Brake Bleeding Lab



AT 261 - Chapter 12c Sensors and Inputs (part 2)

Name: _________________________________________

Date: __________________________________________

1996 Ford Thunderbird 4.6L (Station 1) – Use Mitchell’s SENSOR RANGE CHARTS under ENGINE PERFORMANCE

Locate the following components and show them to your instructor:

IAT

ECT

TP

MAF

1. At 14 deg F the resistance of the IAT should be __________________ ohms, and the processor should see _________________ volts.

2. At 194 deg F the resistance of the ECT should be __________________ ohms, and the processor should see _________________ volts.

3. With a throttle angle of 0% (closed) the TP should send back _____________ volts to the PCM.

4. With a throttle angle of 100% (WOT) the TP should send back _____________ volts to the PCM.

5. With a throttle angle of 25% (Cruise) the TP should send back _____________ volts to the PCM.

6. If the MAF sensor is at idle it should send back ________________ volts to the PCM.

7. If the MAF sensor is at 60 MPH it should send back ________________ volts to the PCM.

8. Is this a Speed Density or Mass Air Flow air calculation design? ________________________

1997 Acura 2.2 CL (Station 2) Use Mitchell’s SENSOR RANGE CHARTS under ENGINE PERFORMANCE

Locate the following components and show them to your instructor:

IAT

ECT

TP

MAP

9. At 32 deg F the resistance of the IAT should be __________________ ohms, and the processor should see _________________ volts (You can use your L1 guide)

10. At 176 deg F the resistance of the ECT should be __________________ ohms, and the processor should see _________________ volts. (You can use your L1 guide)

11. With a throttle angle of 0% (closed) the TP should send back _____________ volts to the PCM.

12. With a throttle angle of 100% (WOT) the TP should send back _____________ volts to the PCM.

13. With a throttle angle of 50% (1/2 open) the TP should send back _____________ volts to the PCM.

14. If the MAP sensor is at idle it should send back ________________ volts to the PCM.

15. If the MAP sensor is at WOT it should send back ________________ volts to the PCM.

Note: Honda MAP sensors do not range from 0-5 volts – they range from 0-3 volts

16. Is this a Speed Density or Mass Air Flow air calculation design? ________________________

2001 Ford Windstar 3.8L (Station 3) Use Mitchell’s SENSOR RANGE CHARTS under ENGINE PERFORMANCE

Locate the following components and show them to your instructor:

IAT

ECT

TP

MAF

17. At 50 deg F the resistance of the IAT should be __________________ ohms, and the processor should see _________________ volts.

18. At 248 deg F the resistance of the ECT should be __________________ ohms, and the processor should see _________________ volts.

19. With a throttle angle of 0% (closed) the TP should send back _____________ volts to the PCM. (Use Job Aid)

20. With a throttle angle of 100% (WOT) the TP should send back _____________ volts to the PCM. (Use Job Aid)

21. With a throttle angle of 30% (Cruise) the TP should send back _____________ volts to the PCM. (Use Job Aid)

22. Is this a Speed Density or Mass Air Flow air calculation design? ________________________

Diagnosing Codes from a Scan Tool (Station 4)

Tools you will need:

Mitchell's on Demand

( Using Mitchell's on Demand Look up a 1999 Acura 3.5 RL.

( Go to engine performance.

( Go to the section "self-diagnostics”

( Go to the sub-section "diagnostic tests”

( Go down to the sub-title of “DTC P0112"

( What sensor is related to this code? ________________________

( What is the full title of this code? ___DTC P0112 - _____________________________________________

( At step 1, if air intake temperature is 302 deg F or more, what step do you jump to? __________________

( If at step 1 the air temp is less than 302 deg F, what step do you move to? _____________________

( If at step 2 you currently have a reading from the sensor, what does this mean, and what other items could be at fault? _________________________________________________________________________________

( What does step 3 have you do to the sensor? _____________________________

( At step 3, if the sensor shows 302 deg F or more, what do you do next? _____________________________

( At step 3, if the sensor shows less than 302 deg F, what do you do next? _____________________________

( At step 4, if there is a short in the Red/Yellow wire, what must you do? ______________________

( At step 4, if there is a NO short in the Red/Yellow wire, what must you do?

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Measuring Sensors (Station 5)

Tools you will need:

2001 Ford Windstar (Red) – 1996 Ford Thunderbird

Sensor Range Chart - (Use Job Aid)

Engine Performance Schematic - (Use Job Aid)

DVOM, Back probe Pins

( Locate the TP sensor

( What are the wire colors/codes for the TP sensor? _____________________________________

( Which wire is the sensor ground (signal return)? __________________________

( What is the pin number back to the PCM (signal return)? ____________________________

( Which wire is the 5v-sensor reference (vref) line? __________________________

( What is the pin number back to the PCM (5v vref wire)? _________________________

( Which wire is the signal (TP) to the PCM? _______________________________

( What is the pin number back to the PCM (signal TP)? _______________________________

( Disconnect the TP sensor from its harness back to the PCM, set the DVOM to read Ohms.

