1. Copyright © 2008 General Motors Corporation.
All Rights Reserved.

2. Camshaft Position Actuator Systems & Active Fuel Management
Welcome to
Camshaft Position Actuator Systems & Active Fuel Management
Course # D

3. The material contained in this course component was accurate and current at the time of course development

4. Web Site

5. Question 1
In which of the following regions is your dealership located?
Atlanta
Chicago
Dallas
Los Angeles
New York

6. Course Goal
Upon successful completion of this course, you will be able to identify and describe the new features, service procedures, and diagnostics associated with:
Camshaft Position Actuator Systems
Active Fuel Management

7. Session Objectives Identify and describe two unique engine features:
Camshaft Position Actuator Systems
Active Fuel Management

8. Module 1 Objective
Identify and describe the operation and diagnosis of the Camshaft Position Actuator Systems used on General Motors engines.

9. Camshaft Position Actuator System Benefits
Increased horsepower and torque
Improved gas mileage
Improved emissions
Eliminates external emission systems (EGR, AIR)

10. Camshaft Position Actuator System Operation
Varies exhaust valve timing
Maximum 25 cam retard on exhaust camshaft

11. Component Illustration
Actuator
Solenoid
Sensor

12. Operation Overview Exercise
Exhaust cam timing retard range is ___ cam degrees (50 crank degrees).
Camshaft Position Actuator operates above approximately _____ rpm. 25
1200

13. Operation Overview Exercise cont.
Intake charge is diluted with exhaust gas in combustion chamber similar to what ____ system does.
Amount of intake charge dilution determined by the ____.
EGR
PCM

14. Question
How does exhaust cam phasing achieve EGR?
Call in Now

15. Camshaft Position Actuator System

16. 3.6L Camshaft Position Actuator System Components
4 Camshaft Position Sensors
4 Camshaft Position Actuators (Vane type)
4 Camshaft Position Actuator Oil Control Solenoids

17. Fill-in-the-Blanks
The camshaft actuators allow ______ and ________ camshaft adjustments through ___ ________ of crankshaft rotation (25 degrees of cam rotation).
This 4-cam phasing system is ____________ controlled and ____________ actuated.
intake
exhaust 50
degrees
electronically
hydraulically

18. Fill-in-the-Blanks cont.
Four _________ camshaft position actuators provide faster response time and a more compact and lightweight design than ____________ actuator assemblies.
________________ in combination with a high pressure _______________ are used to actuate the control valves.
vane type
helical spline
Electromagnetics
oil supply circuit

19. Fill-in-the-Blanks cont.
Camshaft phasing is continuously variable within a range of __ crank degrees for the intake camshafts and __ crank degrees for the exhaust camshafts (20 and 25 cam degrees respectively).
Four ________________________, one for each camshaft are featured. 40 50
Camshaft Position Sensors

20. Question 2
Which of the following advantages are provided by the Camshaft Position Actuator System?
The ability to eliminate the AIR emission system
The ability to eliminate the EGR emission system
Both A and B
Neither A nor B

21. Question
Why does the Camshaft Position Actuator System allow some emission systems to be eliminated?
Call in Now

24. Electrical DTCs P0010, P0013, P0020, P0023, P2089, P2091, P2093, P2095
Intake or exhaust camshaft position actuator solenoid control circuit bank 1 or bank 2 (electrical)
ECM detects that the control circuit voltage is out of range (open or short)

25. Mechanical DTCs
P0011, P0014, P0021, P0024
Intake or exhaust camshaft position system performance - bank 1 or bank 2
ECM detects that the desired and actual camshaft position angles are not within the calibrated value

26. Correlation DTCs
P0016, P0017, P0018, P0019
Crankshaft position (CKP) – Camshaft position (CMP) correlation
ECM detects a deviation between camshaft position target and crankshaft position

27. Correlation DTCs cont. P0008, P0009
Engine position system performance: bank 1 (P0008) or bank 2 (P0009)
ECM detects that both camshafts on a bank of the engine are misaligned with the crankshaft for more than four seconds

28. Posttest Question 1 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
Technician A says the Camshaft Position Actuator System on the HFV-6 engine provides timing retard functions only. Technician B says the Camshaft Position Actuator system provides phasing for the intake cams only. Which technician is correct?
Technician A
Technician B
Both Technician A and B
Neither Technician A nor B

29. Posttest Question 2 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
The Camshaft Position Actuator system on the 4.6L LH2 Northstar engine is ________________ controlled and ________________ actuated.
electronically; mechanically
mechanically; electronically
hydraulically; electronically
electronically; hydraulically

