Chevrolet Silverado / GMC Sierra. Manual - part 364
Fig. 463: Measuring The Retracted Position
Courtesy of GENERAL MOTORS CORP.
1. Inspect the CMP magnet for the following conditions:
A damaged electrical connector
An accumulation of dirt or debris in the recessed area around the pintle
A build-up of burnt engine oil on the shaft of the pintle which may cause the pintle to
IMPORTANT: Do not energize the camshaft position (CMP) magnet using a
12-volt power supply.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
stick and not move freely within the proper range of travel
2. Holding the CMP magnet with the pintle facing upward, measure the pintle retracted
position (a). Record the dimension.
Fig. 464: Measuring The Pintle Extended Position
Courtesy of GENERAL MOTORS CORP.
3. Holding the CMP magnet with the pintle facing downward, measure the pintle extended
position (a). Record the dimension.
4. Subtract the retracted dimension from the extended dimension to determine pintle travel. A
properly moving pintle will travel 3.0-5.5 mm (0.12-0.22 in).
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
5. If the pintle of the CMP magnet is binding or does not move within the proper range of
travel, replace the CMP magnet as an assembly.
CAMSHAFT POSITION ACTUATOR SOLENOID VALVE INSPECTION (ON-VEHICLE)
Fig. 465: View Of Proper Valve Spool Position
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not use the camshaft position (CMP) actuator solenoid
valve again. Install a NEW valve during assembly. The
inspection procedure below is provided for on-vehicle
diagnostic purposes only.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
1. With the CMP magnet removed, inspect for a sticking valve spool or broken valve spool
spring.
2. Depress the valve spool into the housing. The valve should move freely with no binding or
sticking and minimal resistance inward. When released, the valve spring should return the
spool to the proper extended position (1) of 6.08-6.12 mm (0.239-0.241 in).
CAMSHAFT POSITION ACTUATOR SOLENOID VALVE INSPECTION (OFF-VEHICLE)
Fig. 466: View Of CMP Inspection Points
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not use the camshaft position (CMP) actuator solenoid
valve again. Install a NEW valve during assembly. The
inspection procedure below is provided for off-vehicle
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2