Safety Warning
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.
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HOMESERVICE MANUALSLEXUS1997ES 300 V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSDIAGNOSTIC TOOL SET - SOFTWARE COMMUNICATION PROBLEM
1997 Lexus ES 300 V6-3.0L (1MZ-FE)
Diagnostic Tool Set - Software Communication Problem
1997 Lexus ES 300 V6-3.0L (1MZ-FE)SECTION Diagnostic Tool Set - Software Communication Problem
REFERENCE: SPECIAL SERVICE TOOLS
NO.: SSOO1-96
DATE: AUGUST 30, 1996
MODEL: ES 300
VERSION 3.1 DIAGNOSTIC TOOL SET SOFTWARE COMMUNICATION PROBLEM WITH 1997 ES 300

Due to a change in communication standard for the 1997 ES 300, the Version 3.1 Diagnostic Tool Set Software will display the error message below when the technician attempts to use the ALL DATA list or the ACTIVE TEST functions in ENHANCED OBD II.
This problem will be corrected with the release of 1997 Model Year software in November. Until then, there are two alternatives for diagnosing the ES 300 with the current Version 3.1 software:
1. ENHANCED OBD II
^ USER DATA list (less than 50 data lines)
^ Specialized data list from SELECT DATA menu (MISFIRE, O2 SENSOR, EGR, etc.)
2. CARB OBD II
^ All CARB OBD II functions work normally.
NO.: SSOO1-96
DATE: AUGUST 30, 1996
MODEL: ES 300
VERSION 3.1 DIAGNOSTIC TOOL SET SOFTWARE COMMUNICATION PROBLEM WITH 1997 ES 300
Due to a change in communication standard for the 1997 ES 300, the Version 3.1 Diagnostic Tool Set Software will display the error message below when the technician attempts to use the ALL DATA list or the ACTIVE TEST functions in ENHANCED OBD II.
This problem will be corrected with the release of 1997 Model Year software in November. Until then, there are two alternatives for diagnosing the ES 300 with the current Version 3.1 software:
1. ENHANCED OBD II
^ USER DATA list (less than 50 data lines)
^ Specialized data list from SELECT DATA menu (MISFIRE, O2 SENSOR, EGR, etc.)
2. CARB OBD II
^ All CARB OBD II functions work normally.
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.