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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

54.2L L6 (LL8) “Vortec 4200”

Engine Speed (X 100)

Ho

rse

po

we

r

To

rqu

e (

lb-f

t)

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

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

External EGR:

9

Internal EGR:

Exhaust charge drawn back

into cylinder during valve

overlap

Exhaust Gas Recirculation cont.

10

Cam

Actuator

Engine RPM

ManifoldPressure(MAP)

Cam ActuatorSolenoid

VentSupply

Vent

Front of Piston

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 3Which 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 PositionActuator

CMPSensor

Camshaft Position ActuatorSolenoid

17PCM Location

PCM

18

Actuator CutawayActuatorPiston

HelicalSpline

Hub

19

Reluctor Wheel

CMP

CamshaftActuator

20

Camshaft Position Actuator Solenoid Valve

21

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%

23

Camshaft Position Sensor

CMP

CamshaftActuator

24

Oil Flow Diagram

25

Camshaft Position

Actuator Purpose

Internal EGR

Fuel economy improvement

Emissions improvement

26

Operation

Operational range

– 25º of exhaust cam timing retard

Camshaft Position Actuator onlyoperates

– 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

27

Timing

Chain

28

Timing

Chain

Close-Up

29

Timing

Chain

30

Module 4 Objective

Diagnose operation of

4200 Camshaft Position

Actuator System

31

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 ActuatorSolenoid Valve

– remove power steering pumpfirst

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 1Oil 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 2The 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 theexhaust manifold and into theintake manifold

B) drawing the exhaust charge into thecylinder during valve overlap

C) pumping exhaust into the cylinderfrom another cylinder

D) connecting the exhaust manifold to the intake manifold

42

Post-test Question 4The 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 5When 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

49

Thank you for attending

4200 Camshaft Position Actuator System

Operation and Diagnosis

Copyright 2003 General Motors Corporation