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Scan Tool Functional Tests Scan Tool Functional Tests Steve Zack, Jim Wilson, Ross Hayner.

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Presentation on theme: "Scan Tool Functional Tests Scan Tool Functional Tests Steve Zack, Jim Wilson, Ross Hayner."— Presentation transcript:

1 Scan Tool Functional Tests Scan Tool Functional Tests Steve Zack, Jim Wilson, Ross Hayner

2 Fuel Control Test

3 DataStream Diagnostics Fuel Control Test Clear Flood Equipped Vehicles A) DataStream TPS Injector Pulse Width B) KOEO C) WOT TPS 4.3 To 4.7 Volts Injector Pulse Width 0.0

4 Scan Tool Fuel Control Test (Easy to get HO2S) 1) Disconnect HO2S 2) Datastream –HO2S –Injector Pulse Width 3) Volt Meter At HO2S Signal Return Wire at O2 sensor 4) KOER, Engine At Operating Temperature, 1000 Rpm 5) Place One Finger On PCM HO2S Signal Return Wire to the PCM 6) Place Another Finger At Battery Positive –Datastream HO2S - 1 Volt –Datastream Injector Pulse Width - Will Drop –Volt Meter HO2S - 0 Volt 7) Place Finger At Battery Negative –Datastream HO2S - 0 Volt –Datastream Injector Pulse Width - Will Rise –Volt Meter HO2S - 1 Volt

5 Scan Tool Fuel Control Test (Hard to get HO2S) 1) Datastream –HO2S –Injector Pulse Width 2) Propane enriching device 3) KOER, Engine At Operating Temperature, 1000 Rpm 4) Open propane bottle –Datastream HO2S - 1 Volt –Datastream Injector Pulse Width - Will Drop 5) Close propane bottle –Datastream HO2S - 0 Volt –Datastream Injector Pulse Width - Will Rise

6 Lambda Fuel Trim Tests

7 Fuel Trim/Lambda Graph STFT Graph LTFT Add together to get the actual Fuel Trim Compare to the LAMBDA Reading on the GAS Analyzer If readings are 1.0 on LAMBDA and near O% Actual Fuel Trim the vehicle is running correctly

8 LAMBDA/Fuel Trim LAMBDA at 1.04 slightly lean readings LTFT -3.9% both banks STFT 0% both Banks Actual Fuel Trim Correction -3.9%

9 LAMBDA/Power Enrichment Snap the Throttle WOT, TPS is 4.47V Power Enrichment is Active It takes time for the gases to flow through the Gas Bench LAMBDA is at.96 at the red arrow showing power enrichment

10 Ford Fuel Pressure Tests

11 Ford Electronic Return-less Fuel System Fuel Rail Pressure Sensor measures pressure difference between fuel rail and the intake manifold Fuel Pump Duty Cycle –This reading is half the fuel pump driven duty cycle

12 O2 Sensor Tests

13 02 Sensor Testing 2004 Pathfinder Software –Custom Display 7 Samples per Second –Highlight, Select and Graph HO2S Bank 1 Sensor 1 Perform for each front fuel trim O2 sensor –Specification for Good O2 Sensor: 10 cycle from 200mv Lean to 800mv Rich and then Rich to Lean in 1 second, at 2000 RPM hot engine 149 frames divided by 7 samples second equals O2 Sensor cycles from 200mv Lean to 800mv Rich and then Rich to Lean, at 2000 RPM hot engine

14 O2 Sensor Propane Test Propane enrichment testing to check that the O2 sensors are working properly Select, graph and zoom the O2 sensors Propane enrichment increases the O2 output above.91 volts, preferred is closer to 1.0 volt. Keep adding propane until RPM decreases, to get the maximum output Remove the propane to see how fast the voltage decreases. It should decrease in a straight line HO2S S2 did not and should be replaced Bad O2 Good O2

15 Bi-directional Tests

16 Bi-Directional Test (Example Injector Control) (Use to verify possible misfire) 1) KOER 2) Setup datastream to read –Injector Pulse Width –HO2S –RPM 3) With scan tool control injector –Injector off pulse width should drop –RPM should drop –HO2S should drop

17 Bi-directional Functional Test 1) Turn Device Normally Off To On 2) Device Activated –A) Ok Electrically 1) Problem May Be Mechanical 3) Device Does Not Activate –A) Test B+ At Device 1) Ok, Go To Step B) 2) Bad, Repair B+ Circuit –B) Test B- At Device 1) Ok, Replace Device

18 Injector Testing

19 Chrysler Bi-Directional Testing Special Test –Install Fuel Pressure –ATM - Automatic Test Mode Injector Press Activate soft key –Fuel Pressure should drop »20% is the max variable from injector to injector

