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Home >> Toyota >> 2009 >> Tundra Base, 4.0 U >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Control System (2TR-FE)) >> SFI System >> DTC P0171 System Too Lean (Bank 1); DTC P0172 System Too Rich (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

WARNING: This page is about a different car, the 2009 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS CHART

Monitor runs whenever following DTCs not present P0010 (OCV Bank 1)
P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0031, P0032 (A/F sensor heater)
P0100 - P0103 (MAF meter)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0335 (Crankshaft position sensor)
P0340 (Camshaft position sensor)
P0412, P0418, P1613 (Secondary air injection system control)
P0500 (VSS)
P2440 - P2445 (Secondary air injection system)
Fuel system status Closed-loop
Battery voltage 11 V or more
Catalyst Monitor Not executed
Either of following conditions A or B set -
A. Engine RPM Below 1100 rpm
B. Intake air amount per revolution 0.22 g/rev. or more