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Home >> Lexus >> 2007 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0657 - P2A03 >> DTC P1441, P1444, P2440: Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1; Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2; Secondary Air Injection System Switching Valve Stuck Open Bank1 >> Typical Enabling Conditions

Typical Enabling Conditions

All: 

TYPICAL ENABLING CONDITIONS

This monitor will run whenever these DTC are not present P0010 - P0022 (VVT system)
P0031 - P0052 (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 (Ignitor)
P0455, P0456 (EVAP system)
P0450 - P0453 (EVAP press sensor)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor (open) - sensor 1)
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 109 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