Year of Manufacture *: 2001 Engine Size and Code *: 2.0L AQY ( Optional ) Scanner Used: VCDS ( Optional) Fault Codes: P0172
Hello all
I have the above vehicle that when driven on a run the fault code of P0172 - Fuel Trim; Bank 1: System Too Rich appears
Freeze Frame Data for address 10 PID02 DTC that caused freeze frame data storage: P0172 PID03 Fuel system 1/2 status: Closed loop, using O2 sensors PID04 Calculated load value: 4.3 % PID05 Engine coolant temperature: 96 °C PID06 Short Term Trim - Bank 1: -15.6 % PID07 Long Term Trim - Bank 1: 5.5 % PID12 Engine RPM: 807 /min PID13 Vehicle speed: 0 km/h
Have looked at live data and have found that when the purge solenoid is is being controlled by the ECU the fuel trim Quickly goes approx 12% lean to correct a rich mixture then after about 30 sec the fuel trims go approx 12% rich to correct a lean mixture for several minutes
Is this usual for this model? as i thought that the engine calibration would be pre programed to to compensate opening the purge solenoid
Got a little side tracked with the fuel trims going high and low when the evap solenoid was being controlled by the ECU
Took your advice and put a new BOSCH MAF on it
And you were spot on... THANKS!
with the new MAF sensor fitted the Fuel trims were similar when the evap was being controlled.
but now was able to complete and pass an OBD drive cycle in only a couple of miles
Thanks for your help most appreciated as i think i was going to go off in a time wasting excersise chasing N.F.F with the EVAP system
Terry Wood
------------------------------------------------- Thursday,12,August,2010,11:31:49:23728 VCDS Version: Release 10.6.0 Data version: 20100630
Mode 01 - PID 01 : Readiness -- Address 10
Number of DTCs stored: 0 -- MIL Status: MIL OFF Misfire monitoring: Passed Fuel System: Passed Comprehensive Components: Passed Catalyst monitoring: Passed Heated catalyst monitoring: Not installed. Evaporative system monitoring: Passed Secondary air system monitoring: Passed A/C system refrigerant monitoring: Not installed. Oxygen sensor monitoring: Passed Oxygen sensor heater monitoring: Passed Exhaust Gas Recirculation: Not installed.
on August 12, 2010, 1:13 am, in reply to "