Engine light
#1
Engine light
Hi guys, was driving to work tis morning and my check engine light came on, i plugged the scanner in and it came up with a fault code saying that the vehicle was over fuelling, but when i did an emissions test the air fuel ratio at the exhaust came out at 14.7 : 1 which is bang on what its meant to be, i ran a couple tests and got the readings below
#5
POSSIBLE CAUSE
Misfire
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― MAF sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• A/F sensor heater malfunction
• A/F sensor malfunction
― Looseness A/F sensor
― A/F sensor deterioration
• MAF sensor malfunction
• Fuel supply system malfunction or improper fuel line pressure
― Pressure regulator malfunction
― Fuel pump unit malfunction
― Fuel leakage on fuel line from fuel delivery pipe and fuel pump
― Fuel filter clogged or restricted
― Fuel return hose clogged
• Improper connection of purge control system
• Improper operation of EGR valve system
• Improper operation of variable tumble solenoid valve
• Improper operation of PCV valve
• PCM malfunction
Misfire
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― MAF sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• A/F sensor heater malfunction
• A/F sensor malfunction
― Looseness A/F sensor
― A/F sensor deterioration
• MAF sensor malfunction
• Fuel supply system malfunction or improper fuel line pressure
― Pressure regulator malfunction
― Fuel pump unit malfunction
― Fuel leakage on fuel line from fuel delivery pipe and fuel pump
― Fuel filter clogged or restricted
― Fuel return hose clogged
• Improper connection of purge control system
• Improper operation of EGR valve system
• Improper operation of variable tumble solenoid valve
• Improper operation of PCV valve
• PCM malfunction
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trace66usa
Mazda Protege
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07-03-2008 04:08 PM