Need DIC code advise.
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Instructor
Joined: Jun 2001
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Need DIC code advise.
A week ago I installed TR55 plugs, reoiled the K&N(my intake is stock with a large cutout above the filter) and removed the maft screen. I added a bottle of Lucas fuel system cleaner then filled up. After a couple of days the check engine light came on and I pulled a P0175H from the DIC which is fuel trim system rich bank 2. When I clear it it will come back after a day or two. What do you think is causing it and what do I do to correct it?
Thanks,
Steve :confused: [IMG][/IMG]
Thanks,
Steve :confused: [IMG][/IMG]
Drifting
Joined: Jul 2000
Posts: 1,517
Likes: 1
From: Stockholm
Re: Need DIC code advise. (slogan_98)
DTC P0175 Fuel Trim System Rich Bank 2
Circuit Description
The powertrain control module (PCM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The PCM monitors the heated oxygen sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim values change in response to trends in the short term fuel trim. The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. You can use a scan tool in order to monitor the short and long term fuel trim. The ideal fuel trim values are around 0 percent. A positive fuel trim value indicates that the PCM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the PCM is reducing the amount of fuel in order to compensate for a rich condition. If the PCM detects an excessively Rich or Lean condition, the PCM sets a diagnostic trouble code (DTC). The long term fuel trim diagnostic parameter is an average of several of the long term speed load learn cells which the PCM selects based on the engine speed and the engine load.
Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0300, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P0401, P0410, P0412, P0418, P0441, P0443, P0500, P0502, P0503, P1111, P1112, P1120, P1121, P1220, P1221, P1258, P1415, P1416, P1441, not set
Engine Coolant Temperature between 50°C (122°F) and 115°C (239°F)
Fuel trim enabled
Barometric Pressure greater than 74 kPa
Mass Air Flow between 5 grams per second and 90 grams per second
Manifold Absolute Pressure between 26 kPa and 90 kPa
Intake Air Temperature between -20°C (-4°F) and 115°C (239°F)
EVAP Canister purge not enabled or EVAP Canister purge duty cycle greater than 75%
Engine speed between 400 RPM and 3000 RPM
TP Sensor angle less than 90%
Vehicle speed less than 137 km/h (85 mph)
All the above conditions met for 40 seconds.
Conditions for Setting the DTC
The PCM detects the average Long Term Fuel Trim cell values are below a predetermined threshold.
Action Taken When the DTC Sets
The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails, if the diagnostic fails under the same conditions (load, RPM, temperature, etc.) as the previous ignition cycle that the test ran and failed.
The first time the diagnostic fails, the PCM records the operating conditions in Failure Records.
The second consecutive drive trip that this diagnostic fails [under the same conditions (load, RPM, temperature, etc.) as the previous ignition cycle that the test ran and failed], the PCM stores this information in Freeze Frame. The PCM copies any data previously stored in Freeze Frame and copies the data into the Failure Records. The PCM then overwrites the Freeze Frame. The only exception to this is if a Misfire DTC was already recorded in Freeze Frame. In this case, the Misfire data stays in Freeze Frame and the PCM updates the Fuel Trim data in the Failure Records.
Conditions for Clearing the MIL/DTC
The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail within the same conditions that the DTC last failed.
Important
If the last failure was during a non-typical driving condition, the MIL may remain ON longer than the three drive trips. Review the Freeze Frame/Failure Records for the last failure conditions.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
A last test failed (Current DTC) clears when the diagnostic runs and does not fail.
PCM battery voltage is interrupted.
Use a scan tool in order to clear the MIL/DTC.
Important
Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM\TAC modules.
I hope it will help in some way :)
[Modified by seanr, 8:39 PM 7/23/2002]
Circuit Description
The powertrain control module (PCM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The PCM monitors the heated oxygen sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim values change in response to trends in the short term fuel trim. The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. You can use a scan tool in order to monitor the short and long term fuel trim. The ideal fuel trim values are around 0 percent. A positive fuel trim value indicates that the PCM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the PCM is reducing the amount of fuel in order to compensate for a rich condition. If the PCM detects an excessively Rich or Lean condition, the PCM sets a diagnostic trouble code (DTC). The long term fuel trim diagnostic parameter is an average of several of the long term speed load learn cells which the PCM selects based on the engine speed and the engine load.
Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0300, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P0401, P0410, P0412, P0418, P0441, P0443, P0500, P0502, P0503, P1111, P1112, P1120, P1121, P1220, P1221, P1258, P1415, P1416, P1441, not set
Engine Coolant Temperature between 50°C (122°F) and 115°C (239°F)
Fuel trim enabled
Barometric Pressure greater than 74 kPa
Mass Air Flow between 5 grams per second and 90 grams per second
Manifold Absolute Pressure between 26 kPa and 90 kPa
Intake Air Temperature between -20°C (-4°F) and 115°C (239°F)
EVAP Canister purge not enabled or EVAP Canister purge duty cycle greater than 75%
Engine speed between 400 RPM and 3000 RPM
TP Sensor angle less than 90%
Vehicle speed less than 137 km/h (85 mph)
All the above conditions met for 40 seconds.
Conditions for Setting the DTC
The PCM detects the average Long Term Fuel Trim cell values are below a predetermined threshold.
Action Taken When the DTC Sets
The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails, if the diagnostic fails under the same conditions (load, RPM, temperature, etc.) as the previous ignition cycle that the test ran and failed.
The first time the diagnostic fails, the PCM records the operating conditions in Failure Records.
The second consecutive drive trip that this diagnostic fails [under the same conditions (load, RPM, temperature, etc.) as the previous ignition cycle that the test ran and failed], the PCM stores this information in Freeze Frame. The PCM copies any data previously stored in Freeze Frame and copies the data into the Failure Records. The PCM then overwrites the Freeze Frame. The only exception to this is if a Misfire DTC was already recorded in Freeze Frame. In this case, the Misfire data stays in Freeze Frame and the PCM updates the Fuel Trim data in the Failure Records.
Conditions for Clearing the MIL/DTC
The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail within the same conditions that the DTC last failed.
Important
If the last failure was during a non-typical driving condition, the MIL may remain ON longer than the three drive trips. Review the Freeze Frame/Failure Records for the last failure conditions.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
A last test failed (Current DTC) clears when the diagnostic runs and does not fail.
PCM battery voltage is interrupted.
Use a scan tool in order to clear the MIL/DTC.
Important
Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM\TAC modules.
I hope it will help in some way :)
[Modified by seanr, 8:39 PM 7/23/2002]
Instructor
Joined: Nov 2001
Posts: 120
Likes: 0
From: Milford CT
Re: Need DIC code advise. (slogan_98)
It's running rich from removing the screen. The PCM is trying to level out your fuel trims now that it senses the change in air intake. It will most likley settle down after a few cycles.
