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ECG ELECTRON COMBUSTION GRAPH FOLLOW THE BOUNCING ELECTRON

ECG ELECTRON COMBUSTION GRAPH FOLLOW THE BOUNCING ELECTRON. UNDERSTANDING THE PATTERN. LAB SCOPE. PULSE WIDTH (P.W.) IS THE TIME THE CIRCUIT IS ON, COMPLETING ITS PATH TO GROUND MEASURED IN MILLISECONDS (m.s.) MEASURED FROM THE BEGINNING OF ON TO THE END OF ON. LAB SCOPE. PULSE WIDTH. ON.

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ECG ELECTRON COMBUSTION GRAPH FOLLOW THE BOUNCING ELECTRON

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  1. ECGELECTRON COMBUSTION GRAPHFOLLOW THE BOUNCING ELECTRON STEVE ZACK

  2. UNDERSTANDING THE PATTERN

  3. LAB SCOPE • PULSE WIDTH (P.W.) IS THE TIME THE CIRCUIT IS ON, COMPLETING ITS PATH TO GROUND • MEASURED IN MILLISECONDS (m.s.) • MEASURED FROM THE BEGINNING OF ON TO THE END OF ON

  4. LAB SCOPE PULSE WIDTH ON PULSE WIDTH OFF OFF

  5. LAB SCOPE • FREQUENCY (Hz) IS THE NUMBER OF TIMES SOMETHING OCCURS WITH IN ONE SECOND • MEASURED IN HERTZ (Hz)

  6. LAB SCOPE FREQUENCY 2 OCCURENCES EVERY SECOND EQUALS 2 Hz 0 10 20 30 40 50 60 70 80 90 1 10 20 30 40 50 60 70 80 90 2 MILLISECONDS

  7. HOOKING UP THE SCOPE

  8. LAB SCOPE • TO TEST A SENSOR, BACK PROBE THE SENSOR SIGNAL RETURN WIRE • TO TEST AN ACTUATOR, BACK PROBE THE COMPUTER CONTROLLED GROUND

  9. SENSOR - BACK PROBE SIGNAL RETURN HALL EFFECT SWITCH

  10. ACTUATOR (INJECTOR) - BACK PROBE COMPUTER CONTROLLED GROUND INJECTOR

  11. LAB SCOPE • NOISE IN A WAVE FORM CAN BE CAUSED BY AN OUTSIDE SOURCE OR MAGNETIC FIELD • ALWAYS USE THE SCOPES CHASSIS GROUND AND HOOK IT TO THE ENGINE BLOCK • KEEP THE SCOPE LEADS AWAY FROM ELECTRICAL DEVISES

  12. GROUND CHASSIS GROUND NOICE

  13. PATTERNINTERPRETATION

  14. SENSOR SIGNAL RETURN - HI PICK UP COIL VSS, WSS, DISTRIBUTER SENSOR SIGNAL RETURN - LO

  15. GOOD PATTERN BAD PATTERN BAD PATTERN WEAK PICKUP COIL MISALIGNED POLE PIECE

  16. SENSORSIGNALRETURN TPS CTS

  17. GOOD PATTERN BAD PATTERN BAD PATTERN BAD PATTERN OPEN IN SENSOR RESISTOR LOW RESISTANCE IN SENSOR HIGH RESISTANCE IN SENSOR

  18. SENSOR SIGNAL RETURN HALL EFFECT SWITCH DISTRIBUTER CRANK SENSOR MAF

  19. GOOD PATTERN GOOD PATTERN BAD PATTERN BAD PATTERN SIGNATURE PROFILE PIP #1 TDC AS LOAD OR SPEED INCREASE, Hz INCREASE TIME CHANGE WITHOUT LOAD CHANGE OFF SIGNAL CRASH

  20. BAD PATTERN BAD PATTERN BAD PATTERN ON SIGNAL NOT STABLE LOOSE GROUND WIRE LOOSE VOLTAGE WIRE

  21. COMPUTERCONTROLLEDGROUND INJECTOR SOLENOID

  22. GOOD PATTERN GOOD PATTERN GOOD PATTERN BAD PATTERN NARROW P.W. - LEAN WIDE P.W. - RICH LOW FREQUENCY HIGH FREQUENCY LEAN RICH LOOSE VOLTAGE WIRE

