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Additional exhaust regulation

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DTC Error Message Diagnostic Procedure Malfunction Criteria and Threshold Value Secondary Parameters with Enable Conditions Monitoring Time Length Frequency of checks, MIL Illum
P0421 Catalyst System Efficiency Below Threshold (Bank 1) Amplitude ratio O2S >0.8
  • Modeled exhaust temp, 630 - 900°C
  • ECT, >60°C
  • Engine speed, 1100 - 3500 rpm
  • Delta engine speed, 350 rpm
  • Mass air flow, 0.36 - 1.4 g/rev
  • Delta mass air flow , 2.25 g/rev/s
  • EVAP canister load, low
 70 Sec.
  • Once/DCY
  • 2 DCY
P0431 Catalyst System Efficiency Below Threshold (Bank 2) Amplitude ratio O2S >0.8
  • Modeled exhaust temp, 630 - 900°C
  • ECT, >60°C
  • Engine speed, 1100 - 3500 rpm
  • Delta engine speed, 350 rpm
  • Mass air flow, 0.36 - 1.4 g/rev
  • Delta mass air flow , 2.25 g/rev/s
  • EVAP canister load, low
 70 Sec.
  • Once/DCY
  • 2 DCY
P0441 Evaporative Emission System Incorrect Purge Flow
  • Deviation lambda control 7%
  • Deviation idle control 9.7%
  • Engine speed, Idle
  • Engine speed deviation, 80 RPM
  • ECT, >69.75°C
  • Sub. ECT, >69.75°C
  • IAT, >5°C
  • IAT, at engine start->5°C
  • Altitude, 2500 M
 25 Seconds
  • Once/DCY
  • 2 DCY
P0442 Evaporative Emission System Leak Detected (Small Leak) Time for pressure drop 1.0-1.3 Sec.
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2500 M
  • Number of diagnostic attempts, 2
  • IAT, >5.25°C
  • Delta ambient pressure, 0.3 kPa
  • IAT drop after engine start, 9.75 K
  • Time after engine start, >2101200 Sec.
  • ECT at start, 4.5-35°C
  • Vehicle speed, >6 MPH
 140 Seconds
  • Once/DCY
  • 2 DCY
P0444 Evaporative Emission System Purge Control Valve Circuit Open Open circuit >0.8 mA
  • EVAP purge valve, Commanded off
  • Engine start, Completed
 2 Seconds
  • Continuous
  • 2 DCY
P0455 Evaporative Emission System Leak Detected (gross leak/no flow) Time for pressure drop 0.65-0.8 Sec.
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2500 M
  • Number of diagnostic attempts, 2
  • IAT, >5.25°C
  • Delta ambient pressure, 0.3 kPa
  • IAT drop after engine start, 9.75 K
  • Time after engine start, >2101200 Sec.
  • ECT at start, 4.5-35°C
  • Vehicle speed, >6 MPH
 140 Seconds
  • Once/DCY
  • 2 DCY
P0456 Evaporative Emission System Leak Detected (very small leak) Time for pressure drop 4.5 5.5 sec.
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2500 M
  • Number of diagnostic attempts, 10
  • IAT, >5.25°C
  • Delta ambient pressure, 0.2 kPa
  • IAT drop after engine start, 9.75 K
  • Time after engine start, >2101200 Sec.
  • ECT at start, 4.5-35°C
  • Vehicle speed, 680.7 MPH
  • Vehicle acceleration, 2.1 m/s2
 140 Seconds
  • Once/DCY
  • 2 DCY
P0458 Evaporative Emission System Purge Control Valve Circuit Low Signal voltage, 3.2 V
  • EVAP purge valve, Commanded off
  • Engine start, Completed
 2 Seconds
  • Continuous
  • 2 DCY
P0459 Evaporative Emission System Purge Control Valve Circuit High Signal current, > 1.0 A
  • EVAP purge valve, Commanded on
  • Engine start, Completed
 2 Seconds
  • Continuous
  • 2 DCY
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