2. OBJECTIVES After studying Chapter 4, the reader will be able to:
Access global OBD II on a scan tool.
Identify mode $06 jobs.
Describe how mode $06 can be used to identify a problem.
Explain how to convert raw numbers to usable data.

3. WHAT IS GLOBAL OBD II?
Global OBD II, also called generic OBD II, is the standardized format of on-board diagnostics, following SAE standard J1962.
Global OBD II was designed for engineers: when OBD II was first introduced, it was not intended to be used by service technicians.
Purposes and Functions

4. GLOBAL OBD II MODES
All OBD-II vehicles must be able to display data on a global (generic) scan tool under nine different modes of operation.
These modes include:
Modes 1-9
Hexadecimal Numbers
Generic (global) data is used by most state emission programs.
Generic OBD-II displays often use hexadecimal numbers, which use 16 numbers instead of 10.

5. DIAGNOSING PROBLEMS USING MODE $06
Mode $06 information can be used to diagnose faults by following three steps:
Check the monitor status before starting repairs. This step will show how the system failed.
Look at the component or parameter that triggered the fault. This step will help pin down the root cause of the failure.
Look to the monitor enable criteria, which will show what it takes to fail or pass the monitor.

6. ACCESSING GLOBAL OBD II
Global (generic) OBD II is used by inspectors where emission testing is performed.
Snap-On 2500
Snap-On Solus
Snap-On Modis
OTC Genisys
Master Tech
FIGURE 4-1 The global OBD-II cartridge is needed to access generic OBD data. Follow the displayed message for the specified personality keys.

7. ACCESSING GLOBAL OBD II
FIGURE 4-2 A photo of a Master Tech display, showing where to select global OBD II from the menu.

8. MODE $06
Mode $06 is used by service technicians to monitor the PCM test results of various systems.
While other modes are used for monitoring other functions, mode $06 is used to maintain all continuous and noncontinuous monitors and pending DTCs.
Using Mode $06
See test results that are close to failing
Verify a repair
Reading Mode $06 Data

9. MODE $06 Select Monitor Data Display
The first step is to select the monitor (fuel trim, misfire, catalyst, etc.)
There could be three results:
Incomplete.
Pass.
Fail.
Data Display

10. OXYGEN SENSOR HEATER MODE $06 TEST (GENERAL MOTORS)
This fault can set a P0141 DTC for bank 1, sensor 1 (B1S1).
Checking service information indicates the following enable criteria for the code to set:
Cold engine start
Engine at idle speed
Engine operating temperature below 150°F (66°C)

11. OXYGEN SENSOR HEATER MODE $06 TEST (GENERAL MOTORS)
The following monitors are suspended:
EVAP
Oxygen sensor performance
Catalyst
Mode $06 data for B1S1 heater circuit in TID-06, CID-41:
The maximum limit—186
Measure value = 33
Minimum limit = -----
Result = passed

12. ENGINE MISFIRE TESTS (FORD)
A misfire fault can set a random misfire DTC of P0300 or one or more individual misfire DTCs P0301 through P0310 for cylinders one through 10.
The enable criteria for these codes to set include:
Time since engine start 5 seconds
Engine coolant temperature 20°F(7°C)to 250°F (121°C)
RPM range from idle to redline or fuel cutoff
Fuel level 15% minimum

13. FORD OXYGEN SENSOR MODE $06 TEST
Ford and other companies have many tests performed on the oxygen sensor, including voltage amplitude.
For example, Ford TID $01, CID $21 for HO2S1 shows:
Minimum value = 512
Maximum value = N/A
Current value = 794

14. GENERAL MOTORS CAN OXYGEN SENSOR MODE $06 TEST
One of the oxygen sensor tests performed on a General Motors vehicle equipped with CAN (GMCAN) is the rich-to-lean sensor switch time.
Typical test results show:
Monitor ID (MID) $01
Test ID $05
Maximum limit = sec.
Measured value = sec.
Minimum value = sec.
Result = passed

15. FORD EGR TESTS
Ford checks many functions of the exhaust gas recirculation (EGR) system, including flow testing and tests of the sensor used to check the flow of exhaust gases.
The duty cycle of the EGR solenoid can be checked using mode $06 by looking at the following:
TID $4B
CID $30
Maximum limit = 26,214
Measured value =14,358
Minimum value =-----
Test results = passed

16. FORD EGR TESTS Ford Delta Pressure for EGR FlowTest
In this test, the following occurred on a test vehicle:
TID 4A
CID 30
Maximum limit =
Measured value = 2,226
Minimum limit = 768
Result = passed

17. GENERAL MOTORS CATALYST EFFICIENCY TEST
The scan tool displays data that does not need to be converted, although the units are often unknown.
The service technician can, however, see how close the test results come to either the maximum or the minimum limits.
For example, a General Motors idle catalyst efficiency test could have the results following:
TID 0C
CID 60
Maximum limit = 33,234
Measured value =17,708
Minimum limit = -----
Result = passed

18. GENERAL MOTORS EVAP TEST (CAN)
One of the evaporative (EVAP) system tests that can be monitored using a scan tool and mode $06 data is the engine off, natural vacuum test.
An example of a typical result includes:
MID EVAP – 0.020
TID 201
Minimum value = 0.000
Maximum value = 0.601
Current value = 0.023

19. WHERE TO GET MODE $06 INFORMATION
Many scan tools display all of the parameters and information needed so that additional mode $06 data is not needed.
Many vehicle manufacturers post mode $06 information on the service information websites.
This information is often free, unlike other service information.

