Copyright © 2008 General Motors Corporation. All Rights Reserved.

Camshaft Position Actuator Systems & Active Fuel Management Welcome to Camshaft Position Actuator Systems & Active Fuel Management Course #16050.11D

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

Web Site www.gmtraining.com

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

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

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

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

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

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

Component Illustration Actuator Solenoid Sensor

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

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

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

Camshaft Position Actuator System

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

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

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

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

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

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

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)

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

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

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

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

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

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

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

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

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

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

Pressure Relief Valve

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

5.3L AFM Engine Block

E40 ECM

Brake Booster Vacuum Sensor

AFM Enable Criteria Transmission in 3rd or 4th gear Oil pressure between 25-75 psi Engine speed between 900-3000 rpm Engine oil temperature between 20-150°C (68-302°F) System voltage between 11-18 volts

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

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

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

Tech 2 AFM Deactivation Data

More Tech 2 Data

Tech 2 AFM Special Functions

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

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

Oil Gauges

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

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

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

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

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 25 - 45 50 - 75 75 - 95

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

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

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

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

Camshaft Position Actuator Systems & Active Fuel Management Thank you for attending Camshaft Position Actuator Systems & Active Fuel Management Course #16050.11D

Copyright © 2008 General Motors Corporation. All Rights Reserved.