Tengo un problema con un Malibu 1998. Sigo recibiendo varios códigos, pero principalmente P0420. He reemplazado el convertidor catalítico dos veces. Ambos sensores de oxígeno han sido reemplazados. Revisé Mass Air Flow y EGR y ambos parecen estar funcionando correctamente. ¿Alguien puede dar ideas para resolver esto? A continuación se muestran los resultados de Carista y Torque.
Gracias
Carista :
OBD2 - confirmed:
P0102 - Mass or Volume Air Flow "A" Circuit Low
P0122 - Throttle/Pedal Position Sensor/Switch "A" Circuit Low
P0401 - Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0420 - Catalyst System Efficiency Below Threshold Bank 1
OBD2 - pending:
P0401 - Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0420 - Catalyst System Efficiency Below Threshold Bank 1
P1441
Esfuerzo de torsión:
Fault log report generated by Torque for Android
=================================================
Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: Not present
Current Fault Log
------------------
P0102: Mass or Volume Air Flow Circuit Low Input
P0122: Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P0401: Exhaust Gas Recirculation Flow Insufficient Detected
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
Pending Fault Log
------------------
P1441: [BMW] Leakage Diagnostic Pump Control Open Circuit
[Chrysler] Evaporative Emission (EVAP) System Flow During Non-Purge
[Nissan] Vacuum Cut Valve Bypass Valve
[Dodge] Evaporative Emission (EVAP) System Flow During Non-Purge
[Jeep] Evaporative Emission (EVAP) System Flow During Non-Purge
[Seat/Audi/Volkswagen] EGR Valve Circ Open/Short to Ground
Par :
Mode $06 report generated by Torque for Android
================================================
Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: Not present
Unit and scaling information are not supplied with the data from the ECU for this type
of vehicle. Consulting the manufacturers service book for this information is recommended.
Test report:
------------------
TID:$02 CID:$04
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$10
- Lean to Rich sensor threshold voltage(constant)
Min: 79
Test result value: 79
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Min: 250
Test result value: 171
FAIL
----
TID:$02 CID:$20
- Lean to Rich sensor threshold voltage(constant)
Max: 250
Test result value: 15
PASS
----
TID:$02 CID:$26
- Lean to Rich sensor threshold voltage(constant)
Max: 100
Test result value: 8
PASS
----
TID:$02 CID:$30
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$31
- Lean to Rich sensor threshold voltage(constant)
Max: 110
Test result value: 138
FAIL
----
TID:$02 CID:$40
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$46
- Lean to Rich sensor threshold voltage(constant)
Min: 65
Test result value: 65
PASS
----
TID:$06 CID:$35
- Lean to Rich sensor switch time(calculated)
Max: 111
Test result value: 47
PASS
----
TID:$06 CID:$41
- Lean to Rich sensor switch time(calculated)
Max: 342
Test result value: 49
PASS
----
TID:$07 CID:$0c
- Minimum sensor Voltage for test cycle(calculated)
Max: 0
Test result value: 65,491
FAIL
----
TID:$07 CID:$0d
- Minimum sensor Voltage for test cycle(calculated)
Max: 1
Test result value: 2
FAIL
----
TID:$0c CID:$20
- Misfire counts for last/current driving cycles(calculated)
Max: 0
Test result value: 33,536
FAIL
----
TID:$02 CID:$04
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$10
- Lean to Rich sensor threshold voltage(constant)
Min: 79
Test result value: 79
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Min: 250
Test result value: 171
FAIL
----
TID:$02 CID:$20
- Lean to Rich sensor threshold voltage(constant)
Max: 250
Test result value: 15
PASS
----
TID:$02 CID:$26
- Lean to Rich sensor threshold voltage(constant)
Max: 100
Test result value: 8
PASS
----
TID:$02 CID:$30
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$31
- Lean to Rich sensor threshold voltage(constant)
Max: 110
Test result value: 138
FAIL
----
TID:$02 CID:$40
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$46
- Lean to Rich sensor threshold voltage(constant)
Min: 65
Test result value: 65
PASS
----
TID:$06 CID:$35
- Lean to Rich sensor switch time(calculated)
Max: 111
Test result value: 47
PASS
----
TID:$06 CID:$41
- Lean to Rich sensor switch time(calculated)
Max: 342
Test result value: 49
PASS
----
TID:$07 CID:$0c
- Minimum sensor Voltage for test cycle(calculated)
Max: 0
Test result value: 65,491
FAIL
----
TID:$07 CID:$0d
- Minimum sensor Voltage for test cycle(calculated)
Max: 1
Test result value: 2
FAIL
----
TID:$0c CID:$20
- Misfire counts for last/current driving cycles(calculated)
Max: 0
Test result value: 33,536
FAIL
----
End of report.
Lo primero que debe hacer es sacar la EGR del circuito. Una manera rápida y fácil de hacer esto es cortar una vieja lata de aceite de metal (es lo suficientemente delgada como para usar una tijera) para que tenga una parte de la lata que quepa entre los pernos de la EGR. Apriete los pernos de EGR con la lata actuando como una junta. Ahora intente observar el voltaje del sensor MAF mientras acelera el motor bruscamente y vuelva a apagarlo tan pronto como aumente las revoluciones. Un buen voltaje MAF aumentará a alrededor de 4 voltios. El aumento de voltaje a alrededor de 4 voltios demostrará que el MAK está bien. Puede probar el voltaje MAF como una prueba de antes y después de que se bloquee el EGR. Si obtiene una mejora, sabe que es la EGR la culpable. Mirando su descripción de la falla, debe ser crítico con la EGR, ya que una EGR defectuosa le dará una gran cantidad de códigos 'fantasma', lo que parece ser el caso.