[Z06] PO174 PO171 Codes
07-04-2014, 01:37 PM
#1
Racer
Thread Starter
PO174 PO171 Codes
So if anyone recalls reading my thread on a CEL 2 weeks ago, I had cleared the code as the car was running fine, but came back again yesterday. I took it to a local auto shop and PO174/PO171 came up. I assume this may be due to me recently installing my AIR Raid intake, and maybe the MAF got dirty? Any insight would be great. Car is all stock other than the air raid and mild 2 wild. TIA
07-04-2014, 04:42 PM
#3
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Location: Charlotte, NC (formerly Endicott, NY)
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It could be quite simple to fix. Here is a list of things to check:
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between 0-19 percent.
If not within the specified range, inspect for the following:
• With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.
=⇒ Refer to DTC P0106 if the MAP sensor does not indicate the correct barometric pressure.
• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
=⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.
• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.
• Insufficient fuel in the tank
• Low fuel pressure--Refer to Fuel System Diagnosis.
• Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.
• Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust.
• Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
• The air induction system and the air intake ducts for leaks or for a missing air filter element
• A cracked EVAP canister
• Evaporative pipes obstructed or leaking
• The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis.
• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
• The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
• Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.
Bill
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between 0-19 percent.
If not within the specified range, inspect for the following:
• With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.
=⇒ Refer to DTC P0106 if the MAP sensor does not indicate the correct barometric pressure.
• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
=⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.
• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.
• Insufficient fuel in the tank
• Low fuel pressure--Refer to Fuel System Diagnosis.
• Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.
• Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust.
• Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
• The air induction system and the air intake ducts for leaks or for a missing air filter element
• A cracked EVAP canister
• Evaporative pipes obstructed or leaking
• The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis.
• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
• The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
• Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.
Bill
07-04-2014, 06:34 PM
#4
Melting Slicks
It could be quite simple to fix. Here is a list of things to check:
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between 0-19 percent.
If not within the specified range, inspect for the following:
• With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.
=⇒ Refer to DTC P0106 if the MAP sensor does not indicate the correct barometric pressure.
• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
=⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.
• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.
• Insufficient fuel in the tank
• Low fuel pressure--Refer to Fuel System Diagnosis.
• Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.
• Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust.
• Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
• The air induction system and the air intake ducts for leaks or for a missing air filter element
• A cracked EVAP canister
• Evaporative pipes obstructed or leaking
• The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis.
• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
• The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
• Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.
Bill
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between 0-19 percent.
If not within the specified range, inspect for the following:
• With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.
=⇒ Refer to DTC P0106 if the MAP sensor does not indicate the correct barometric pressure.
• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
=⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.
• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.
• Insufficient fuel in the tank
• Low fuel pressure--Refer to Fuel System Diagnosis.
• Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.
• Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust.
• Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
• The air induction system and the air intake ducts for leaks or for a missing air filter element
• A cracked EVAP canister
• Evaporative pipes obstructed or leaking
• The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis.
• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
• The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
• Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.
Bill
07-05-2014, 09:28 PM
#6
07-05-2014, 09:33 PM
#7
as soon as you can. NO latter then 5 miles or 2 recode/reset your system. shut her down an restart her/ reboot the comp.
07-05-2014, 11:09 PM
#8
Racer
Thread Starter
I'm not driving it until it's fixed. It's been a garage ornament for about 25% of the time I have owned it which hasn't been fun. I have been considering to take it to HPSales in West Palm so they can have a look at the codes, see if it's a faulty MAF or if I have a loose vacuum line, or maybe I didn't install my intake correctly? Then they can tune it after that while I'm there, which would give me the peace of mind that I'm not running lean as the codes would suggest