Automotive Scan Tool PID Diagnostics

<p>Automotive Scan Tool PID Diagnostics<br>Diagnostics Strategies of Modern Automotive Systems<br>By Mandy Concepcion<br><br>In this section the different techniques of scan tool parameter (PID) analysis will be exposed. Techniques involving PID analysis are quickly catching on due to their speed and accuracy. By properly analyzing the different scanner PIDs the technician can arrive at the source of the problem much faster and accurately. These procedures give rise to the new term driver seat diagnostics since most of the preliminary diagnostic work is done through the scanner. However these techniques will in no way replace the final manual tests that are a part of every diagnostic path. They are simply geared to point the technician in the right direction.<br><br>Table of Contents<br><br>- INTRODUCTION (Introduction to scan tool diagnostics and the relevance of using PIDs or scanner parameter to perform the first leg of all diagnostics.)<br><br>- Theory of Operation Behind the Different PIDs (Describes CARB the difference between generic and enhanced PIDs the FTP)<br><br>- OBD II Generic PIDs (PID calculated and actual values calculated data relationships base injection timing ECM value substitution)<br><br>- OBD I & II General PID analysis (erasing code-or not recording analyzing and pinpoint tests separating PIDs into groups)<br><br>- Fuel Delivery Fault Detection (fuel delivery issues intake air temp. sensor BARO sensor Engine LOAD RPM PID Short-Term Fuel Trims Long-Term Fuel Trims 60% of check engine light issues block learn/integrators Example 1: injector fault Example 2: intake gasket issues fuel status ignition timing MAP/MAF TPS O2 sensor IAC Closed Throttle injector pulse width voltage power injector duty-cycle fuel trim cell)<br><br>- Test #1 (Determining an engine's fuel Consumption (rich-lean operation duty-cycle to fuel trim relationship O2 sensor to fuel trim relation FT and vacuum leaks ignition timing and idle control test conclusion)<br><br>- Test # 2 (Misfire Detection Strategy EGR Ignition and Mechanical misfires) (misfires and OBD2 scanner misfire detection - a time saver OBD2 40 and 80 cycle misfire ignition injector and EGR density misfire coil-on-plug misfires and O2 sensor lean O2 & Secondary misfire O2 sensor & injector misfires leaky injector EGR and the MAP Type A B C misfires test conclusion)<br><br>- Test # 3 (Air/Fuel Ratio Faults) (air-fuel imbalance MAF and post O2 sensors open-closed-loop fuel enable HC & CO relation to AF issues test conclusion)<br><br>- Test # 4 (BARO MAP & MAF PID analysis) (MAP & valve timing faults ECM behavior fuel delivery or duty cycle test volumetric efficiency test conclusion)<br><br>- Test # 5 (Clogged exhaust) (clogged catalytic converter detection TPS MAF and converters idle and WOT or wide open throttle values vacuum readings MAP to WOT chats analysis engine and MAP vacuum test conclusion)<br><br>- Test # 6 (EGR Fault Detection) (EGR and MAP values ECM reaction to EGR issues EGR temp sensor DPFE sensor EGR and O2-MAP and lift position sensor EGR and engine pre-loading EGR and the ECM erroneous high LOAD issues test conclusion)<br><br>- Test # 7 (O2 Sensor Heater) (O2 heaters and why? tough to check O2 heater issues O2 heater effect on signal output O2 heater bias voltage engine off and O2 changing value test conclusion)<br><br>- Test # 8 (Resetting Fuel Trims) (resetting injection pulse corrections long-term and short-term fuel trims learn condition Lambda case study on fuel trims FT resetting according to manufacturer test conclusion)<br><br>- Test # 9 (Engine Cranking Vacuum Test) (MAP/MAF cranking vacuum vacuum to PID analysis vacuum leaks gauge-PID test sources of leaks cranking values test conclusion)</p>