Table of Contents
Advertisement
Grounding Point: Technical Service Bulletins Engine Controls - Powertrain Grounds
Model All Model
Group Fuel System(14)
Number KT2009083101
Date Monday, August 31, 2009
Area N.America
Subject Powertrain Grounds
- Description
Powertrain Grounds
Upon encountering powertrain DTC's, check that the powertrain main ground is good before
attempting any repairs.
When diagnosing any "P" or "C" Diagnostic Trouble Code (DTC) in which normal diagnostic steps
do not quickly reveal the problem, check that the powertrain assembly is properly grounded to the
body/chassis/battery.
Powertrain assemblies all have at least one ground to body/chassis/battery and in some cases
more. A poorly grounded powertrain assembly does not necessarily produce a "string" of DTC's;
check the connections even if you only retrieve one or two DTC's. Not identifying the poor ground
can (and does) lead to many hours being spent and parts being replaced unneccessarily.
Be aware that a quick voltage drop check between the powertrain and body/chassis/battery while
at engine idle or in the shop under low load conditions may not reveal this concern. Powertrain
ground requirements increase linearly (and substantially) with higher RPM/load conditions. It may
be necessary to drive the vehicle under similar RPM/load conditions as when the code set while
taking voltage drop recordings with a "min/max" capable digital volt meter.
Any indications of poorly grounded powertrain assembly should be investigated and corrected prior
to performing any further in-depth repairs.
Advertisement
Table of Contents