( Measure the resistance of the sensor between the 5V-reference pin (vref) , and the sensor ground.

( What is the resistance? _____________________________

Note: This is the sensors total resistance – DO NOT read the resistance of the harness!

( Next measure the resistance between the 5V-reference pin (vref) and the signal (TP)

( What is the resistance? _____________________________

( Open the throttle to WOT

( What is the resistance? _____________________________

( Slowly move the TP sensor back and fourth between WOT and Idle, note the resistance for "jumps" or "glitches"

( Was the reading smooth as the TP sensor was moved back and fourth? ___________________________

Note: If the reading was not smooth, the sensor would be faulty, and may cause a derivability problem, MIL to activate, and "Set a code" for the TP sensor.

( Reconnect the TP sensor to the harness. Set the DVOM to read Volts DC.

( Turn on the ignition key, DO NOT start the vehicle.

( Measure the voltage of the sensor between the signal ground , and the signal return (TP)

( What is the voltage? _____________________________

( Open the throttle to WOT

( What is the voltage? _____________________________

( Slowly move the TP sensor back and fourth between WOT and Idle, note the voltage for "jumps" or "glitches"

( Was the reading smooth as the TP sensor was moved back and fourth? ___________________________

( Are the readings consistent with the sensor range chart? ___________________________

( Is this TP sensor functioning correctly? ___________________________

( Locate the ECT sensor

( What are the wire colors/codes for the ECT sensor? _____________________________________

( Which wire is the 5v-sensor reference line? __________________________

( What is the pin number back to the PCM (5v ref)? _______________________________

( Which wire is the signal return to the PCM? _______________________________

( What is the pin number back to the PCM (signal wire)? _______________________________

( Disconnect the ECT sensor from its harness back to the PCM, set the DVOM to read Ohms.

( Measure the resistance of the sensor between the 5V-reference pin, and the sensor ground.

( What is the resistance? _____________________________

Note: Check the sensor against the sensor range chart

( Reconnect the ECT sensor to the harness. Set the DVOM to read Volts DC.

( Turn on the ignition key, DO NOT start the vehicle.

( Measure the voltage of the sensor between the 5V-reference pin, and the signal return.

( What is the voltage? _____________________________

( Are the readings consistent with the sensor range chart? ___________________________

( Is this ECT sensor functioning correctly? ___________________________

What should happen to the voltage as the temperature goes higher? _________________

What should happen to the resistance as the temperature goes higher? _________________

What should happen to the voltage as the temperature goes colder? _________________

What should happen to the resistance as the temperature goes colder? _________________

Note: there are two ways to test the sensor, a simple resistance test, or a function voltage drop test. Most techs prefer the functional voltage drop test as it "forces" the sensor to work with voltage.

( Remove the DVOM, and disconnect the vehicle battery.

Using a Scan Tool (Station 6)

Tools you will need:

OTC Genisys Scan Tool

( Attach the power cord to the scan tool.

( Turn on the scan tool, and wait for it to boot-up

( At the main menu, what are your options?

_____________________________________________________________________________________________

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( Select "Pathfinder 2000" by pressing the "ENTER" key.

Note! IF at any time, you make a mistake, press the "EXIT" button to return to the previous set of options.

( At the menu, what are your options?

_____________________________________________________________________________________________

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( Select "GM" by pressing the enter key.

( What are you options now?

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( Select "2000" by pressing enter.

( What are your options now.

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( Select "Chevrolet" by pressing enter.

( What are your options now.

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( Select "Car" by pressing enter.

( What are your options now.

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( Select "Corvette" by pressing enter.

( What are your options now.

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( Select "Engine/PCM" by pressing enter.

( What are your options now.

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( Select "Manual" by pressing enter.

( What cable does the scan tool tell you to use for this vehicle?

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( Press Enter

( What cable does the scan tool tell you to use for this vehicle? –

Note: All vehicles sold in North America made after 1996 use this cable.

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( Exit back to the main screen and this time select the following vehicle.

1994 Ford Mustang, GT Coupe – 5.0 Automatic Trans.

( What cable does the scan tool tell you to use for this vehicle?

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1992 Jeep Wrangler – 2.5L

( What cable does the scan tool tell you to use for this vehicle?

__________________________________________________________________________________

1993 Plymouth Dynasty 3.3L

( What cable does the scan tool tell you to use for this vehicle?

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Job Aid for Windstar/Thunderbird Lab (Stations 3 and 5)

Job Aid for Windstar/T-Bird Lab (Station 3 and 5)

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