LW2 V6-3.0L VIN R (2000)
Mass Air Flow (MAF) Sensor: Customer Interest
Engine Controls - SES Lamp ON/Multiple DTC's Set
Bulletin No.: 01-06-04-016A
Date: December 06, 2004
TECHNICAL
Subject:
Service Engine Soon (SES) Telltale Illuminated with Diagnostic Trouble Codes (DTC's) P0171, P0172, P0174 and/or P0175 (Refer to Diagnostic
Procedure in this Bulletin and Replace Mass Air Flow [MAF] Sensor, if Necessary)
Models:
2000-2003 Saturn L-Series Vehicle with V6 Engine (VIN R - RPO L81)
Attention:
Technician
Supercede:
This bulletin is being revised to include DTC's P0172 and P0175 as well as the addition of 2002 and 2003 model years.
Please discard Corporate Bulletin Number 01-06-04-016 (Section 06 - Engine), Saturn Bulletin Number 01-T-17.
Condition
Some customers may comment that the SES telltale is illuminated.
Cause
This condition may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel
pressure, Engine Control Temperature (ECT) Sensor reading inaccurate, EVAP system problem and/or poor fuel quality.
Correction
Follow current Service Manual Diagnostic Information for DTC's P0171, P0172, P0174 or P0175. If long term fuel trim values approach DTC limits,
follow the procedure outlined in this bulletin for additional diagnosis and MAF sensor replacement.
Procedure
1.
For lean DTC's, check for vacuum leaks due to damaged or loose intake manifold switchover valve vacuum lines mis-routed, missing 0-ring
located between the intake manifold lower section and the intake manifold upper section and correct if necessary. For rich DTC's, check EVAP
purge solenoid for sticking open. Verify ECT sensor is providing accurate temperature for proper engine fuel metering.
2.
Check for proper engine oil level.
^
If oil level is correct, proceed to next step.
^
If oil level is too high, perform the following:
-
Drain oil to correct level.
-
Clean oil from throttle body and air tubing leading to oil separator.
