Tip & How-To about Mitsubishi Lancer

Car Air Conditioners

If your are sure that the destination is close by, please try to switch off the A/C. You will save a lot of fuel allowing the engine to trim back the temperature before switching off.
This would also improve the life of the A/C specially if you can switch off when the thermostat has switched off.
If you repeat this it would be good so that you will never crack the engine witht he A/C powered on. Your battery life will improve without any strain on the starter.

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2001 chevy tahoe code po440, po171


DTC P0171 or P0174
Circuit Description
The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during open and closed loop. During open loop, the PCM determines fuel delivery based on sensor signals without oxygen sensor input. During closed loop, the oxygen sensor inputs are added and used by the PCM to calculate short and long term fuel trim fuel delivery adjustments. If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent. If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the PCM detects an excessively lean condition, this DTC will set.

Diagnostic Aids
• The system will go lean if an injector is not supplying enough fuel.
• A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.
• Use a scan tool in order to review the Failure Records . If an intermittent condition is suspected, refer to Intermittent Conditions .
With every DTC a diagnostic flow chart is given for a diagnostic direction .(thing's to test ) For these test's you need a professional or factory scanner ! Plus knowledge of how these system's work would be nice .

Test Description
The numbers below refer to the step numbers on the diagnostic table.
If conditions were not corrected, refer to Fuel System Diagnosis for a possible fuel problem.
If conditions were not corrected, a worn cam, worn intake or exhaust valves, or other engine mechanical failure may be the problem.

Step
Action
Values
Yes
No
1
Did you perform the Diagnostic System Check-Engine Controls?
--
YES - Go to Step 2
NO - Go to Diagnostic System Check - Engine Controls
2
Important: If any DTCs other than P0171 or P0174 are set, refer to those DTCs before continuing
Install a scan tool.
Start and idle the engine at the normal operating temperature in closed loop.
Record the Long Term Fuel Trim.
Turn OFF the engine.
Turn ON the ignition, with the engine OFF.
Review the Freeze Frame/Failure Records and record the displayed data for this DTC.
Does the scan tool indicate that the Long Term Fuel Trim is greater than the specified value?
23%
YES - Go to Step 3
NO - Go to Diagnostic Aids
3
Operate the engine at idle.
Observe the HO2S parameter with a scan tool.
Does the scan tool indicate that the parameter is within the specified range and fluctuating?
200-800 mv
YES - Go to Step 4
NO - Go to Step 5


DTC P0440
The EVAP LARGE LEAK TEST is based on applying vacuum to the EVAP system and monitoring the rate of vacuum decay. The powertrain control module (PCM) uses the input from the fuel tank pressure (FTP) sensor in order to determine the rate of vacuum decay. At an appropriate time, the PCM turns the EVAP canister purge valve ON (open) and the EVAP canister vent valve ON (closed). This allows the engine to draw a vacuum on the system. At a calibrated time or vacuum level, the PCM turns the purge valve OFF (closed), and tests the system vacuum. If the system is unable to achieve the calibrated vacuum level, the PCM will set DTC P0440.
This could be caused by a leaking purge valve . Do you know what that is ? Mounted on the engine ,under the plastic engine cover . Disconnect the hose that goes to the vapor canister under the back of the vehicle . With the engine running see if you can feel vacuumn . If you do replace it .

Dec 15, 2017 | Chevrolet Tahoe Cars & Trucks

1 Answer

engine rough idle


this could be a lot of different things.going on here could be bad gas, clogged fuel injectors, fuel filter, fuel trim, bad pkugs and wires please tell more and what have you replaced

Dec 04, 2013 | Nissan Frontier Cars & Trucks

1 Answer

code P2187 on 2008 Suzuki Forenza


DTC P2187: Fuel Trim System Lean at Idle

Fuel Trim Description
The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without Heated Oxygen Sensor (HO2S) input. During Closed Loop, the HO2S inputs are added and used by the ECM to calculate short and long term fuel trim fuel delivery adjustments. If the HO2S indicate a lean condition, fuel trim values will be above 0%. If the Heated Oxygen Sensors (HO2S) indicate a rich condition, fuel trim values will be below 0%. Short term fuel trim values change rapidly in response to the HO2S signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7 : 1.

This code can only set when the engine control is in Closed Loop. The engine must be fully warmed up.

This must be diagnosed using a scan tool that can read engine data in order to determine the actual cause of the problem. It can be caused by the following things:

> Vacuum leaks
> Malfunctioning, dirty, or skewed Mass Airflow Sensor (MAF)
> Malfunctioning or skewed Manifold Absolute Pressure Sensor (MAP)
> Dirty or sticking injectors
> Malfunctioning or improperly programmed Powertrain Control Module (PCM)

Aug 17, 2011 | Suzuki Forenza Cars & Trucks

2 Answers

function of oxygen sensor?


It measures the oxygen in the exhaust system, for instance, if the fuel is to rich it sends values to the computer and the computer will adjust the fuel and timing to bring it back into perimeters

Jun 20, 2010 | 2003 Mitsubishi Galant

1 Answer

p1165 code in my 2001 hyundai santa fe?


I'm not quite sure about the code in Hyundai's case but it definitely relates to fuel trim...

I could try to hash down the explanation for Short term fuel trim and Long term fuel trim in this post but I think a visit to
http://www.wellsmfgcorp.com/pdf/counterp_v6_i4_2002.pdf
would be more thorough and appropriate.

Basically, a high value of long term fuel trim indicates that your engine has had and will have to continue to inject a lot more or a lot less fuel to attain the correct air/fuel ratio for a proper burn, which mainly indicates a malfunction somewhere (could be lots of things)

Aug 27, 2008 | 2001 Hyundai Santa Fe

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