Camshaft Position Actuator

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Welcome to Engine Repair
4200 Camshaft Position
Actuator System
Operation and Diagnosis
Module 6
PPT a1 m6 Final
Copyright 2003 General Motors Corporation
1
The material contained in
this
course component
was accurate and current
at the time of course
development.
2
Objectives
 Identify components of the
Camshaft Position Actuator
System
 Describe operation of the
Camshaft Position Actuator
System
 Diagnose operation of the
Camshaft Position Actuator
System
3
Module 1 Objectives
 Describe basic operation of the
Camshaft Position Actuator
System
 Identify benefits of the 4200
Camshaft Position Actuator
System
4
Vortec Engine
5
Torque (lb-ft)
Horsepower
4.2L L6 (LL8) “Vortec 4200”
Engine Speed (X 100)
6
Additional Features
 High Compression Ratio 10:1
 Electronic Throttle Control
 Variable Exhaust Valve Timing
 Coil-on-Plug Ignition
 Multec II Fuel Injectors
 Advanced Powertrain Control
Module
7
4200 Benefits
 Increased power output
 Broad torque band
 Improved mileage
 Improved emission control
 Eliminates external EGR system
 Smoothness and balance
 Mass reduction
8
Exhaust Gas Recirculation
External EGR:
 Exhaust from exhaust
runners/manifold diverted back to
intake manifold
 Traditional method for reducing
oxides of nitrogen (NOx) in fixed
valve timing engines
 Reduces NOx creation by reducing
combustion temperatures
9
Exhaust Gas Recirculation cont.
Internal EGR:
 Exhaust charge drawn back
into cylinder during valve
overlap
10
Vent
Supply
Vent
Cam Actuator
Solenoid
Front of
Piston
Engine
RPM
Manifold
Pressure
(MAP)
Cam
Actuator
11
Question
What are some of the
advantages of an inline engine
like the 4200 Vortec?
12
Camshaft Position Actuator
Advance
Retard
13
Powertrain Control Module
 Provides limp-home mode
 Will not engage starter when
engine already running
 Allows advanced engine
control features
 Manages electronic throttle
control (ETC)
14
Question 3
Which cam does the actuator
control and how many cam
degrees of retard does it allow?
A) Exhaust cam, 35º
B) Intake cam, 35º
C) Intake cam, 25º
D) Exhaust cam, 25º
15
Module 2 Objectives
 Identify 4200 Camshaft
Position Actuator System
 Identify 4200 Camshaft Position
Actuator
 Identify 4200 Camshaft Position
Actuator Solenoid Valve
16
Component Location
Camshaft
Position
Actuator
Solenoid
Camshaft
Position
Actuator
CMP
Sensor
PCM Location
PCM
17
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Actuator Cutaway
Actuator
Piston
Hub
Helical
Spline
19
Reluctor Wheel
Camshaft
Actuator
CMP
20
Camshaft Position Actuator
Solenoid Valve
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Module 3 Objectives
 Identify 4200 Camshaft
Position Actuator System
Components
 Describe 4200 Camshaft
Position Actuator System
Operation
22
System Advantages
 Improves emissions compared to
conventional EGR system
reduces hydrocarbons by up
to 25%
reduction of oxides of nitrogen
by up to 40%
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Camshaft Position Sensor
Camshaft
Actuator
CMP
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Oil Flow Diagram
25
Camshaft Position
Actuator Purpose
 Internal EGR
 Fuel economy improvement
 Emissions improvement
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Operation
 Operational range
– 25º of exhaust cam timing retard
 Camshaft Position Actuator only
operates
– above 1200 RPM
 Intake charge is diluted with exhaust
gas in the combustion chamber
– similar to EGR
– amount of dilution varies as
required by PCM
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Timing
Chain
28
Timing
Chain
Close-Up
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Timing
Chain
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Module 4 Objective
 Diagnose operation of
4200 Camshaft Position
Actuator System
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Camshaft Position Actuator
System DTCs
P0013
– Exhaust Camshaft Position
Actuator Control Circuit
 P0014
– Exhaust Camshaft Position
System Performance
 P1345
Crankshaft Position (CKP)
Camshaft Position Correlation

32
On-Vehicle Service
 Camshaft Position Actuator
Solenoid Valve
– remove power steering pump
first
 Camshaft Position Actuator
– see Service Information
 PCM and wiring
see Service Information
33
Conditions for Setting P0013
1. Low reference circuit - open
2. High control circuit (open
or grounded)
3. Poor connections at the PCM
4. Poor connections at the
solenoid
5. PCM fault
6. Camshaft Position solenoid fault
34
Conditions for Setting P0014
1. Camshaft Position solenoid fault
2. Excessive timing chain play
3. Camshaft Position Actuator
mechanical fault
4. Poor connections at Camshaft
Position Actuator solenoid
harness connector
35
Conditions for Setting P0014
cont.
