Hi, this is Susie Thompson. You had my car for a week and when I picked it up yesterdayyou told me the car was fixed and charged me $350 for the repairs. Now I am stranded

because my car just broke down again.

What are you going to do about this?

What’s going on with this car?

I test drove it up and down the street and around the block. I was sure the problem was fixed when the

MIL did not turn on again.

I know the old part was defective and I am sure the new part is functioning properly.

How could I have reduced the chances ofa comeback to a minimum?

How could I have seen the actual data thePCM used to make its decision?

What is Mode $06?

What is the $ sign all about?

OBDII Diagnostic Modes

Mode 1: Data StreamMode 2: Freeze-Frame DataMode 3: Diagnostic Trouble Codes (DTCs)Mode 4: Clear Codes & Freeze Frame DataMode 5: Oxygen Sensor MonitorMode 6: Non-Continuous MonitorsMode 7: Continuous MonitorsMode 8: Bi-Directional Communications (Onboard Tests)Mode 9: Vehicle VIN, PCM Calibration Etc.

1. TID = Test Identification2. CID = Component Identification3. TLT = Test Limit 4. Hexadecimal: Example:( $0032)5. Raw Data6. Manufacturer’s Conversion Factor7. Test Value8. Results 9. Limit Type

Illustration 2 in manual

I/M Monitors after DTCs cleared

Illustration 4 in manual

• Hexadecimal numbers are often used by computer - types in place of the base ten numbers you and I use to count our money and balance our check books.

• Hex (for the number six) and decimal (for the number ten) combine to form a numbering system that is base 16. Hexadecimal numbers are also alphanumeric since they’re made up from combinations of the numbers 1 - 9 and letters of the alphabet from A - F.

• Counting to 16 in hexadecimal goes as follows: $01, $02, $03, $04, $05, $06, $07, $08, $09, $0A, $0B, $0C, $0D, $0E, $0F

and $10. Zero is still zero, and is used only as a place holder to indicate – you guessed it – nothing! Using this combination of 16 characters, the computer guys can list all numbers from 1 thru 255 using only two digits. (Funny, but that’s the range often used to describe fuel trim, with 128 being the midpoint! See! It does have a use.)

• To convert a two digit hexadecimal number to base 10, multiply the left number by 16 and add that to the hexadecimal value for the right number. See following examples.

Counting to 16

Decimal Numbers – Right The Decimal number 17 is represented by the

Hexadecimal Number – Left hexadecimal number 11.

$1=1 That’s 16X1 plus 1 X 1 = 17. $2=2 $3=3 Let’s try one more. Convert $E6 to

decimal. Since $E=14 $4=4 and it’s in the “16’s” column, we need to

multiply 14 X 16 $5=5 and then add 6 from the right column to

get the $6=6 decimal equivalent. $7=7 $8=8 (14 X 16) = 224 + 6 = 230. $9=9 $A=10 Using only two hexadecimal digits, we can

count all the way $B=11 to the decimal number 255. $FF = (15 X

16) + 15 = 255. $C=12 $D=13 The decimal number 256 is equal to $100

in hexadecimal. $E=14 That’s (1 X 256) + 0 + 0 = 256. $F=15 $10=16

Illustration 7 in manual

Illustration 8 in manual

Courtesy of Ford Motor Co.

Illustration 9 in manual

Mode 6 data – 2002 Ford Focus – EGR monitorTID - $49 CID $30 Test Value 34471 ($86A7) Test Limit 33536 ($8300)

Test Value:Manufacturer’s Conversion Factor – 34471 – 32768 = 1703 x .0078 = 13.28 in. H2O

Test Limit (Minimum):Manufacturer’s Conversion Factor - 33536 – 32768 = 768 x .0078 = 5.99 in. H20

Raw Data – 32768 times .0078 equals total vacuum/pressure difference in inches of water. (in. H20) with EGR closed.

This test limit has a value of 6 inches of water minimum pressure difference between the pressure registered at point one and that measured inside the intake manifold.

Actual pressure difference: 13.28 in. H20

Minimum pressure difference: 5.99 in. H20 --- EGR monitor passes test.

1998 Ford Ranger 2.5 liter engine

Illustration 3 in manual

1998 Ford Ranger – 2.5 liter engine – (4 cylinder)

1. TID $10 – CID $21 is catalyst monitor for bank two. This vehicle has only one bank and thus this data must be disregarded.

2. TID $10 – CID $11 is catalyst monitor for bank one. This is the proper data to be used to check the efficiency of the catalytic converter.

3. TID $10 CID $11 Test value ($001D) converted to decimal = 29 raw data. Manufacturer's conversion factor = 29 x .0156 = 0.4524. This number can be rounded off to .45.

4. TID $10 CID $11 Test Limit ($0036) converted to decimal = 54 raw data. Manufacturer’s conversion facture = 54 x .0156 = .8424. This number can be rounded off to .84.

