Camshaft Actuator System Description
Circuit/System Description
The camshaft position actuator solenoid valve - Intake and camshaft position
actuator solenoid valve -
exhaust system enables the engin
DTC P0010, P0013, or P2088-P2091
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Diagnostic
System Check - Vehicle
Review the description of
POWER TRANSFER UNIT CASE IDENTIFICATION
The power transfer unit primary identification label (1) is located on the
rear extension housing. The power transfer
unit secondary identification stamping (2) is located on the bottom of the main
housing.
Transfer Case Primary Identification Label
GM P
Cooling Fan Description and Operation
System Overview
The engine cooling fan system consists of 2 electric cooling fans and 3 fan
relays. The cooling fan relays
are arranged in a series/parallel (S/P) configuration. This allows the engine
control module (ECM) to
operate both fans together at low o