58/1 (Purge control valve).
2.1.1.1. Actuate component Y58/1 (Purge control valve).
Test sequence
- Switch on ignition.
- Actuate component Y58/1 (Purge control valve).(Operate pushbutton F2.)
Warning!Communication with ECU required.
2.1.1.2. Test current consumption of component Y58/1 (Purge control valve).
Figure legend
- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2
Test prerequisite
- The actual values are not okay.
Test sequence
- Measure direct current with multimeter between socket [F.4] 100 of the 126-pole socket box tester and socket [F.45] 15 of the 35-pole socket box tester.
- Switch on ignition.
Specified value
- Amperage[0.4...0.9] A
Question
- Is the measurement value OK?
YES
The measurement value is OK.End of test
NO
The measurement value is not OK.Possible cause and remedy
- N10/1f57 (Fuse 57)
- N10/1kI (Circuit 87 relay, engine)
- Line from component N3/10 (ME-SFI [ME] control unit) to component Y58/1 (Purge control valve)
- Line from component N10/1 (Driver-side SAM control unit with fuse and relay module) to component Y58/1 (Purge control valve)
- Y58/1 (Purge control valve)
End of test
2.1.1.3. Perform mechanical inspection of component Y58/1 (Purge control valve).
Figure legend
- 019Vacuum tester
- Y58/1 (Purge control valve)
Test prerequisite
- Actuation is OK.
Test sequence
- Switch off ignition.
- Connect the vacuum tester to the input of component Y58/1 (Purge control valve) with the 3 x distributor.
- Operate engine at idling speed.
- Engine at operating temperature
- Actuate component Y58/1 (Purge control valve), then with key F2.
Warning!Communication with ECU required.
2.1.2. Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.
Test 2.1.2.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Test 2.1.2.2: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.
Test 2.1.2.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).
2.1.2.1. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Warning!Communication with ECU required.
2.1.2.2. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.
Warning!Communication with ECU required.
2.1.2.3. Check reference signal of component B2/5 (Hot film mass air flow sensor).
Test sequence
- Switch on ignition.
Status of relevant actual value:
- HFM-SFI ( Reference signal ):Warning! Communication with ECU required.
Specified value
- Reference signal[46...59] ms
Question
- Is the measurement value OK?
YES
The actual value is okay.End of test
NO
The actual value is not o.k.Possible cause and remedy
- Check lines from component N3/10 (ME-SFI [ME] control unit) to component B2/5 (Hot film mass air flow sensor).
- B2/5 (Hot film mass air flow sensor)
2.1.3. Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.
Possible cause and remedy
- Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.
Note
- Proper sealing between the air cleaner housing and the housing of the HFM mass air flow sensor must be assured.
End of test
2.1.4. Inspect air cleaner housing.
Possible cause and remedy
- Inspect air cleaner housing for correct installation.
Note
- Proper sealing between the air filter housing and the housing of the HFM mass air flow sensor must be guaranteed (the gasket surface must not be cracked).
End of test
2.1.5. Check component G3/4 (Right O2 sensor, before TWC [KAT]).
Warning!Communication with ECU required.
2.1.6. Check component Y62 (Fuel injectors).
Safety note
Warning!Risk of explosion, poisoning and injury!Fuels are highly inflammable and toxic if inhaled. Fuels may cause skin damage. fuel vapors are explosive, invisible and spread out at floor level, they are toxic if inhaled and produce giddiness and an anaesthetizing effect.Rules of conduct and protective measures
- Wear suitable protective clothing.
- Pay attention to national safety precautions and regulations.
- No fire, sparks, naked flames and smoking.
- Ensure the work place is adequately ventilated.
- Never drain or pour in fuels over assembly pits.
- Store drained fuel in a suitable and sealed vessel.
- Immediately eliminate any fuel which has flowed out.
First-aid measures
- Clean moistened skin with water and soap.
- Change moistened clothing as quickly as possible.
- If fuel gets into your eyes, rinse out your eyes immediately with water and contact a doctor if necessary.
Test 2.1.6.1: Inspect component Injectors for leaks.
Test 2.1.6.2: Inspect operation and spray pattern of component Injectors.
2.1.6.1. Inspect component Injectors for leaks.
Figure legend
- 055Measuring beakerY62 (Fuel injectors)
Test sequence
- Switch off ignition.
- Remove fuel rail together with component Y62 (Fuel injectors).
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Bridge between socket (F.4) 100 of the 35-pole socket box tester and socket (F.17) 113 of the 126-pole socket box tester.
- Switch on ignition.
Specified value
- Component Y62 (Fuel injectors) must not drip.
Question
- Was the test o.k.?
YES
The test was okay.Further possible causes of fault
- Inspect operation and spray pattern of component Y62 (Fuel injectors).
NO
The test was not okay.Possible cause and remedy
- Y62 (Fuel injectors)
2.1.6.2. Inspect operation and spray pattern of component Injectors.
Figure legend(Shop-made tool)
- 1xClutch 140 545 35 28
- 2xContact spring 004 545 56 26
- 1xRed banana connector
- 1xBlack banana connector
- 2,2 mRed cable with diameter 1,5 mm(Pin 1)
- 2,2 mBrown cable with diameter 1,5 mm(Pin 2)
- 2 mInsulation sheathing with diameter 6 mm
Test sequence
- Switch off ignition.
- Remove fuel rail together with component Y62 (Fuel injectors).
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Insert bridge.:
- Bridge between socket (F.2) 98 of the 35-pole socket box tester and socket (F.17) 113 of the 126-pole socket box tester.
- Switch on ignition.
- Component M3 (Fuel pump) runs.
- Hold component Y62 (Fuel injectors) in a vessel and briefly operate manually with shop-made test cable set at sockets 5 and 9 of the 35-pin socket box.
Specified value
- Fuel injectors should eject fuel uniformly.
Question
- Was the test o.k.?
YES
The test was okay.End of test
NO
The test was not okay.Possible cause and remedy
- Y62 (Fuel injectors)
End of test
2.1.7. Check exhaust system for leaks.
Possible cause of fault
- Leaks
Possible remedy
- Check entire exhaust system for leaks.