ATASA 5 Detailed Diagnosis & Sensors · 2019. 2. 18. · CKP CMP P/N KS VSS PCM PROM & RAM ABS...

ATASA 5 th Detailed Diagnosis & Sensors

ATASA 5 TH Study Guide Chapter 26 Pages 764809 Detailed Diagnosis & Sensors 51 Points

Please Read The Summary

1. Many different __________ sensors are involved in the overall driveability of a vehicle.

Input Processing Output


Electronic Engine Control System Block Diagram

HO2S

TPS

ECT

IAT

MAF

MAP

CKP

CMP

P/N

KS

VSS

PCM

ABS

Chassis

SRS HVAC AntiTheft

Body

DLC

MIL


Ignition Spark

EFI

Emission Controls

Cruise

Accessories

Engine Outputs

Inputs

Open Loop Mode Closed Loop Mode Clear Flood Mode

Scan Tool

Sensors

Actuators

LimpIn Mode

HO2S

TPS

ECT

IAT

MAF

MAP

CKP

CMP

P/N

KS

VSS

PCM PROM & RAM

ABS

Chassis

SRS HVAC AntiTheft

Body

DLC

MIL


Ignition Spark

EFI (injectors & IAC)

Emission Controls (6) CAT – AIR – PCV TAC – EVAP – EGR

Cruise

Accessories Instrument Cluster

Engine Outputs

Inputs

Open Loop Mode Closed Loop Mode Clear Flood Mode

Scan Tool

Sensors

Actuators

LimpIn Mode

Upstream (A/F) &

Downstream (CAT)

DTC’s

2. In an OBDII system, monitors set a _______ and the ECM or PCM illuminates the _______.


DLC, MIL DTC, MIL DTC, M&M

3. Diagnosis should begin with a thorough ________________ inspection to eliminate simple things.

Under Body Under Roof Under Hood


4. Even though a DTC is retrieved, there is more than ______ possible cause for most problems.

One Ten Fifty


Conditions to set DTC’s

• Some diagnostic tests (monitors) run continuously

• Some diagnostic tests (monitors) run “Once per trip”

• Enable criteria met

• Diagnostic test is run

– IF results of the test are outside PCM parameters

• Type A DTCs turn on light after 1 failure

• Type B DTCs require 2 consecutive trips w/failure


Only A & B codes will illuminate the MIL

DTCs in 5 Character Format

1 st character – letter (Body PPWR/TRN Chassis Uart) 2 nd character 0generic 1Manufacturer Specific 2Manufacturer Specific

3 rd Character 18 1 Fuel & Air Metering 2 Inj. Circuits 3 Ignition or Misfire 4 Emissions Controls 5 Vehicle Speed control and idle controls 6 Computer Output Circuit 7 & 8 Transmission

1 = Fuel and Air Metering 2 = Fuel and Air Metering (Injector circuits only) 3 = Ignition System or Misfire 4 = Auxiliary Emission Controls 5 = Vehicle Speed Control and Idle Control System 6 = Computer Output Circuit 7 = Transmission 8 = Transmission

The last 2 digits indicate the component or system section that has the fault…

Remember: More Testing Needed! Meter, Scope, Gauges, TSB Check, etc.

5. If OBDII monitors (selftests) have not been run, a __________ may be present but a DTC not set.

Fault Issue Code


Monitor Systems

• Catalytic Converter

• O2 Sensor

• O2 Heater

• EGR

• AIR

• EVAP

Once per TripFlags Continuously MonitoredNo Flags

• Comprehensive Component Monitor

• Misfire (counter & cylinder ID)

• Fuel Trim (STFT & LTFT)

6. ___________ _______ data associated with a DTC should be retrieved and studied.

Freeze Frame Frozen Frame Movie Shot


7. __________ freeze frame (MFF) is not part of regular DTC freeze frame data.

Mineral Misfire Misdiagnosis


MISFIRE MONITORINGCONTINUOUS

8. Mode ___ data shows outofrange values that did not trigger a DTC…very useful in diagnostics!

$01 $02 $06


9. Driveability problems without DTCs require a tech to do _____________ based diagnostics.

Strategy Symptom Complaint


10. Basic DMM and ______ __________ checks can verify sensor as well as actuator activity.


Fuel Pressure Fault Code Lab Scope

11. All sensors perform the same basic functions of detecting __________ conditions, ____________ states or ________________ conditions & change that into electrical signals the PCM understands.

Mechanical, Thermal, Hydraulic Mechanical, Chemical, Pneumatic Mechanical, Chemical


12. On a lab scope, the vertical axis is the __________ scale, the horizontal axis is ________ base or sweep, and the trigger is the signal that tells the scope to start drawing the pattern on the screen.

