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Home >> Toyota >> 2008 >> Matrix Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System (1ZZ-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

Fuel-trim: 

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present P0010 (VVT VSV), P0011, P0012 (VVT system-Advance, Retard), P0031, P0032 (O2 sensor heater sensor 1), P0031, P0032 (A/F sensor heater sensor 1), P0100, P0102, P0103 (MAF sensor), P0115, P0117, P0118 (ECT sensor), P0120, P0122, P0123, P220, P0222, P0223, P2135 (TP sensor), P0125 (Insufficient ECT for closed loop), P0335 (CKP sensor), P0340, P0341 (CMP sensor), P0351, P0352, P0353, P0354 (Igniter), P0500 (VSS)
Fuel system status Closed-loop for more than 13 seconds
Battery voltage 11 V or more
Throttle position learning Completed
Either of following conditions A or B set -
A. Engine RPM Less than 1,100 rpm
B. Intake air amount per revolution 0.22 g/rev or more
Catalyst monitor Not executed