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1 Advanced Scan Tool Diagnostics Steve Zack Jim Wilson.

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Presentation on theme: "1 Advanced Scan Tool Diagnostics Steve Zack Jim Wilson."— Presentation transcript:

1 1 Advanced Scan Tool Diagnostics Steve Zack Jim Wilson

2 2 CAN Controller Area Network

3 3 Controller Area Network Primary purpose is to network vehicle control module using a Standard protocol –Reduces redundant sensors and or wiring (multiplexing) reducing weight and increasing reliability –Using serial data bus to transfer data Allowing for reliable multiple processor instead of one unreliable large one

4 4 Modes Of Communication

5 5 OBD II Modes MODE 1 –Request For Current Power train Diagnostic Data MODE 2 –Request for Freeze Frame Data MODE 3 –Request for the Emission Related Trouble Codes

6 6 OBD II Modes MODE 4 –Request to Clear/Reset Diagnostic Trouble Codes MODE 5 –Request Oxygen Sensor Monitoring Test Results

7 7 OBD II Mode 6 and 7 MODE 6 –Request for the latest on-board monitoring test results for non- continuous test results MODE 7 –Request for the latest on-board monitoring test results for continuous monitoring systems

8 8 Mode 8 and 9 Mode 8 –Request control of a On-Board System, Test, or Component Mode 9 –Request for Vehicle Identification Number and Calibration IDs

9 9 Mode 6

10 10 Mode 6 Example EGR Monitor The PCM will compare test from a Hexadecimal chart

11 11 Before the monitor test begins the following must be completed –Engine at operating temperature –3 minutes since start up –RPM at specified spec –MAP voltage at specified spec –TPS at specified spec –Vehicle speed at specified spec –STFT at a given minimum level EGR Monitor

12 12 EGR Monitor PCM monitors by change in Short Term Fuel Trim –During operation of the EGR system the PCM will momentarily shut down the EGR solenoid –As a result EGR flow stops and a lean condition occurs –HO2S voltage will drop –STFT sees HO2S voltage drop and increases IPW –The PCM monitors STFT and EGR monitor is complete & Ready

13 13 Diagnostics With Mode 6 & 7 Emission Test Failure or Readiness Monitor –Readiness Status –First checking for pending codes –Next review Datastream for errors –Perform Bi-directional test where applicable –Make repairs –Perform drive cycle to verify

14 14 Diagnostics With Mode 6 & 7 MIL on –Check Diagnostic Trouble Code –Next review Datastream for errors –Perform Bi-directional test where applicable –Make repairs –Perform drive cycle to verify –Verify Readiness Status

15 15 Datastream Diagnostics

16 16 Data Stream Diagnostics Fuel Trim Data

17 17 Fuel Trim

18 18 Fuel Trim

19 19 IAC Counts High Spec 10 to 30 High IAC counts –LTFT over +10 –MAP normal.8 to 1.5 Idle Check ignition Dirty intake valves, Injectors, or Throttle plates Leaking EGR Check fuel pressure and volume Spec 10 to 30 IAC Counts High over 40 –LTFT over +10 –MAP sensor high or MAF sensor low <5 Sticking IAC Dirty intake valves, Injector, or Throttle plates Check fuel pressure and volume Low Manifold pressure or compression problems IAC motor stuck open

20 20 Temperature Sensors

21 21 TPS Low Voltage Code 1) KOEO 2) Closed Throttle –Wiggle throttle shaft If voltage varies a few tenths of a volt –Throttle body is worn If not verify 5 volt reference and ground

22 22 TPS Quick Specs GM Throttle Body Injection.55 to.75 volts=0% closed Cold / Warm GM Port Fuel Injection.29 to.58 volts=0% closed cold.4 to.58 volts closed=0% warm idle running Ford. 8 to 1 volt Wide Open Throttle 4.3 minimum Chrysler.6 to 1.1 volts Wide Open Throttle 2.6 volts above stored minimum TPS

23 23 GM MAP Sensors VacuumVoltageScan Data V V V V V V V V8-9

24 24 GM/Chrysler BARO Readings AltitudeBaro PressureVoltage V 1000 to V 2000 to V 3000 to V 4000 to V

25 25 Chrysler MAP VacuumVoltageScan Data V V V V V V V V 8-9

26 26 Ford MAP Sensors VacuumFrequency in HZ 0159 Hz 3150 Hz 6141 Hz 9132 Hz Hz Hz Hz 2196 Hz