20. SUMMARY
Global OBD II can be used by a service technician to do the following:
Check the PCM regarding what it has detected as a fault
Verify a repair
Check if the test results are close to failure, which could trigger the MIL
Global OBD II has nine modes, each covering a certain aspect of the diagnostic system.
Mode $06 is the most commonly used mode of global OBD II because it includes data on the noncontinuous monitored system.
Most aftermarket scan tools and some original equipment scan tools can access global OBD II data.
Many Ford mode $06 data requires that the displayed number be converted to show usable values.

21. REVIEW QUETSIONS What are the nine modes of global (generic) OBD II?
How do hexadecimal numbers differ from base 10 numbers?
Why does some mode $06 data need to be translated into plain English?
Where can mode $06 data information be obtained?

22. CHAPTER QUIZ What is global (generic) OBD II?
A standardized format that meets SAE standard J1962
A format originally designed for engineers
The same for all numbers and models of vehicles
All of the above

23. CHAPTER QUIZ What is global (generic) OBD II?
A standardized format that meets SAE standard J1962
A format originally designed for engineers
The same for all numbers and models of vehicles
All of the above

24. CHAPTER QUIZ
2. Mode $06 can be used to verify a repair by checking _____.
The component system test passed
DTCs
Sensor values
A captured freeze-frame

25. CHAPTER QUIZ
2. Mode $06 can be used to verify a repair by checking _____.
The component system test passed
DTCs
Sensor values
A captured freeze-frame

26. CHAPTER QUIZ 3. Mode $06 is the mode that checks which systems?
Oxygen sensors
Continuously monitored systems
Noncontinuously monitored systems
Current powertrain data (PIDs)

27. CHAPTER QUIZ 3. Mode $06 is the mode that checks which systems?
Oxygen sensors
Continuously monitored systems
Noncontinuously monitored systems
Current powertrain data (PIDs)

28. CHAPTER QUIZ
4. The hexadecimal number for 12 is _____. 12 $A $B $C

29. CHAPTER QUIZ
4. The hexadecimal number for 12 is _____. 12 $A $B $C

30. CHAPTER QUIZ
5. Technician A says that by looking at the mode $06 data, the technician can determine how close a component or system came to passing the onboard test. Technician B says that the data shown may have to be converted to obtain values that are meaningful to the technician. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B

31. CHAPTER QUIZ
5. Technician A says that by looking at the mode $06 data, the technician can determine how close a component or system came to passing the onboard test. Technician B says that the data shown may have to be converted to obtain values that are meaningful to the technician. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B

32. CHAPTER QUIZ 6. The data display usually shows what information?
Upper limit and lower limit
Upper limit or lower limit
Test results
Both b and c

33. CHAPTER QUIZ 6. The data display usually shows what information?
Upper limit and lower limit
Upper limit or lower limit
Test results
Both b and c

34. CHAPTER QUIZ
7. An oxygen sensor switch time from rich to lean is identified as test identification (TID) _____.
$05
$0A
$02
$09

35. CHAPTER QUIZ
7. An oxygen sensor switch time from rich to lean is identified as test identification (TID) _____.
$05
$0A
$02
$09

36. CHAPTER QUIZ
8. Type A misfire codes are those that can damage the catalytic converter and usually have misfires that range from _____ at idle to _____ at high engine speeds.
10%, 20%
40%, 4%
25%, 25%
2%, 4%

37. CHAPTER QUIZ
8. Type A misfire codes are those that can damage the catalytic converter and usually have misfires that range from _____ at idle to _____ at high engine speeds.
10%, 20%
40%, 4%
25%, 25%
2%, 4%

38. CHAPTER QUIZ
9. A General Motors vehicle is being checked using mode $06 for the proper operation of the oxygen sensor. The rich-to-lean sensor switch time is seconds. Technician A says that this indicates a slow reacting oxygen sensor. Technician B says that the oxygen sensor is reacting correctly and is okay. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B

39. CHAPTER QUIZ
9. A General Motors vehicle is being checked using mode $06 for the proper operation of the oxygen sensor. The rich-to-lean sensor switch time is seconds. Technician A says that this indicates a slow reacting oxygen sensor. Technician B says that the oxygen sensor is reacting correctly and is okay. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B

40. CHAPTER QUIZ 10. Mode $06 information can be accessed at _____.
All of the above

41. CHAPTER QUIZ 10. Mode $06 information can be accessed at _____.
All of the above