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Home >> Lexus >> 2013 >> IS 250C Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0657-U0101) & Circuit Tests) >> SFI System >> DTC P1235: High Pressure Fuel Pump Circuit >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs are not present None
Time after engine start 5 seconds or more
Injector driver relay On
Output duty cycle More than output duty ratio change map value*, and less than 95%
Battery voltage 10.5 V or more
Engine switch On (IG)
Starter Off
*: Output duty ratio change map value -
Engine speed is 500 rpm 5%
Engine speed is 2000 rpm 20%
Engine speed is 4000 rpm 40%
Engine speed is 6000 rpm 60%
Engine speed is 8000 rpm 80%