27 27 FORD BARO Readings Altitude Vs. Frequency Hz Hz Hz Hz Hz

28 28 MAP High Voltage Code 1) KOER 2) Measure Engine Vacuum at idle –Vacuum should be at spec approximate 18 in hg If low verify –Cam to crank timing –Vacuum leak –Enriched fuel condition cause

29 29 Cylinder Misfire Testing

30 30 Catalyst Efficiency Monitor Pre-HO2S Post-HO2S Upstream HO2S Downstream HO2S S1 S2 800 mv 450 mv 200 mv 470 mv 450 mv 430 mv

31 31 GM CODES Malfunction Indicator Light Codes Hard codes History Codes Failure Since Clear Failure records Pending codes Freeze frame

32 32 Chrysler Switch Tests OBD2 Enable/Disable Tests Idle Air Control Tests Actuator Test Mode Drive Cycle

33 33 FORD Tests Output State Tests Cylinder Balance Test Ford OBD2 –Output Controls Hi speed Fan On Low Speed Fan On All Outputs On Drive Cycle

34 34 GM OBD2 Bi-Directional Controls GM OBD2 Bi-Directional Controls Crankshaft Relearn EVAP/EGR Controls –Canister Purge Solenoid –Canister Vent Solenoid –EGR Control –EVAP Service Fuel System Controls –Fuel Pump Relay –Injector Disable –Fuel Closed Loop –Fuel Trim Reset

35 35 GM OBD2 Bi-Directional Controls GM OBD2 Bi-Directional Controls Engine Indicator Lamps Transmission Controls Transmission Lamps Accessory Controls Readiness Status O2 Tests Drive cycles

36 36 SCAN Is the scan tool giving good information? Does the sensor data match what the voltmeter or lab scope displays? Will the bi-directional confirm a problem? Does the command that the computer uses make sense? Always check grounds with a DVOM because of sensor data allocation data. Always check Voltage reference supply to sensors. Do sensors move in reaction to others?

37 37 DRIVE CYCLE ENABLE CRITERIA General Motors

38 38 GENERAL MOTORS A/C REFRIGERENT –STEP 1 COLD START ECT LESS THAN 5O DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 ACCELERATE TO 55 MPH, 1/2 THROTTLE, A/C OFF –STEP 3 3 MININUTE STEADY STATE CRUISE 55 AND 60 MPH –STEP 4 DECELERATE TO 20 MPH (CLUTCH OUT) NO BRAKE –STEP 5 ACCELERATE AT 3/4 THROTTLE 55 TO 60 MPH, THEN STEADY STATE CRUISE FOR 5 MINUTES –STEP 6 DECELERATE NO BRAKE, END OF CYCLE

39 39 GENERAL MOTORS AIR SYSTEM –STEP 1 COLD START LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 3 MINUTE STEADY STATE CRUISE 55 AND 60 MPH

40 40 GENERAL MOTORS CATALYST MONITOR –STEP 1 VERIFY ALL OTHER IM FLAGS SET FIRST –STEP 2 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY CRUISE FOR 5 MINUTES

41 41 GENERAL MOTORS COMPREHENSIVE COMPONENTS –STEP 1 COLD START ECT LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE FOR 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 ACCELERATE TO 55 MPH, 1/2 THROTTLE, A/C OFF –STEP 3 3 MINUTES, STEADY STATE CRUISE 55 AND 60 MPH –STEP 4 DECELERATE TO 20 MPH (CLUTCH OUT) NO BRAKE –STEP 5 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY STATE CRUISE FOR 5 MINUTES –STEP 6 DECELERATE NO BRAKE, END OF CYCLE

42 42 GENERAL MOTORS EGR SYSTEM –STEP 1 3 MINUTE, STEADY STATE CRUISE 55 AND 60 MPH –DECELERATE (CLUTCH OUT) NO BRAKE TO LESS THAN 20 MPH

43 43 GENERAL MOTORS EVAP SYSTEM –STEP 1 VERIFY BOTH O2 AND CATALYST MONITORS HAVE COMPLETED –STEP 2 IAT WITHIN 7 DEGREES OF ECT –STEP 3 COLD START ECT LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON. IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 4 ACCELERATE TO 55 MPH, 1/2 THROTTLE, A/C OFF –STEP 5 3 MINUTE, STEADY STATE CRUISE 55 AND 60 MPH –STEP 6 DECELERATE TO 20 MPH (CLUTCH OUT) NO BRAKE –STEP 7 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY STATE CRUISE FOR 5 MINUTES –STEP 8 DECELERATE NO BRAKE, END OF CYCLE

