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Old 02-18-2004, 05:21 PM
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Just had a code read, what does it mean?

Hey guys, this isn't exactly a hotrod question, but I think ya'll will still be able to help me some.

The car: 2001 Chevy Malibu LS, 3100 V6, auto tranny, OBD II obviously.

The code: P1404
Troubleshooting Code P1404
IAT - B Cicrut Malfunction / EGR Temperature Sensor Circut

I know that the IAT is the Intake Air Temperature, and I think the EGR is the Exahust Gas Regulater. Does this mean one of the 2 is going out? Lemme know what you think. Thanks guys.

Chris

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Old 02-18-2004, 10:30 PM
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crud will get built up around the EGR (exhaust gas recirculating)
valve sensor.
it happend to my bro inlaws 99 F250. changed the sensor and
found the old one to be pluged up.
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Old 02-18-2004, 11:32 PM
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Is the EGR the same thing as the PCV valve?

Chris
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Old 02-18-2004, 11:49 PM
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No the PCV vents the crankcase and the EGR puts small amounts of exhaust gasses back into the intake manifold.
Scholman
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Old 02-19-2004, 11:06 PM
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Thanks guys, Ya'll rock!!

I just found this from a good bud on N-body.net

Intermittent Malfunction Indicator Lamp (MIL) and PCM DTC P1404 (Recalibrate PCM) #01-06-04-018A - (09/23/2002)

2001 Buick Century

2001 Chevrolet Impala, Malibu, Monte Carlo, Venture

2001 Oldsmobile Alero, Silhouette

2001 Pontiac Aztek, Grand Am, Grand Prix, Montana

with 3.1 L or 3.4 L Engine (VINs J, E -- RPOs LG8, LA1)

This bulletin is being revised to update the calibration information to the latest available. Please discard Corporate Bulletin Number 01-06-04-018 (Section 06-Engine).

Condition
Some customers may comment on the MIL illuminating intermittently with no other driveability concerns noted. Upon investigation, the technician may find a stored PCM Diagnostic Trouble Code (DTC) P1404.

Cause
The EGR valve pintle position voltage may not correlate to anticipated PCM calibration values.

Correction

Important
Verify that the TECH2® has been updated with software version 21.000 (Released January 23, 2001), or greater before attempting the procedures in this bulletin.


Prior to recalibrating the PCM, verify the following diagnostic values with a Tech2® using the following steps:
In the Powertrain engine data menu, select F2 EGR Data. Press enter.
With key ON, engine OFF, view the EGR Position Sensor Percentage (%).
If the actual position is greater than 3.8 percent, and no other EGR codes or symptoms are present, then proceed to Step 4. Otherwise, proceed to Step 3.
If the actual EGR pintle percentage observed in Step 1.2 is less than 3.8 percent, or if other EGR codes or symptoms are present, then proceed with the published diagnostics found in SI. When the appropriate repairs are completed, proceed to Step 4.
PCM calibrations to correct this issue have been released for service. Reprogram the PCM using TIS 2000 version 1 for 2002, or later.
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline® starting January 2002, on the TIS 2000 version TIS 01/2002 data update or later.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation: J6355
Description: Module, Controller -- Reprogram
Labor Time: Use Published Labor Time


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.
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