Questions and Answers
PCM hasn’t specified the exact ______.
cylinder
The Check Engine Light may ______.
flash
The engine may be hard to ______.
start
One of the possible causes of the problem is a ______ or worn out spark plugs.
Signup and view all the answers
Using a scan tool, pull codes and see if there are any other besides ______.
Signup and view all the answers
Inspect whether spark plugs and their wires are in good ______.
Signup and view all the answers
One of the possible causes of the problem is a ______ catalytic converter.
Signup and view all the answers
The meaning of P0301 is that the PCM has detected that cylinder #1 is not firing ______.
Signup and view all the answers
One of the diagnostic steps is to inspect whether there are loose, open or short ______ in ignition coils.
Signup and view all the answers
Using a scan tool, pull codes and see if there are any other besides ______.
Signup and view all the answers
Study Notes
OBD-II Diagnostic Tools
- PC-based OBD analysis tools convert OBD-II signals to serial data (USB or serial port) standard for PCs or Macs
- Software decodes received data to a visual display
- Popular interfaces are based on ELM or STN1110 OBD Interpreter ICs, which read all five generic OBD-II protocols
- Some adapters use the J2534 API, allowing access to OBD-II protocols for both cars and trucks
PC-Based Tools vs. Hand-Held Scan Tools
- PC-based tools generally offer:
- Large storage capacity for data logging and other functions
- Higher resolution screen than handheld tools
- Ability to use multiple software programs, adding flexibility
- Identification and clearance of fault codes
- Data shown by intuitive graphs and charts
Data Loggers
- Designed to capture vehicle data while the vehicle is in normal operation, for later analysis
- Data logging uses include:
- Engine and vehicle monitoring under normal operation, for diagnosis or tuning
- Reducing premiums with some US auto insurance companies if OBD-II vehicle data loggers or cameras are installed
OBD-II Codes
- Consist of a five-digit alphanumeric code
- Formats:
- First character (letter): denotes the part of the vehicle with a fault
- Second character (number): 0, 1, 2, or 3, indicating standardized (SAE) code or manufacturer-specific code
- Third character (number/letter): denotes the particular vehicle system with a fault
Interpreting OBD-II Codes
- Examples of codes and their meanings:
- P0102: Mass or Volume Air Flow Circuit low Input
- P0106: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
- P0113: Intake Air Temperature Circuit High Input (Sensor 1)
- P0118: Engine Coolant Temperature Circuit High Input
- P0301: Cylinder 1 Misfire Detected
Diagnostic Steps for OBD-II Codes
- Examples of diagnostic steps for each code:
- P0102: Inspect wiring and power to the OBD sensor, use code reader to pull engine codes, check voltage of OBD sensor
- P0106: Use advanced scanner to pull engine codes, diagnose MAP sensor, inspect air intake system for leaks
- P0113: Use advanced scanner to pull engine codes, view live data from IAT sensor, check wiring for opens and loose connections
- P0118: Use scan tool to pull codes, inspect spark plugs and fuel injectors, check fuel pressure and vacuum leaks
- P0301: Use scan tool to pull codes, inspect spark plugs and fuel injectors in cylinder 1, check fuel pressure and vacuum leaks
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Understanding OBD-II signals and their conversion to serial data for PC-based analysis tools. Learn about ELM and STN1110 OBD Interpreter ICs and their role in reading OBD-II data.
