EGR System - MIL ON/EGR DTC's Stored.: Overview
BULLETIN NO.:97-T-20AISSUE DATE: December, 1997
GROUP/SEQ. NO.: Engine-04
CORPORATION NO.: 786506R
SUBJECT:
Malfunction Indicator Lamp (SERVICE ENGINE SOON Telltale Lamp) On and EGR DTCs P0401, P0404, P0405, P1404 and/or P1406 in PCM Memory (Updated diagnosis and Install Service PCM Calibration)
This bulletin is being revised with updated diagnostic and repair information for the EGR system, bulletin 97-T-2O should be discarded.
MODELS AFFECTED:
1996-1997 Saturns
CONDITION:
The malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) may be On with diagnostic trouble codes (DTCs) P0401, P0404, P0405, P1404 and/or P1406 stored in PCM malfunction history.
CAUSE:
DTCs P1404 and P1406 may be caused by diagnostic trouble code sensitivity to debris. This debris intermittently prevents the exhaust gas recirculation (EGR) pintle from fully seating.
The diagnostic information for DTCs P0401, P0404 and P0405 has been updated to include additional failure modes of the EGR system.
IMPORTANT:
The diagnostic logic and operational logic for several DTCs were modified with the calibrations identified in the "Controller/PCM Part Number (End Model)" table. Referring to the service manual could result in mis-diagnosis and unnecessary replacement of parts.
CORRECTION:
To diagnose these conditions, refer to the diagnostic charts in this bulletin.
PROCEDURE:
Connect the Scan tool or the Service Stall System (SSS) to the vehicle and turn the ignition On.
^ The TECH-2 displays the "Controller Part Number" parameter within the "Vehicle System Information" table.
^ The portable diagnostic tool (PDT) and SSS displays the "PCM Part # " parameter within the "Vehicle ID" table.
If the Controller/PCM part number matches one of the numbers listed, proceed to the diagnostics outlined in this bulletin.
If the Controller/PCM part number does not match one of the numbers listed, then after completing the diagnostics outlined in this bulletin, reprogram the PCM.
Reprogram the PCM according to the "Controller/PCM Part Number (End Model)" table listed below. (Refer to "EEPROM Reprogramming" in the "Service Stall System User Guide.")
IMPORTANT:
Version 41.0 or greater service stall system (SSS) software is required for this flash process. Verify the SSS is version 41.0 or greater. If SSS version 41.0 or greater is not available, call Saturn Customer Support Center at 1-800-7SATURN (1-800-772-8876), prompt 3. In Canada, call 1-800-828-6860 for English, or 1-800-503-3222 for French.
IMPORTANT:
It will be necessary to perform the crankshaft learning procedure. (Refer to Technical Information Bulletin 96-T-39, and perform the Crankshaft Learning Procedure contained in the bulletin.)
CLAIM INFORMATION:
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as shown
Case Type Description Labor Operation Time
VW Install Service PC0M Code 0.3 hrs
Calibration T9772