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.
Inspection Procedure
- CHECK ECUS CONNECTED TO CAN BUS
- Connect the intelligent tester or Techstream to the DLC3.
- Turn the engine switch on (IG) and push the tester main switch ON.
- Check the ECUs connected to CAN bus (see
DIAGNOSIS SYSTEM
).
Result
RESULT CHARTResult Proceed to No malfunction appears A Malfunction appears B
B: GO TO CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )
A: GO TO NEXT STEP
- CHECK DTC (ALL)
- Connect the intelligent tester or Techstream to the DLC3.
- Turn the engine switch on (IG) and push the tester main switch ON.
- Check for DTCs.
Result
RESULT CHARTCondition Proceed to DTC is not output A CAN system DTC is output B LIN system DTC is output C
B: GO TO CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )
C: GO TO LIN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )
A: GO TO NEXT STEP
- CHECK INDICATOR LIGHT OPERATION (ACTIVE TEST)
- Connect the intelligent tester or Techstream to the DLC3.
- Turn the engine switch on (IG) and push the tester main switch ON.
- Enter the following menus:
- Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / BODY / METER / ACTIVE TEST.
- Techstream - Select: Body / Combination Meter / Active Test.
- Check the condition of the pattern select indicator light by operating the tester.
- Intelligent tester
METER
METER TESTER DISPLAY REFERENCETester Display Test Part Control Range Diagnostic Note ECT PWR INDIC Pattern select indicator light (PWR)/ ON or OFF - ECT SNOW INDIC Pattern select indicator light (SNOW)/ ON or OFF - - Techstream
Combination Meter
COMBINATION METER TESTER DISPLAY REFERENCETester Display Test Part Control Range Diagnostic Note Indicat. Lamp ECT PWR Pattern select indicator light (PWR)/ ON or OFF - Indicat. Lamp ECT SNOW Pattern select indicator light (SNOW)/ ON or OFF - OK: Indicator light turns on or off according to the tester operation.
- Intelligent tester
NG: GO TO METER / GAUGE SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )
OK: GO TO NEXT STEP
- CHECK SWITCH SIGNAL (NO. 1 CONSOLE SWITCH DATA LIST)
- Connect the intelligent tester or Techstream to the DLC3.
- Turn the engine switch on (IG) and push the tester main switch ON.
- Enter the following menus:
- Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / BODY / CENTER CONSOLE / DATA LIST.
- Techstream - Select: Body / Center Console Switch / Data List.
- Read the value displayed on the tester.
- Intelligent tester
CENTER CONSOLE
CENTER CONSOLE TESTER DISPLAY REFERENCETester Display Measurement Item/Range Normal Condition Diagnostic Note ECT PWR SW Pattern select switch (PWR) status/ ON or OFF Pattern select switch (PWR) is: - ON: Pushed
- OFF: Not pushed
- ECT SNOW SW Pattern select switch (SNOW) status/ ON or OFF When turning engine switch on (IG): OFF
↓
Pattern select switch (ECT SNOW) is:
Pushed: ON
↓
Pattern select switch (ECT SNOW) is:
Pushed again: OFF- - Techstream
Center Console Switch
CENTER CONSOLE SWITCH TESTER DISPLAY REFERENCETester Display Measurement Item/Range Normal Condition Diagnostic Note ECT Power Mode Switch Pattern select switch (PWR) status/ ON or OFF Pattern select switch (PWR) is: - ON: Pushed
- OFF: Not pushed
- ECT Snow Mode Switch Pattern select switch (SNOW) status/ ON or OFF When turning engine switch on (IG): OFF
↓
Pattern select switch (ECT SNOW) is:
Pushed: ON
↓
Pattern select switch (ECT SNOW) is:
Pushed again: OFF- OK: On tester screen, item changes between ON and OFF according to switch operation.
- Intelligent tester
NG: REPLACE NO. 1 CONSOLE SWITCH
OK: GO TO NEXT STEP
- REPLACE TCM
- Replace the TCM (see REMOVAL ).
NEXT: PERFORM AT REGISTRATION (See REGISTRATION )
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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