20 EVAP Testing

21 GM EVAP Test Remove fuel cap and verify tank pressure voltage should be 1.3 to 1.7 or 0 inH2O Using vent solenoid bi-directional test block venting operation Apply vacuum to system using engine vacuum or an external vacuum source Obtain 5 of vacuum using tank pressure sensor reading Pinch off vacuum source and seal system Monitor fuel tank pressure for 5 minutes in graph mode (Connectech preferred for longer record times) If decay is present save recorded time and decay info. Apply smoke to pinpoint leak or apply very light pressure to system Use HC on a 5 gas analyzer to pinpoint leak. Repair and retest decay of system and compare to previous recording System Performance test is also available if certain conditions are met

22 Ford EVAP Test Key ON Engine Off Remove the connector from the Vacuum Management Valve Use the Special Menu then go to Output Controls and select All Outputs on Use the EVAP Test Port and perform the pressure test with the EVAP Tester

23 Air Pump Testing

24 Electric Air Pump Test Scroll to Special Tests, press Enter Scroll to Engine Controls, press Enter Scroll to Air Pump, press Enter Press More and scroll to Select, press Enter Scroll to HO2S Data, press Enter Scroll and high light HO2S Bank 1 & 2 Sensors 1& 2 Press More, scroll To Top, press Enter for each HO2S sensor Press Start then On to activate Air Pump Front O2 sensors should switch below 200mv and remain there until Air Pump is deactivated.

25 EGR Testing

26 EGR Functional Test (Bi-directional) 1) Engine At Operating Temperature, KOER 2) Scan Tool Datastream –EGR Percentage –Injector Pulse Width –HO2S –MAP voltage –RPM 3) With scan tool open EGR valve 6) Datastream –EGR Percentage, High –Injector Pulse Width, Drop –HO2S increase –MAP voltage should rise –RPM should drop

27 EGR Bi-Directional Test GM Linear EGR Scroll to Special Tests and press Enter Scroll to EVAP/EGR and press Enter Press More and scroll to Select Press Enter and scroll to EGR Data Press Enter Scroll and high light EGR Normalized Position Data Press Start and Increase EGR percentage EGR Commanded opening should be within 3% of actual Normalized Position

28 EGR Functional Test (Non-Bi-directional) 1) Engine At Operating Temperature, KOER 2) Scan Tool Datastream –EGR Percentage –Injector Pulse Width –HO2S 3) Vacuum Gauge At EGR Valve Vacuum Hose 4) Lab Scope On EGR Solenoid 5) Bring Engine RPM To 2000 Loaded 6) Datastream –EGR Percentage, High –Injector Pulse Width, Drop –HO2S increase 7) EGR Vacuum, 3 Inches Or Higher 8) EGR Solenoid, Lab Scope, Pulse To Ground

29 EGR Functional Test (FORD KOER) 1) Engine At Operating Temperature, KOER 2) Vacuum Gauge At EGR Valve Vacuum Hose 3) Lab Scope On EGR Solenoid 4) Perform KOER Test 5) EGR Vacuum, 3 Inches Or Higher, Vacuum OK, Solenoid OK 6) EGR Solenoid, Lab Scope, Pulses To Ground, Duty Cycle, Solenoid OK 7) Inspect EGR Passage For Carbon This Test Can Be Performed On Any FORD Actuating Device, i.e. Injector, Idle Air Control, And EGR

30 FORD EGR Quick Test FORD quick EGR test –Plug the EVR which is normally open The port is under the cap on the EVR near the filter assembly Port plugged RPM should drop as EGR opens RPM does not drop, clean the EGR passages

31 FORD DPFE Run the engine at idle and graph the EGR Delta Pressure Feedback Sensor Apply About 6 inches of Vacuum to the EGR The output should go above 4.0 volts

32 Timing Advance Tests

33 GM CAM Retard Tests GM CAM RETARD or CAM OFFSET PID Spec is 0 degrees +/- 2 degrees for V8 engines At hot idle monitor PID Raise RPM to 1000 RPM after adjusting distributor to force computer to recalculate CAM Retard PID Repeat steps until pid indicates 0 degrees

34 Timing Advance Datastream Test Datastream review of Timing Advance versus RPM The timing advance should follow RPM, except when in Wide Open Throttle, when timing advance decrease slightly

35 Datastream review of Timing Advance versus TPS TPS moves and Spark changes good reaction and timing curve Timing Advance Datastream Test

36 Datastream review of Timing Advance versus MAP The spark advance must follow the MAP sensor load changes Timing Advance Datastream Test