5. In this case the maximum allowable is .84. The actual test results are .45. 6. The minimum efficiency allowed is 100 - 84 = 16%. The actual test results

show an efficiency of: 100 - 45 = 55%. This indicates the converter will pass the mode 6 monitor test, however, it is only 55% efficient in storing and releasing oxygen. So if the vehicle fails HC emissions and all other factors have been eliminated, a new OEM converter should solve the problem.

TID CID TEST Test Value Results Test Limit

$01 $01 Catalytic Converter 10 ($000A) Pass 128 ($0080)$02 $01 EVAP 255 ($00FF) Pass 28 ($001C)$02 $02 EVAP 255 ($00FF) Pass 10 ($000A)

$02 $03 EVAP 255 ($00FF) Pass 12 ($000C)

$02 $04 EVAP 255 ($00FF) Pass 32 ($0020)

$04 $02 02 Sensor Heater 8337 ($2091) Pass 261 ($0A3D)$05 $01 EGR 96 ($0060) Pass 64 ($0040)

$05 $02 EGR 79 ($994F) Pass 64 ($0040)

$06 $01 Air Fuel Ratio Sensor 0 ($0000) Pass 20480 ($5000)

$06 $10 Air Fuel Ratio Sensor 0 ($0000) Pass 20480 ($5000)$07 $01 Air fuel Ratio Sensor Heater 35860 ($8C14) Pass 1153 ($0481)$07 $10 Air Fuel Ratio Sensor Heater 35191 ($8977) Pass 1153 ($0481)

1998 Toyota Camry – Mode 6 Data

8337 x .000076 = .633612 (Amps) (Test Value)2621 x .000076 = .199196 (Amps) (Minimum Value)Heater current recorded is good for the proper operation of the HO2S when engine is first started. The current is recorded on initial startup of the engine. The maximum level is displayed in mode 6. As the sensor increases in heat, the resistance increases with a resulting decrease in current flow. This heated HO2S helps the fuel system to go into closed loop operation sooner, thus reducing cold startup emissions. It also prevents the system from going into open loop during extended periods of engine idle.

TID$04

CID$02

Multiply by 0.000076 (Amps) Maximum HO2S heater current(Bank 1 Sensor 2)

Minimum Allowable

TID$04

CID$02

O2 sensor heater

Test Value8337 ($2091)

Pass Minimum Value2621 ($0A3D)

Conversion Factor supplied by Manufacturer

Mode 6 Data Captured by Scanner

TID $04 CID $02 HO2S Heater Circuit

Mode 6 Data Captured by ScannerTID $05 CID $01 EGR Monitor

TID$05

CID$01

TestEGR

Test Value96 ($0060)

ResultsPass

Test Limit64 ($0040)

Conversion Factor Supplied by ManufacturerTID$05

CID$01

Description of test dataEGR gas temp. increasing value

minus malfunction threshold value

Description of Test LimitMalfunction criteria for

insufficient flow

Conversion FactorMultiply by 0.625 and

minus 40 (deg. Centigrade)

Test Limit: 64x0.625 = 40 – 40 = 0 (Degrees Centigrade) Minimum AllowableTest Value: 96x0.625 = 60 – 40 = 20 (Degrees Centigrade) 20 deg. C above In this case the increase in temp. caused by exhaust gases flowing through the EGR valve must be at a minimum of 40 degrees centigrade. This EGR system is causing an increase of 20 degrees centigrade above the minimum. In other words the increase is 40 + 20 = 60 degrees centigrade. If the temp. increase is too little, it could be caused by a partially plugged EGR port.

10 x .0039 = .039 Actual Reading128 x .0039 = .4992 Maximum Allowable (Approximately 50%)100% - 50% = 50% minimum efficiency allowable100%- 4% = 96% Efficient (Actual Efficiency of Catalytic Converter)

TID $01 CID $01 Catalyst Monitor

TID CID Unit Conversion Description of Test Value Test Limit

$01 $01 Multiply by 0.0039Catalyst deterioration levelDetermined by waveforms of front HO2S (A/F Sensor)And rear HO2S

Maximum allowable

TID$01

CID$01

TestCatalytic Converter

Test Value10 ($000A)

ResultsPass

Test Limit128 ($0080)

Mode 6 Data Captured by Scanner

Conversion Factor Supplied by Manufacturer

TID $06 CID $01 Air Fuel Ratio SensorMode 6 Data Captured by Scanner

TID$06

CID$01

TestAir Fuel Ratio

Sensor

Test Value0 ($0000)

ResultsPass

Test Limit20480 ($5000)

Conversion Factor Supplied by Manufacturer

TID$06

CID$01

Unit ConversionMultiply by 0.000244

Description of Test ValueParameter that identifies A/F

sensor response Rate (Bank 1)

Test Limit20480x.000244

Test Value: 0x0.000244 = 0Test Limit: 20480x0.000244 = 4.99712

This is a measurement of the response time, of the A/F sensor, when the PCM richens the fuel mixture. If the response time is 5 or greater, the monitor fails the A/F sensor. If the sensor is close to failure it will not set a code. However, the efficiency of the converter will be decreased and could cause an emissions failure.