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.
How To Proceed With Troubleshooting
The hand-held tester can be used during steps 3, 8 and 11.
- VEHICLE BROUGHT TO WORKSHOP
GO TO NEXT STEP
- CUSTOMER PROBLEM ANALYSIS (See CUSTOMER PROBLEM ANALYSIS CHECK
)
GO TO NEXT STEP
- CHECK AND CLEAR DTCs (See DTC CHECK/CLEAR
)
GO TO NEXT STEP
- PROBLEM SYMPTOM CONFIRMATION
- Turn the power switch on (IG).
- Turn the P position switch on, or move the selector lever to the R, N, or D position with the brake pedal depressed to See if any problem symptom occurs.
- SYMPTOM DOES NOT OCCUR (Go to step 5)
- SYMPTOM OCCURS (Go to step 6 )
- SYMPTOM SIMULATION (See HOW TO PROCEED WITH TROUBLESHOOTING
)
GO TO NEXT STEP
- CHECK MULTIPLEX COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING
)
HINT:
The steering lock ECU is connected to the multiplex communication system. Therefore, be sure to check that there are no problems in the multiplex communication system before performing troubleshooting.
GO TO NEXT STEP
- CHECK CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING
)
HINT:
This ECU is connected to the CAN communication system. Therefore, be sure to check that there are no troubles in the CAN communication system before performing troubleshooting.
GO TO NEXT STEP
- DTC CHECK (See DTC CHECK/CLEAR
)
- DTC IS NOT OUTPUT (Go to step 9)
- DTC IS OUTPUT (Go to step 10 )
- PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE
)
Go to step 11
- DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART
)
GO TO NEXT STEP
- CIRCUIT INSPECTION (See DTC C2300 ACT SYSTEM MALFUNCTION
to P POSITION SWITCH INDICATOR LIGHT CIRCUIT
)
GO TO NEXT STEP
- PROBLEM IDENTIFICATION
GO TO NEXT STEP
- REPAIR OR REPLACEMENT
GO TO NEXT STEP
- CONFIRMATION TEST
- GO TO NEXT STEP
- END
Use the Manual With the Right Hardware
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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.