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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Controls - Tools to Retrieve Mode 6 Data
1996 Saturn SC2 L4-1.9L DOHC VIN 7SECTION Engine Controls - Tools to Retrieve Mode 6 Data
BULLETIN NO.: 98-T-75
ISSUE DATE: December, 1998
GROUP/SEQ. NO.: General Info-01
CORPORATION NO.: 99-06-04-003
SUBJECT:
Use of Serial Data Link Diagnostic Communication Tools to Retrieve Mode 6 Data (Request On-Board Monitoring Test Results by Test ID)
MODELS AFFECTED:
All 1996-1998 Saturn Vehicles
PURPOSE:
Federal emission regulations require that a vehicle be able to display certain data when interrogated using an off-board tool. One group of data that must be displayed is Mode 6 Data. Within Mode 6 Data is a section that requests EGR flow test results. The following is a description of the EGR flow test results:
Test ID $07 Request EGR flow lest results
Comp ID $OD Request for deceleration test only
Test Value (0D) Scaling of the test value is a 2's complement
signed number: QEMDSTHR
E=(N) counts (2 byte)
Test Limit (0D) Scaling of the test value is a 2's complement
signed number: QEMDSEWN
E=(N) counts (2 byte)
On all 1996-1998 Saturn vehicles, the EGR flow test results are incorrectly displayed in the reverse order. Instead of the test results being displayed Test Value first and Test Limit second, the Test Limit is displayed first and Test Value is displayed second. This must be taken into consideration when displaying Mode 6 Data or when developing communication tools that use Mode 6 Data communication.
IMPORTANT:
The preceding information only affects off-board diagnostic communication tools that use a Mode 6 Data request. The Saturn off-board diagnostic communication tools (Tech 2, PDT, and SSS) do not use Mode 6 Data to interrogate any vehicle data.
ISSUE DATE: December, 1998
GROUP/SEQ. NO.: General Info-01
CORPORATION NO.: 99-06-04-003
SUBJECT:
Use of Serial Data Link Diagnostic Communication Tools to Retrieve Mode 6 Data (Request On-Board Monitoring Test Results by Test ID)
MODELS AFFECTED:
All 1996-1998 Saturn Vehicles
PURPOSE:
Federal emission regulations require that a vehicle be able to display certain data when interrogated using an off-board tool. One group of data that must be displayed is Mode 6 Data. Within Mode 6 Data is a section that requests EGR flow test results. The following is a description of the EGR flow test results:
Test ID $07 Request EGR flow lest results
Comp ID $OD Request for deceleration test only
Test Value (0D) Scaling of the test value is a 2's complement
signed number: QEMDSTHR
E=(N) counts (2 byte)
Test Limit (0D) Scaling of the test value is a 2's complement
signed number: QEMDSEWN
E=(N) counts (2 byte)
On all 1996-1998 Saturn vehicles, the EGR flow test results are incorrectly displayed in the reverse order. Instead of the test results being displayed Test Value first and Test Limit second, the Test Limit is displayed first and Test Value is displayed second. This must be taken into consideration when displaying Mode 6 Data or when developing communication tools that use Mode 6 Data communication.
IMPORTANT:
The preceding information only affects off-board diagnostic communication tools that use a Mode 6 Data request. The Saturn off-board diagnostic communication tools (Tech 2, PDT, and SSS) do not use Mode 6 Data to interrogate any vehicle data.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.