30. Posttest Question 3 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
The Camshaft Position Actuator system on the 4.2L Line engine provides continuously variable phasing of the ______________.
intake camshafts
exhaust camshafts
intake AND exhaust camshafts
crankshaft

31. Posttest Question 4 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
On the 4.6L LH2 Northstar, Camshaft Position Sensors are mounted ____________.
one per camshaft
two per camshaft
one for each set of intake and exhaust camshafts
one for the entire engine

32. Posttest Question 5 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
The Camshaft Position Actuators on the 4.6L LH2 Northstar engine are of a ___________ design.
gear
helical spline
vane type
belt

33. Module 2 Objective
Identify the components, operation, and diagnostics of the Active Fuel Management system.

34. Question 3
Proper AFM operation is designed to operate in __________ mode.
V-4
V-5
V-6
V-7

35. Pressure Relief Valve

36. Fill-in-the-Blanks
The AFM lifters have several components consisting of ___________, an __________, a ___________, and the ________________.
locking pins
outer body
pin housing
valve lifter spring

37. 5.3L AFM Engine Block

38. E40 ECM

39. Brake Booster Vacuum Sensor

40. AFM Enable Criteria Transmission in 3rd or 4th gear
Oil pressure between psi
Engine speed between rpm
Engine oil temperature between °C (68-302°F)
System voltage between volts

41. AFM Disable Criteria Engine manifold vacuum low
Brake booster vacuum pressure low
Accelerator pedal position rate of increase too high
Accelerator pedal position too high
Ignition voltage out of range

42. AFM Disable Criteria cont.
Manifold Absolute Pressure Sensor
Brake Booster Vacuum Sensor
Engine Oil Pressure Sensor
Engine Coolant Temperature Sensor
Crankshaft Position Sensor
Active Fuel Management Solenoid Driver Circuits

43. Question 4
If the ECM is commanding AFM operation and cylinder #5 is firing, which AFM cylinder will be deactivated first? 2 6 5 4

44. Tech 2 AFM Deactivation Data

45. More Tech 2 Data

46. Tech 2 AFM Special Functions

47. AFM System Diagnosis Check engine oil level
Use scan tool to check for diagnostic codes within the ECM
Verify proper oil pressure and the regulator valve operation – Oil pressure diagnosis and testing
Verify proper operation of the AFM system components – AFM system compression test

48. AFM System Diagnosis cont.
Remove the valve lifter oil manifold
Verify proper operation of the valve lifter oil manifold
Replace AFM valve lifters as required components

49. Oil Gauges

50. Question
What is the concern if the upper gauge has a reading higher than 75 psi?
Call in Now

51. Question
What could be a perceived AFM customer concern?
Call in Now

53. Posttest Question 6 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
When AFM is activated, which of the following cylinders are deactivated on the Gen IV engine?
1, 4, 6, & 7
1, 2, 3 & 4
1, 3, 5, & 7
2, 4, 6, & 8

54. Posttest Question 7 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
During AFM operation, the spark plug for the deactivated cylinder keeps firing to prevent which of the following concerns?
Plugging the fuel injector
Damaging the catalytic converter
Damaging the ignition coil
Fouling the spark plug

55. Posttest Question 8 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
The AFM pressure relief valve is designed to limit oil pressure between _________ psi.
5 - 25

56. Posttest Question 9 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
On Gen IV engines, the AFM VLOM assembly consists of four ______________.
normally open solenoids
normally closed solenoids
pressure sensors
vacuum sensors

57. Posttest Question 10 10 9 11 12 14 13 8 6 1 2 3 5 4 7 15 26 25 27 28 30 29 16 24 18 17 23 19 20 22 21
On Gen IV engines, the resistance specification for the AFM VLOM assembly solenoids is between ___________ and ___________ ohms.
41, 48
31, 38
21, 28
11, 18

58. To Obtain Posttest Results
After 5 Business Days go to:
Select “Training Records” from menu
Select “View Your Training Records”

59. Session Summary
We have identified and described the new features, service procedures and diagnostics associated with the following engine features:
Camshaft Position Actuator Systems
Active Fuel Management

60. Camshaft Position Actuator Systems & Active Fuel Management
Thank you for attending
Camshaft Position Actuator Systems & Active Fuel Management
Course # D

61. Copyright © 2008 General Motors Corporation.
All Rights Reserved.