44 44 GENERAL MOTORS FUEL SYSTEM –STEP 1 ACCELERATE TO 55 TO 60 MPH, 1/2 TO 3/4 THROTTLE, A/C OFF –STEP 2 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY STATE CRUISE FOR 5 MINUTES

45 45 GENERAL MOTORS FULL DRIVE CYCLE –STEP 1 COLD START ECT LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 ACCELERATE TO 55 MPH, 1/2 THROTTLE, A/C OFF –STEP 3 3 MINUTE, STEADY STATE CRUISE 55 AND 60 MPH –STEP 4 DECELERATE TO 20 MPH (CLUTCH OUT) NO BRAKE –STEP 5 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY CRUISE FOR 5 MINUTES –STEP 6 DECELERATE NO BRAKE, END OF CYCLE

46 46 GENERAL MOTORS MISFIRE MONITOR –STEP 1 ACCELERATE AT 3/4 THROTTLE TO 55 TO 60 MPH, THEN STEADY STATE CRUISE FOR 5 MINUTES

47 47 GENERAL MOTORS O2 SENSOR –STEP 1 COLD START ECT LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 3 MINUTE, STEADY STATE CRUISE 55 AND 60 MPH

48 48 GENERAL MOTORS O2 SENSOR HEATER –STEP 1 COLD START ECT LESS THAN 50 DEGREES C, WITH A/C AND REAR DEFROST ON, IDLE 2.5 MINUTES IN DRIVE. BEFORE PROCEEDING TURN ACCESSORIES OFF –STEP 2 3 MINUTES, STEADY STATE CRUISE 55 AND 60 MPH

49 49 DRIVE CYCLE ENABLE CRITERIA Chrysler

50 50 CHRYSLER CARS AIR SYSTEM –STEP 1 ENGINE WARM-UP REQUIRED, LEAVE ENGINE RUNNING 15 MINUTES –STEP 2 ENGINE AT IDLE SPEED

51 51 CHRYSLER CARS CATALYST MONITOR –STEP 1 VERIFY ALL OTHER IM FLAGS SET FIRST –STEP 2 COMPLETE ENGINE WARM-UP CYCLE 6 MINUTES –STEP 3 ENGINE AT STEADY THROTTLE OVER 20 MPH FOR 2 MINUTES AND 20 SECONDS

52 52 CHRYSLER CARS EGR SYSTEM –STEP 1 COMPLETE AN ENGINE WARM UP CYCLE 6 MINUTES –STEP 2 STEADY THROTTLE OVER 40 TO 60 MPH FOR 6 TO 8 MINUTES

53 53 CHRYSLER CARS EVAP SYSTEM –STEP 1 VEHICLE WITH LEAK DETECTION PUMP SYSTEM –STEP 2 TEST RUNS IMMEDIATELY AFTER COLD ENGINE STARTUP, WHILE ENGINE SPEED CONTROLLED BY COLD ENGINE SPEED STRATEGY. TOTAL TEST TIME 3 TO 4 MINUTES (LEAK TEST) –STEP 3 RUN ENGINE AT IDLE SPEED FOR 3 MINUTES AFTER WARM-UP (FLOW TEST) –STEP 1 VEHICLE WITHOUT LEAK DETECTION PUMP –STEP 2 COMPLETE AN ENGINE WARM-UP CYCLE 6 MINUTES –STEP 3 RUN ENGINE AT STEADY THROTTLE WITH VEHICLE SPEED OVER 28 TO 48 MPH FOR 1 MINUTE

54 54 CHRYSLER CARS FUEL SYSTEM –STEP 1 COMPLETE AN ENGINE WARM-UP CYCLE 6 MINUTES –STEP 2 RUN ENGINE AT IDLE OR AT CRUISING SPEED

55 55 CHRYSLER CARS FULL DRIVE CYCLE –STEP 1 WARM ENGINE UP IN CLOSED LOOP FOR 5 MINUTES –STEP 2 ENGINE AT STEADY THROTTLE FOR 40 TO 60 MPH FOR 6 TO 8 MINUTES –STEP 3 RETURN VEHICLE TO IDLE FOR 3 MINUTES –STEP 4 TURN KEY OFF, PCM RUNS TEST WITHIN 3 MINUTES AFTER KEY IS OFF –STEP 5 START VEHICLE AND ACCELERATE TO A SPEED GREATER THAN 20 MPH AND DRIVE AT STEADY THROTTLE FOR 2 MINUTES AND 20 SECONDS

