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Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2UZ-FE) >> SFI System >> DTC P1441 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1; DTC P1444 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2; DTC P2440 Secondary Air Injection System Switching Valve Stuck Open Bank 1 >> Typical Enabling Conditions

Typical Enabling Conditions

All: 

TYPICAL ENABLING CONDITIONS

This monitor runs whenever these DTCs are not present
  • P0010 - P0022: VVT system
  • P0031 - P0052: Front A/F sensor heater
  • P0100 - P0103: MAF sensor
  • P0110 - P0113: IAT sensor
  • P0115 - P0118: ECT sensor
  • P0120 - P0223, P2135: TP sensor
  • P0125: Closed loop
  • P0171, P0172: Fuel trim
  • P0300 - P0308: Misfire
  • P0327 - P0333: Knock sensor
  • P0335: CKP sensor
  • P0340 - P0346: VVT sensor
  • P0351 - P0358: Igniter
  • P0450 - P0453: EVAP pressure sensor
  • P0455 - P0456: EVAP system
  • P0500: VSS
  • P2196, P2198: A/F sensor (rationality)
  • P2237, P2240: A/F sensor (open)
  • P2430 - P2433: AIR pressure sensor
  • P2A00, P2A03: A/F sensor (slow response)

Case 1: 

TYPICAL ENABLING CONDITIONS

Atmospheric pressure 45 kPa (420 mmHg) or higher
Battery voltage 11.5 V or higher

Case 2: 

TYPICAL ENABLING CONDITIONS

Atmospheric pressure 45 kPa (420 mmHg) or higher
Battery voltage 11.5 V or higher
AIR pump OFF
Time after engine start 10 seconds or more
AIR valve bank 1 OFF
AIR valve bank 2 OFF
AIR status OFF
Engine load 0 % or more
Intake air amount 40 g/sec. or more
IAT at engine start -15°C (5°F) or higher
ECT at engine start Lower than 5°C (41°F)
AIR valve ON
Engine RPM Lower than 3,750 rpm

Case 3: 

TYPICAL ENABLING CONDITIONS

Cumulative intake air amount 172 g/sec. or more
AIR pump OFF
AIR valve OFF
AIR valve bank 1 OFF
AIR valve bank 2 OFF
Engine RPM Lower than 3,750 rpm
AIR status OFF
AIR monitor runs in accordance with the monitor sequence 1 to 5 -
Monitor Sequence 1
Idle ON
AIR status ON
AIR pump ON
AIR valve ON
Either of following conditions 1 or 2 is met -
1. Both of the following conditions are met -
  • AIR valve bank 1
 ON
  • AIR valve bank 2
 OFF
2. Both of the following conditions are met -
  • AIR valve bank 1
 OFF
  • AIR valve bank 2
 ON
Monitor Sequence 2
Idle ON
AIR valve ON
AIR VSV bank 1 ON
AIR VSV bank 2 ON
Monitor Sequence 3
Engine RPM Less than 3,750 rpm
AIR status ON
AIR pump ON
AIR valve ON
AIR valve bank 1 ON
AIR valve bank 2 ON
Monitor Sequence
4-1 Runs when AIR pressure did not change at monitor sequence 2
Engine RPM Less than 3,750 rpm
AIR status OFF
AIR pump ON
AIR valve ON
Either of following conditions 1 or 2 is met -
1. Both of the following conditions are met -
  • AIR valve bank 1
 ON
  • AIR valve bank 2
 OFF
2. Both of the following conditions are met -
  • AIR valve bank 1
 OFF
  • AIR valve bank 2
 ON
Monitor Sequence 4-2
Engine RPM Less than 3,750 rpm
AIR status OFF
AIR pump OFF
AIR valve OFF
AIR VSV bank 1 OFF
AIR VSV bank 2 OFF
Monitor Sequence 5
Engine RPM Less than 3,750 rpm
AIR status OFF
AIR pump OFF
AIR valve ON
AIR VSV bank 1 OFF
AIR VSV bank 2 OFF
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