Voltage, Ohms Voltage, Time Voltage, Frequency


13. A waveform ___________ can be referred to in order to find out what a normal trace looks like.

Library Dictionary Thesaurus


14. Good ___________________ and clean _____________ are key to properly functioning circuits.

Connections, Grounds Connections, Voltages Connections, Sources


15. A ____________ ________ test is a quick way of testing the condition/integrity of any wire.

Ohms Law Voltage Available Voltage Drop


16. EMI is electromagnetic _______________ in a signal due to a poor ground or a positive side issue.

Noise Interference Static


17. Voltage spikes in solenoid circuits are captured by ____________ diodes.

Clamping Stamping Zener


18. The job of ____________ is to do onoff digital signaling.

Sensors Actuators Switches


19. _________________ sensors are NTC thermistors, (ECT, IAT, CHT, TFT) & can be DMM checked.

Pressure Temperature Position


20. ____________ sensors are piezo resistive and can be best checked with a lab scope.


Pressure Temperature Position

21. A ________ pressure sensor is similar in operation to a MAP, it measures EVAP system pressure.

Vapor Fuel Water


22. ______ feedback pressure sensors (DPFE) and fuel rail pressure sensors are also piezoresistive.

CAT EGR PCV


23. The _______ ____________ (MAF) measures the flow of air entering the engine. The MAF is typically a hotwire wheatsone bridge. A very touchy sensor a piece of dust can make it act up.

Mass Air Flow Mass Air Management Mass Air Temperature


24. If you lightly ______ on a MAF with the handle of a screwdriver and it starts to act up, replace it.

Slam Hammer Tap


25. Typical MAF readings at idle are ___ to ___ grams per second of airflow.

1 to 2 4 to 7 10 to 12


26. The ___________ ________ _________ sensor (HO 2 S) is the key sensor in closed loop mode.

Exhaust Gas Oxygen Exhaust Vapor Pressure Exhaust Gas Omission


27. ____________ HO 2 S are used for A/F control.

Upstream Midstream Downstream


28. __________________ HO 2 S are used as a catalyst efficiency monitor.


Upstream Midstream Downstream

29. Oxygen sensors can be narrow range ____________ (ZrO2) or wide range _____________ (TiO2).

Zirconium, Titanium Zippo, Titania Zirconium, Tilapia


30. Zirconium Dioxide & Titanium Dioxide sensor produce voltage the same way. True or False


31. A ZrO 2 HO 2 S can fail be being biased either _______ or _______, may not work at all, or may be slow.

Rich, Lean Rich, Loose Pitch, Lean


32. The upstream HO 2 S should have ____ cross counts over & under the .450 volts every 5 seconds.

3 7 10


33. The ____________ position sensor is a 5volt reference potentiometer.

Throttle Manifold Tumble


34. Electronic throttle control will have 2 ______ and 2 accelerator position sensors.

MAF MAP TPS


35. Watch a TPS with a ______ __________ for an even sweep without drop offs (breaks) or spikes.

Multimeter Lab Scope Noid Light


36. ___________ speed sensors are magnetic __________ generators. (aka: variable reluctance sensors)

Vehicle, Pulse Transmission, Pulse Crankshaft, Telsa


37. _______ effect sensors can be used a crankshaft position (CKP) & camshaft position sensors(CMP).

Stall Hall Crawl


38. Using a ________ trace lab scope, CKP and CMP can be checked for their synchronization.

Dual Triple Quad


39. A _________ sensor (KS) is a piezogenerator that generates a voltage when vibration is applied.

Kinikinic Knock Knack


40. Generally speaking, ______________ are electromechanical devices that convert an electrical current into a mechanical action. Actuators are typically solenoids, motors, or lights.

Actuators Sensors Inputs


Outputs controlled by the PCM include devices such as: – Solenoids – Relays – Motors – Lights – Diagnostics (DTCs)

These components control the operation of systems

such as: A/C Compressor Clutch / AIR / Cooling Fan /Cruise Control / Diagnostics (DTCs) / MIL / Engine Torque Mgmt / EVAP / Fuel Pump / EGR / Fuel Injector(s) / Idle Air Control (IAC) / Ignition Control (IC) / Intake Manifold Tuning / Shift Light / Throttle Control / Transmission Converter Clutch (TCC) / Transmission Pressure Control / and Transmission Shift

41. Actuators can be tested with lab scopes for their __________ width, signal _____________, and voltage waveforms (signatures).

Performance, Frequency Sweep, Amplitude Pulse, Frequency


42. Following repairs, a system should be checked to __________ operation. A test drive should be done to take the vehicle through a drive cycle that will complete the OBD II diagnostic monitors.

Quantify Verify Mummify


ATASA 5 Detailed Diagnosis & Sensors · 2019. 2. 18. · CKP CMP P/N KS VSS PCM PROM & RAM ABS...

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