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Home >> Lexus >> 2011 >> IS F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0171-P0607) >> SFI System >> DTC P0505: Idle Control System Malfunction >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

Either of the following conditions met 1 or 2
1. Both of following conditions A and B is met -
A. Engine speed - Target engine speed Less than -100 RPM, or more than 200 RPM (A/C ON or NSW ON)
Less than -100 RPM, or more than 150 RPM (A/C off and NSW off)
B. IAC flow rate learning value 2.37 L/sec. or less, or 10.56 L/sec. or more for 5 seconds or more
2. Both of following conditions C and D is met -
C. Frequency that both of the following conditions (a) and (b) are met 5 times or more
(a) Engine speed - Target engine speed Less than -100 RPM, or more than 200 RPM (A/C ON or NSW ON)
Less than -100 RPM, or more than 150 RPM (A/C off and NSW off)
(b) Vehicle condition Stop after vehicle was driven by 6.25 mph (10km/h) or more
D. Either of following conditions (c) or (d) is met -
(c) Amount of change of IAC flow rate learning value +2.84 L/sec. or more, or -4.51 L/sec. or less
(d) IAC flow rate learning value 2.37 L/sec. or less, or 10.56 L/sec. or more