  23. BAD PATTERN BAD PATTERN LOOSE GROUND WIRE WEAK SOLENOID COIL

  24. ALTERNATOR OUTPUT TO BATTERY + ALTERNATOR CHARGING SYSTEM - ALTERNATOR DIODE

  25. GOOD PATTERN BAD PATTERN BAD PATTERN BAD PATTERN BAD PATTERN BOUNCING BRUSH POSITIVE DIODE SPIKE NEGATIVE DIODE SPIKE OPEN DIODE

  26. BAD PATTERN BAD PATTERN BAD PATTERN FLAT DIODE POOR BRUSH CONTACT EXCESS AC VOLTAGE

  27. O2 SIGNAL RETURN HO2S HEGO EGO O2 SENSOR

  28. GOOD O2 PATTERN SECONDARY OR LEAN MISFIRE

  29. O2 SENSOR TEST LESS THAN 100ms O2 SENSOR MUST SWITCH RICH TO LEAN AND LEAN TO RICH IN LESS THAN 100ms FOR CATALYST TO OPERATE TEST AT 2000 RPM ENGINE AT OPERATING TEMPERATURE

  30. SINGLE SPARK PLUG WIRE TEST - POLARITY MAY NEED TO BE REVERSED TO INVERT PATTERN

  31. PERCEPTION SCOPE - SECONDARY IGNITION TEST • ENGINE HOT • 1000 RPM • SPECIFICATIONS • BURN kV = 1.1 kV TO 2.1 kV • BURN TIME = 1.0 ms TO 1.8 ms • FIRING kV = • 7.5 kV TO 12 kV DISTRIBUTER • 5 kV TO 12 kV DIS

  32. TURBULENCE, INTAKE VALVE, CARBON ON INTAKE VALVE, CARBON ON PLUG GOOD - PATTERN FOULED PLUG - CARBON LOW COMPRESSION

  33. EXHAUST VALVE INTAKE VALVE, LEAN MISFIRE FUEL FOWLING, RICH CONDITION - CONDENSING AT CYLINDER WALLS FOULED PLUG - OIL, FUEL, CARBON

  34. TROUBLE TREECHART

  35. TROUBLE TREE CHART STEP A: TO TEST ALL CIRCUITS AND THE SENSOR. BACK PROBE SIGNAL RETURN AT THE PCM. NO PROBLEM - CIRCUIT OK YES PROBLEM - GO TO STEP B

  36. STEP A PCM

  37. TROUBLE TREE CHART STEP B: TO TEST SENSOR, 5 VOLT AND GROUND CIRCUIT. BACK PROBE SIGNAL RETURN AT THE SENSOR. NO PROBLEM - REPAIR SIGNAL RETURN CIRCUIT YES PROBLEM - ANALOG SENSOR - GO TO STEP C DIGITAL SENSOR - GO TO STEP D

  38. STEP B SENSOR

  39. TROUBLE TREE CHART STEP C: ANALOG SENSOR TO TEST 5 VOLT AND GROUND CIRCUIT. BACK PROBE 5 VOLT AND GROUND CIRCUIT. NO PROBLEM - REPLACE SENSOR YES PROBLEM - REPAIR 5 VOLT OR GROUND CIRCUIT

  40. STEP C 5 VOLT REFERENCE STEP C SENSOR GROUND

  41. TROUBLE TREE CHART STEP D: DIGITAL SENSOR THREE AREAS A - VOLTAGE SUPPLY CIRCUIT (PROBLEMS - REPAIR CIRCUIT) B - SENSOR (PROBLEMS - REPLACE SENSOR) C - GROUND CIRCUIT (PROBLEMS - REPAIR CIRCUIT)

  42. SUMMARYTROUBLE SHOOTING PROCEDURE “B” 5 VOLT “A” “C” 0 VOLT

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