37 Secondary Ignition Tests

38 Chrysler Bi-Directional Testing Special Test –Install Secondary Ignition Tester –ATM - Automatic Test Mode Ignition Coil Press Activate soft key –Secondary Voltage should read 4K to 7K

39 MAF Sensor Tests

40 MAF Test 1) KOER, Engine At Operating Temperature 2) Scan Tool Datastream –MAF GPS (Frequency May Be Substituted For GPS) 3) Mark Points Of MAF GPS On Graph Paper –1000 Rpm –1250 Rpm –1500 Rpm –1750 Rpm –2000 Rpm 4) Connect Plot Points, Graph Line Should Rise Smooth

41 Good MAF Graph GPS RPM

42 Bad MAF Graph - Out of Calibration GPS RPM

43 Bad MAF Graph - Air Leak GPS RPM

44 MAF Test Select and graph RPM and MAF Ford MAF sensor should reach a output of above 3.5 volts with a snap throttle This sensor did not reach the output and needed to be cleaned or replaced

45 GM MAF TEST GM with a snap throttle should go above the 5.4 kHz for a good sensor output Check MAF sensing wires or clean the wires, and check the duct work for leaks after the MAF sensor

46 MAP Sensor Tests

47 MAP Sensor Test 1) Scan Tool Datastream –Map Sensor Voltage 2) KOEO 3) Attach Vacuum Pump To Map Sensor Vacuum Port 4) 0 Vacuum, 3.9 To 4.7 Volts 5) 18 To 20 Inches Vacuum,.8 To 1.5 Volts

48 Cranking Vacuum/Pressure Cranking Vacuum can be tested using the MAP Sensor The voltage or pressure should decrease in response to vacuum

49 Reaction Testing Testing the TPS against the MAP sensor shows the response of the sensors They should follow each other. This test will verify CAM to Crankshaft timing This test will verify if the TPS sticks when closing MAP shows a good response to change and shows the engine is breathing correctly

50 TP Sensor Tests

51 TPS Sweep Test 1) KOEO 2) Scan Tool Datastream –TPS 3) Open And Close TPS, Smooth Linear Rise

52 Two Wire Sensor Tests

53 Two Wire Sensor Testing Check for Voltage supply –Voltage supply must be above 4.6 volts Scan tool should read cold –40°F Short the pins in the connector together –Reading on DVOM should be less than.050 mv Scan tool reading should be above 260°F

54 Three Wire Sensor Tests

55 Three Wire Testing Check for Voltage Reference –Range 4.9 to 5.1 volts Check for proper ground –Red lead at sensor ground and black lead at battery ground, voltage should read under.050mv Short VREF pin and Signal pin together –Datastream should read the same as VREF Short signal pin and ground pin together –Datastream should read zero

56 Cylinder Misfire Tests

57 Cylinder Misfire Testing Engine at operating temperature Vehicle at cruise speed Monitor rear or post HO2S –Base line voltage.430mv to.470mv Rear HO2S voltage high –Secondary Ignition miss fire Rear HO2S voltage low –Lean Injector miss fire

58 Catalyst Efficiency Tests

59 Catalyst Test 1 1) Engine at Operating Temperature 2) All Basic Engine Functions Must Be in Good Working Order 3) Raise Engine Rpm to 2000 and Hold Steady 4) 3 Minutes Minimum 5) Monitor HO2S Sensors Upstream and Downstream 6) Upstream Should Be Swinging Rich to Lean 7) Downstream Should Be Steady With Small Swing of 430 to 470 Mv

60 Catalyst Test 2 To test for a plugged Catalytic Converter, highlight and graph MAP Voltage With the engine running at 2000 RPM for 3 minutes note what MAP Voltage is, it should be around 1.2 to 1.6 Volts Snap the throttle to wide open from 2000 RPM MAP Voltage will rise from 2000 RPM at wide open throttle to approximately 3.8 to 4.2 Volts When the engine returns to idle MAP Voltage should return to 1.2 to 1.6 Volts in less than 3 seconds If it takes longer than 3 seconds the Catalytic Converter maybe plugged Snap Closed

61 Charging Systems Tests

62 Charging Systems Test 1) KOER 2) At Idle verify Battery Volts 3) At 2000 RPM verify Battery Volts –Turn all accessories on Voltage should rise to 14 to 15 volts

63 Cranking Voltage Test Record the voltage Put the engine in Clear Flood mode Crank the engine for 15 seconds Cranking Voltage should not go under 9.6 Recovery Voltage should come close to the recorded voltage in less than 7 seconds

64 Final Step

65 Test Completion Many of the tests performed may set DTC –Check Diagnostic Trouble Codes Clear DTCs after diagnostics are completed


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