2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines 2005 MY OBD System Operation Summary for Gasoline Engines
0$Secondary air systems typically utilize an electric air pump as well as one or two electrically controlled checkvalves to deliver air into the exhaust manifold.The only vehicle which uses secondary air in the 2005 MY is the 2.3L PZEV Focus. The Focus uses a systemwith ported air. This means that airflow is delivered to each individual exhaust port. The secondary air pump isenergized soon after start-up while the fuel system is in open loop and icing conditions are not likely. After the O2sensors warm up, the secondary air pump continues to be energized while the fuel system goes into closed loopfuel. The secondary air system continues to run in closed loop fuel until the air pump is de-energized. The typicaltime period in which the AIR pump is energized is approximately 12 seconds.The AIR pump flow check monitors the HO2S signal at idle to determine if secondary air is being delivered intothe exhaust system. The air/fuel ratio is commanded open-loop rich, the AIR pump is turned on and the timerequired for the HO2S signal to go lean is monitored. If the HO2S signal does not go lean within the allowabletime limit, a low/no flow malfunction is indicated. (P0411)The electric air pump draws high current and must be energized through a separate relay. Both the primary andsecondary circuits are checked for opens and shorts. First, the output driver within the PCM (primary circuit) ischecked for circuit continuity (P0412). This circuit energizes the relay and the vacuum-operated check and controlvalve(s). Next, a feedback circuit from the secondary side of the relay to the PCM is used to check secondarycircuit continuity (P2257, P2258).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 14 OF 131
AIR Monitor Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0411 functional check,P0412 primary side circuit checkP2257, P2258 secondary side circuit checksFunctional - once per driving cycle, circuit checks - continuousOxygen sensor monitor complete and OKECT, IAT, no fuel system DTCs20 seconds at idleTypical AIR functional check entry conditions:Entry condition Minimum MaximumTime since engine start-upEngine Coolant Temperature600 seconds150 o FShort Term Fuel Trim not too lean 5.0%Fuel Tank Pressure4.5 in H 2 OClosed Throttle at idle rpm at idle rpmPurge Duty Cycle 20%Purge Fuel Flow 0 lb/min 0.2 lb/minBattery Voltage11 voltsNote: No P0411 DTC is stored if IAT < 20 o F at the start of the functional test although the test runs.(Precludes against identifying a temporary, frozen check valve.)Typical AIR functional check malfunction thresholds:Minimum time allowed for HO2S sensor to indicate lean: < 4 secondsJ1979 Secondary Air Mode $06 DataTest ID Comp ID Description for J1850 Units$30 $11 HO2S11 voltage for upstream flow test and rich limit volts$30 $21 HO2S21 voltage for upstream flow test and rich limit volts$31 $00 HO2S lean time for upstream flow test and time limit secondsMonitor ID Test ID Description for CAN Units$71 $80 HO2S11 voltage for upstream flow test and rich limit volts$71 $81 HO2S21 voltage for upstream flow test and rich limit volts$71 $82 HO2S lean time for upstream flow test and time limit secondsConversion for Test ID $30: multiply by 0.00098 to get voltsConversion for Test ID $31: multiply by 0.125 to get secondsFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 15 OF 131
- Page 1: Table of ContentsIntroduction - OBD
- Page 4 and 5: !The Catalyst Efficiency Monitor us
- Page 6 and 7: TYPICAL INDEX RATIO CATALYST MONITO
- Page 8 and 9: There are three different misfire m
- Page 10 and 11: 0#1The acceleration that a piston u
- Page 12 and 13: J1979 Misfire Mode $06 DataTest ID
- Page 16 and 17: 201 34536/#/Vehicles that meet enha
- Page 18 and 19: 0.040” EVAP Monitor Operation:DTC
- Page 20 and 21: 201 3536/#/Some vehicles that meet
- Page 22 and 23: slosh. If the monitor aborts, it wi
- Page 24 and 25: 0.020” EVAP Monitor Operation:DTC
- Page 26 and 27: Test ID Comp ID Description for J18
- Page 28 and 29: Ford's EONV implementation for Cali
- Page 30 and 31: 1#4;!In this phase, the EONV test i
- Page 32 and 33: 0.020” EONV EVAP Monitor Operatio
- Page 34 and 35: 201!!#/Additional malfunctions that
- Page 36 and 37: Fuel Tank Pressures Sensor Offset C
- Page 38 and 39: :As fuel system components age or o
- Page 40 and 41: -:-The time between HO2S switches i
- Page 42 and 43: $-A functional test of the rear HO2
- Page 44 and 45: -- 3 amps, (NTK)< 0.400 amps or > 3
- Page 46 and 47: 1:$The Delta Pressure Feedback EGR
- Page 48 and 49: If an EGR system malfunction is det
- Page 50 and 51: After the vehicle has warmed up and
- Page 52 and 53: 1:$In the 2002.5 MY, Ford introduce
- Page 54 and 55: The ESM may provide the PCM with a
- Page 56 and 57: Next, the differential pressure ind
- Page 58 and 59: I/M Readiness IndicationIf the infe
- Page 60 and 61: The Stepper Motor EGR Monitor consi
- Page 62 and 63: Note: BARO is inferred at engine st
0$Secondary air systems typically utilize an electric air pump as well as one or two electrically controlled checkvalves to deliver air into the exhaust manifold.The only vehicle which uses secondary air in the <strong>2005</strong> <strong>MY</strong> is the 2.3L PZEV Focus. The Focus uses a systemwith ported air. This means that airflow is delivered to each individual exhaust port. The secondary air pump isenergized soon after start-up while the fuel system is in open loop and icing conditions are not likely. After the O2sensors warm up, the secondary air pump continues to be energized while the fuel system goes into closed loopfuel. The secondary air system continues to run in closed loop fuel until the air pump is de-energized. The typicaltime period in which the AIR pump is energized is approximately 12 seconds.The AIR pump flow check monitors the HO2S signal at idle to determine if secondary air is being delivered intothe exhaust system. The air/fuel ratio is commanded open-loop rich, the AIR pump is turned on and the timerequired <strong>for</strong> the HO2S signal to go lean is monitored. If the HO2S signal does not go lean within the allowabletime limit, a low/no flow malfunction is indicated. (P0411)The electric air pump draws high current and must be energized through a separate relay. Both the primary andsecondary circuits are checked <strong>for</strong> opens and shorts. First, the output driver within the PCM (primary circuit) ischecked <strong>for</strong> circuit continuity (P0412). This circuit energizes the relay and the vacuum-operated check and controlvalve(s). Next, a feedback circuit from the secondary side of the relay to the PCM is used to check secondarycircuit continuity (P2257, P2258).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 14 OF 131
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