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.
Work Flow
- CHECK IN
Listen to customer complaints or request (Get symptoms).
NOTE: In rare case, "CHAIN of ECM-IMMU" might be stored as a self-diagnostic result during key registration procedure, even if the system is not malfunction.malfunction: GO TO 2.
Key service request: Perform Initialization. Refer to CONSULT-III operation instructions - NATS-IVIS/NVIS.
- START ENGINE WITH INTELLIGENT KEY
Check if the engine could be started by all registered Intelligent Keys.
Is the inspection result normal?
The engine can be started by all Intelligent Keys: GO TO 3.
The engine cannot be started by some Intelligent Keys: Perform Initialization. Refer to CONSULT-III operation instructions - NATS-IVIS/NVIS.
The engine cannot be started by all Intelligent Keys: GO TO 4.
- START ENGINE WITH INTELLIGENT KEY INTO KEY SLOT
Check if the engine could be started by all Intelligent Keys into key slot.
Is the inspection result normal?
The engine can be started by all Intelligent Keys: GO TO 5.
The engine cannot be started by some Intelligent Keys: Perform Initialization. Refer to CONSULT-III operation instructions - NATS-IVIS/NVIS.
The engine cannot be started by all Intelligent Keys: GO TO 4.
- CHECK "KEY" WARNING LAMP ILLUMINATION
- Intelligent key into key slot.
- When pushing the push-button ignition switch, check if "KEY" warning lamp in combination meter illuminates.
Does "KEY" warning lamp illuminate?
YES: GO TO 7.
NO: Check function of intelligent key system. Refer to "SYSTEM DESCRIPTION "
- CHECK SECURITY INDICATOR OPERATION
Check security indicator lights up when ignition switch is in ON position.
Does security indicator illuminate?
YES: GO TO 7.
NO: GO TO 6.
- CHECK SECURITY INDICATOR OPERATION
Check security indicator blinks when ignition switch is in OFF position.
Is the inspection result normal?
YES: GO TO 7.
NO: Repair security indicator. Refer to "SYMPTOM CHART FOR SECURITY INDICATOR ".
- INTELLIGENT KEY UNIT SELF DIAGNOSIS
Perform Intelligent Key unit SELF-DIAGNOSIS using CONSULT-III.
Is DTC displayed?
YES: GO TO 8.
NO: GO TO 9.
- PERFORM INTELLIGENT KEY UNIT TROUBLE DIAGNOSIS
Check Intelligent Key unit self-diagnostic results item chart. Refer to "CONSULT-III FUNCTIONS (INTELLIGENT KEY) ".
Is the inspection result normal?
YES: GO TO 7.
NO: Perform intelligent key trouble diagnosis again.
- BCM SELF DIAGNOSIS
Perform BCM SELF-DIAGNOSIS using CONSULT-III.
Is DTC displayed?
YES: GO TO 10.
NO: GO TO 11.
- PERFORM BCM TROUBLE DIAGNOSIS
Check BCM self-diagnostic results item chart. Refer to "CONSULT-III FUNCTIONS (BCM-IMMU) ".
Is the inspection result normal?
YES: GO TO 9.
NO: Perform BCM trouble diagnosis again.
- ECM SELF DIAGNOSIS
Perform ECM SELF-DIAGNOSIS using CONSULT-III.
Is DTC displayed?
P1610-P1615 is displayed: GO TO 12.
No DTC is displayed: GO TO 2.
Another code different from (P1610-P1615) is displayed.: Go to Engine Control Information.
- PERFORM ECM TROUBLE DIAGNOSIS
Check ECM self-diagnostic results item chart. Refer to "CONSULT-III FUNCTIONS (BCM-IMMU) ".
Is the inspection result normal?
YES: GO TO 11.
NO: Perform ECM trouble diagnosis again.
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.