Codes 172 and 174 are a fuel problem. Here is the diagnostics for doing this. This must be a bi-fuel vehicle.
Diagnostic� Aids
Enter� this� test� only� when� all� steps� under� QUICK� TEST� have� been� successfully� completed� and� engine� still� does� not� start� or� if� directed� here� from� another� test� or� chart.� This� test� is� only� intended� to� diagnose:
? Heated� Oxygen� Sensor� (HO2S).
? HO2S� and� VPWR� circuits� and� connections.
? Compuvalve.
? Vacuum� systems.
HO2S 11� and� HO2S 21� circuits� are� monitored� by� compuvalve.� Information� is� used� by� compuvalve� for� fuel� trim� calculations.� HO2S� PID� should� vary� between� 0 0.3� and� 0.6 1.0� volt� while� engine� is� operating� at� 2000
RPM.� Also, � a� change� from� rich� to� lean� should� occur� more� than� 5� times� during� a� period� of� 10� seconds� at� 2000� RPM.� DTCs� P0132, � P0134, � P0152, � P0154, � P0171, P0172, � P0174� and� P0175� are� unique� to� alternative
fuel� system� and� are� set� if� compuvalve� receives� a� continuously� high� or� low� input� (more� than� or� less� than� 0.55� volt� for� more� than� 120� seconds), � or� no� activity� from� HO2S.� Possible� causes� for� these� faults� are:
? HO2S� circuits� are� open� or� shorted� to� ground.
? Faulty� HO2S� sensor.
? Consistently� lean� or� rich� fuel� system
? Faulty� compuvalve.
? Faulty� harness� circuits� (HO2S� or� VPWR).
? Intake� air� leaks.
? Plugged� injectors.
? Pressure� regulator� inoperative.
? Exhaust� leaks.
? PCV� system.
? Ignition� system� faults.
? Low� compression.
Codes p0405 &406 I could not find at least for eninge operation. This cold be a computer problem as well as what is listed. But it looks more like theO2 circuiit.
Image (Click to make bigger)
Wednesday, December 21st, 2011 AT 5:46 PM