5. Poor connections at PCM
6. High resistance in Camshaft
Position Actuator solenoid
circuits
36
Visual Checks
 Loose sensor
 Loose harness connector
 Improperly seated sensor
 Cracked sensor case
 Worn/chafed sensor harness
 Oil leaks at connector
37
Other Mechanical Checks
 Excessive timing chain wear
 Excessive camshaft end play
 Excessive crankshaft end play
 Proper installation of actuator
assembly
38
Summary
 Identified components of the
Camshaft Position Actuator System
 Described operation of the
Camshaft Position Actuator System
 Diagnosed operation of the
Camshaft Position Actuator System
39
Post-test Question 1
Oil flow through the Camshaft
Position solenoid valve is
controlled by the ______.
A) PCM
B) Camshaft Position Actuator
C) Camshaft Position Sensor
D) Reluctor Wheel
40
Post-test Question 2
The 4200 I6 Camshaft Position
Actuator system _______.
A) is located on the intake camshaft
B) is pneumatically operated
C) decreases power and torque
D) eliminates the external EGR
system
41
Post-test Question 3
The 4200 I6 eliminates the need for an
external EGR System by ________.
A) running a passage through the
exhaust manifold and into the
intake manifold
B) drawing the exhaust charge into the
cylinder during valve overlap
C) pumping exhaust into the cylinder
from another cylinder
D) connecting the exhaust manifold to the
intake manifold
42
Post-test Question 4
The Camshaft Position Actuator is
designed to____________.
A) retard exhaust camshaft from 0°
B) advance exhaust camshaft
from 0°
C) retard intake camshaft from 0°
D) advance intake camshaft
from 0°
43
Post-test Question 5
When installing the timing chain, the
Camshaft Position Actuator should
be ______.
A) fully advanced
B) fully retarded
C) in any position
D) halfway between advance
and retard
44
Post-test Question 6
The Camshaft Position Actuator
System will only work above _____.
A) 600 RPM
B) 1200 RPM
C) 2200 RPM
D) 2600 RPM
45
Post-test Question 7
The Camshaft Position Actuator
retards exhaust cam timing up
to _______.
A) 15º
B) 20º
C) 25º
D) 30º
46
Post-test Question 8
Oil flow to the Camshaft Position
Actuator is controlled by the ______.
A) Camshaft Position Actuator
Solenoid valve
B) Reluctor wheel
C) CMP sensor
D) Helical spline
47
Post-test Question 9
When physically checking the
Camshaft Position Actuator
movement, how far should it move?
A) 0-3 mm
B) 5-7 mm
C) 14-15 mm
D) 20-22 mm
48
Post-test Question 10
When performing actuator
service, make sure the Camshaft
Actuator is ______.
A) fully advanced, 0º
B) fully retarded, -25º
C) in the middle, 12º
D) fully retarded, 0º
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Thank you for attending
4200 Camshaft Position
Actuator System
Operation and Diagnosis
Copyright 2003 General Motors Corporation