Engine Controls - DTC P0140 Manual Revision
File In Section: 06 - Engine/Propulsion SystemBulletin No.: 02-06-04-011
Date: March, 2002
SERVICE MANUAL UPDATE
Subject:
Revised DTC P0140
Models:
1998-1999 Chevrolet Malibu
1998-2001 Chevrolet Cavalier
2002 Chevrolet Cavalier (2.4L Only)
1998 Oldsmobile Achieva
1999-2001 Oldsmobile Alero
1998-2001 Pontiac Grand Am
1998-2001 Pontiac Sunfire
2002 Pontiac Sunfire (2.4L Only)
2000-2002 Chevrolet and GMC S/T Pick Up Models (Sonoma, S10)
with 2.2L or 2.4L Engine (VINs 4, 5, T - RPOs LN2, L43, LD9)
This bulletin is being issued to revise DTC P0140 in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI2000. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. After the ignition is turned ON, the H025 heater heats up causing the H025 signal voltage to either increase or decrease. This indicates that the H025 heater is OK.
3. If the H025 voltage changes more than the specified value, the condition is not present.
5. If the voltage is below the specified value, the high signal circuit, the low signal circuit, and the PCM are OK.
6. If the voltage is above the specified value, the low signal circuit is OK.
14. Resistance below the specified value indicates the H025 heater is shorted.
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