56 56 CHRYSLER CARS MISFIRE MONITOR –STEP 1 COMPLETE AN ENGINE WARM-UP CYCLE 6 MINUTES –STEP 2 RUN ENGINE AT IDLE OR AT CRUISING SPEED

57 57 CHRYSLER CARS O2 SENSOR –STEP 1 COMPLETE AN ENGINE WARM-UP CYCLE 6 MINUTES –STEP 2 RUN ENGINE AT OVER 24 MPH, THEN RETURN TO IDLE TO START THE TEST

58 58 CHRYSLER CARS O2 SENSOR HEATER –STEP 1 RUN ENGINE FOR GREATER THAN 5.5 MINUTE PRIOR TO STARTING THE TEST –STEP 2 TURN KEY OFF, PCM RUNS TEST 3 MINUTES AFTER KEY OFF

59 59 DRIVE CYCLE ENABLE CRITERIA Chrysler Truck

60 60 CHRYSLER TRUCK FULL DRIVE CYCLE –STEP 1 START ENGINE UP COLD AND WARM ENGINE UP IN CLOSED LOOP FOR 5 MINUTES –STEP 2 ENGINE AT STEADY THROTTLE FOR 40 TO 60 MPH FOR 6 TO 8 MINUTES –STEP 3 RETURN VEHICLE TO IDLE FOR 3 MINUTES –STEP 4 ACCELERATE TO A SPEED GREATER THAN 20 MPH AND DRIVE AT STEADY THROTTLE FOR 2 MINUTES AND 20 SECONDS

61 61 CHRYSLER TRUCK O2 SENSOR HEATER –STEP 1 BEGINS RIGHT AFTER COLD START UP –STEP 2 TEST BEGINS AT START UP AND CAN LAST 1 MINUTE

62 62 DRIVE CYCLE ENABLE CRITERIA Ford

63 63 FORD AIR SYSTEM –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 VERIFY O2S MONITOR IS COMPLETE –STEP 3 DRIVE IN STOP AND GO TRAFFIC FOR 20 MINUTES WITH 4 IDLE PERIODS –STEP 4 THEN DRIVE AT 45 MPH (+ OR - 5 MPH) FOR 10 MINUTES ( WATCH FOR EVAP COMPLETION), IF NOT DONE DRIVE FOR 2 TO 5 MINUTES MORE

64 64 FORD CATALYST MONITOR –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 MONITOR TO VERIFY CATALYST MONITOR COMPLETES –STEP 3 START ENGINE AND DRIVE VEHICLE FOR 20 TO 25 MINUTES IN STOP AND GO TRAFFIC IN CLOSED LOOP WITH 6 DIFFERENT STEADY SPEEDS 25 TO 40 MPH –STEP 4 THEN DRIVE ON HIGHWAY FOR 10 TO 15 MINUTES WITH NO QUICK ACCELERATION, DECELERATION OR WIDE OPEN THROTTLE EVENTS

65 65 FORD COMPREHENSIVE COMPONENT –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 PERFORM COMPLETE DRIVE CYCLE UNTIL DTC P1000 IS CLEARED –STEP 3 DRIVE IN STOP AND GO TRAFFIC FOR 20 MINUTES WITH 4 IDLE PERIODS –STEP 4 DRIVE ON HIGHWAY FOR 10 TO 15 MINUTES WITH NO QUICK ACCELERATION, DECELERATION OR WIDE OPEN THROTTLE EVENTS

66 66 FORD EGR SYSTEM –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 MONITOR TO VERIFY EGR MONITOR COMPLETES –STEP 3 START ENGINE AND DRIVE VEHICLE FOR 5 TO 6 MINUTES IN STOP AND GO TRAFFIC IN CLOSED LOOP WITH GREATER THAN 2 IDLE PERIODS –STEP 4 THEN ACCELERATE TO OVER 35 MPH AT OVER 1/2 THROTTLE AND HOLD THAT SPEED FOR GREATER THAN 1 MINUTE

