AT 261 - Chapter 8 Sensors, Inputs, and Scan tools (part 1)Name: _________________________________________Date: __________________________________________OBD I, Code Retrieval - Ford EEIC IV KOEO Self Test - Intermittent Faults, and Continuous CodesTools you will need:Paper Clip – Special Tool PC 101Test LampMercury SableMitchell's On DemandCODE TYPES AND FORMATS - TYPES OF CODES HARD FAULTS (Continuous Codes)Hard faults are problems that the computer has located RIGHT NOW. Examples are a sensor out of range or a broken wire (open circuit). Hard faults are the FIRST set of slow codes output in a Key On Engine Off test. BEFORE the SEPARATOR pulse. SEPARATOR PULSE The separator pulse is a single pulse that indicates the END of hard fault codes and the BEGINNING of memory codes. It will show up as a code 10 on most digital testers. MEMORY CODES (Intermittent Codes)Memory codes are problems that the computer has noticed in the past. If for example there was a loose wire to a solenoid that only lost contact while driving but was making contact while testing the system there would be NO HARD FAULT CODE. The code would show up IN MEMORY. The same would happen for a sensor that only went outof range occasionally. Memory codes come out AFTER the separator pulse. MEMORY CODES ARE STORED IN KAM!NOTE: The computer will erase the memory after a certain number of engine re-starts if the problem does not repeat itself. The number of re-starts varies from 20 to 80 depending on the year of the vehicle. The later models keep memory longer. CODE FORMATS Codes are output as a series of pulses. The following charts show the (approximate) timing of the various code pulses. NOTE: Two digit codes are shown. Three digit codes have similar timing. It just takes a little practice to distinguish between two and three digit types. 1HOOKUP See figure below. EEC IV vehicles have two connectors for self-testing the system. They are located on the firewall orthe left or right front fender. The large connector contains the self-test output (STO) and ground (SIG RTN). The smallpigtail is the self-test input (STI). KEY ON ENGINE OFF (KOEO) TEST  Hook up the scan tool. Tell the scan tool what year/make/model and engine size you are working on. Select “ENGINE” Select “KOEO” Select “SLOW CODES” Follow the tester directions: When the tester is complete – exit out, and then go to “REVIEW CODES”What are the codes you received? ________________________________________________________________ Remove the scan tool, and now use the paperclip and test light method. Turn ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).  Hook up light and jumper (or a tester if you have one). Turn key to ON (do not start engine). NOTE: Unhook self test input jumper (or tester if used) at any time during code output to erase memory.  Read hard faults. __________________________________________ Separator Pulse. __________________________________________ Read memory codes. _______________________________________Note - Parts of this text and graphics taken from http://www.dalidesign.com/hbook/eectest.html - 03/31/032ALWAYS REMEMBER! FIX THE FIRST CODE FIRST!Using an OBD II Scan Tool, Codes and Sensors - Intermittent Faults, and Continuous CodesTools you will need:OTC Genisys Scan Tool2001 Honda Accord , 1997 Acura 2.2 CL or 1997 (White) Ford Escort Turn the vehicle to the "ON" position (DO NOT START THE VEHICLE!) Verify the operation of the check engine lamp (MIL), it should come on when the vehicle is turned on, then it should go back out after a few seconds. If it does NOT go out - Get Mr. ReedNote: A MIL that is on indicates that the PCM has detected a fault, and has either a stored trouble code, or a current problem. A MIL that does NOT come on when the vehicle is first turned "on" is a sign of a blown bulb, or someone has tampered with the MIL. Locate the DLC (Data Link Connector)Note: OBDII - Stand for On Board Diagnostics II. OBD II was started in 1996 as a federal law that created a standard connector for vehicle diagnostics as well as terms, and communications protocols for scan tools and diagnostic equipment. The law states that the connector must be under the dash, within 300 mm (about 1 foot) off of the centerline of the steering wheel. Connect the scan tool to the DLC On the scan tool, select "Scan Diagnostics" then “Global OBD I”I from the scan tool. Press "OK" at the "All system readiness tests may not be supported" Select “ENTER” At the “Quick Tests Screen” and then select "Datastream 1” and then “ENGINE”Note: Datastream "shows" what the "processor sees" to the tech. It is in "real time". Write down the data that is shown on the scan tool.Name Amount ScaleEngine RPM 0 RPMThrottle PositionEngine Coolant TempO2 Sensor 1/1 VoltsVehicle SpeedSpark AdvanceAbsolute Load ValueAccel Pedal Pos FAmb Air TemperatureBarro PressureCalc Engine LoadDTC’s SetLong Term FT Bank 1Malfunction Ind LampMan Absolute PressShort Term FT Bank 13A> Setting Codes, and Gathering CluesFor each sensor - highlight the sensor and press the GRAPH button for a visual graph of the sensor What is the reading for the TP sensor ___________________________%. (Norm.) Depress the throttle to WOT What is the reading for the TP sensor @ WOT ___________________________%.  Disconnect the TP sensor Now, what is the reading with the TP sensor disconnected ___________________________%. (Disc.) Reconnect the TP sensor What is the reading for the MAP sensor _________________________ HG (Norm.) (Escort - Pull MAF) Disconnect the MAP sensor (Escort - Pull MAF) Now, what is the reading with the MAP sensor disconnected _________________________ HG (Disc.) Reconnect the MAP sensor What is the reading for the ECT sensor _________________________ Deg F (Norm.) Disconnect the ECT sensor Now, what is the reading with the ECT sensor disconnected _________________________ Deg F (Disc.) Reconnect the ECT sensor What is the reading for the IAT sensor _________________________ Deg F (Norm.) Disconnect the IAT sensor Now, what is the reading with the IAT sensor disconnected _________________________ Deg F (Disc.) Using a jumper wire, short the two pins of the IAT harness together. Now, what is the reading for