67 67 FORD EVAP SYSTEM –STEP 1 IAT BETWEEN 40 TO 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 MONITOR TO VERIFY EVAP MONITOR COMPLETES –STEP 3 VERIFY FUEL LEVEL IS FROM 1/4 TO 3/4 FULL, THEN START ENGINE AND DRIVE ON HIGHWAY FOR 2 MINUTES WITHOUT ANY RAPID ACCELERATION OR DECELERATION –STEP 4 THEN DECELERATE, STOP VEHICLE AND TURN OFF ENGINE FOR 5 SECONDS

68 68 FORD FUEL SYSTEM –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 MONITOR TO VERIFY FUEL MONITOR COMPLETES –STEP 3 START ENGINE AND DRIVE VEHICLE FOR 6 TO 7 MINUTES IN STOP AND GO TRAFFIC IN CLOSED LOOP WITH GREATER THAN 1 IDLE PERIOD –STEP 4 THEN ACCEL TO OVER 35 MPH AT OVER 1/2 THROTTLE AND HOLD THAT SPEED GREATER THAN 1 MINUTE

69 69 FORD FULL DRIVE CYCLE –STEP 1 DRIVE IN STOP AND GO TRAFFIC FOR 20 MINUTES WITH 4 IDLE PERIODS –STEP 2 DRIVE ON HIGHWAY FOR 10 TO 15 MINUTES WITH NO QUICK ACCELERATION, DECELERATION OR WIDE OPEN THROTTLE EVENTS –STEP 3 DECEL AND RETURN TO IDLE, TURN THE KEY OFF

70 70 FORD MISFIRE MONITOR –STEP 1 MONITOR TO VERIFY MISFIRE MONITOR COMPLETES –STEP 2 START AND DRIVE THE VEHICLE TO A LOCATION WHERE SPEEDS CAN REACH 65 TO 66 MPH AND COAST DOWN TO 35 MPH WITHOUT BRAKING OR CLOSED LOOP OPERATION –STEP 3 ACCELERATE ON A HIGHWAY TO 80 MPH AND HOLD THAT SPEED FOR 30 SECONDS, THEN COAST DOWN WITH FOOT OFF THE ACCELERATOR TO 35 MPH. DO ACCELERATION AND DECELERATION CYCLE 3 CONSECUTIVE TINES

71 71 FORD O2 SENSOR –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 VERIFY O2S MONITOR COMPLETES –STEP 3 START ENGINE AND DRIVE VEHICLE FOR 6 TO 7 MINUTES IN STOP AND GO TRAFFIC IN CLOSED LOOP WITH GREATER THAN 1 IDLE PERIOD –STEP 4 THEN ACCELERATE OVER 35 MPH AT OVER 1/2 THROTTLE AND HOLD THAT SPEED FOR GREATER THAN 1 MINUTE

72 72 FORD O2 SENSOR HEATER –STEP 1 IAT BETWEEN 40 AND 100 DEGREES F AND ECT GREATER THAN 130 DEGREES F –STEP 2 VERIFY O2S MONITOR COMPLETES –STEP 3 START ENGINE AND DRIVE VEHICLE 6 TO 7 MINUTES IN STOP AND GO TRAFFIC IN CLOSED LOOP WITH GREATER THAN 1 IDLE PERIOD –STEP 4 THEN ACCELERATE TO OVER 35 MPH AT OVER 1/2 THROTTLE AND HOLD THAT SPEED FOR GREATER THAN 1 MINUTE

73 73 DRIVE CYCLE ENABLE CRITERIA Generic

74 74 GENERIC ENGINE AT OPERATING TEMPERATURE START ENGINE IDLE IN NEUTRAL 4 M IDLE IN DRIVE 40 S ACCELERATE TO 40 MPH AT 1/4 TO 1/2 THROTTLE 10S DRIVE STEADY THROTTLE 45 MPH 30S IDLE IN DRIVE 40S DRIVE IN CITY TRAFFIC 25 TO 40 MPH 15M INCLUDE –5 STOPS TO AN IDLE 10S EACH –ACCELERATE FROM IDLE TO 1/4 TO 1/2 THROTTLE –3 SEPARATE SPEED STEADY THROTTLE AT 90S ACCELERATE TO 45 TO 60 MPH FOR 5M DRIVE AT STEADY THROTTLE AT 45 TO 60 MPH FOR 5M DRIVE AT VARYING SPEEDS FOR 5M BETWEEN 45 TO 60 IDLE IN DRIVE 40S


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