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
- STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate ignition switch.
OK: System is normal.
NG: GO TO 2.
- PERFORM SELF DIAGNOSIS
Perform SELF-DIAGNOSIS "NATS V5.0" using CONSULT-III.
NOTE: NATS program card is necessary to display the "SELF-DIAGNOSIS".No malfunction is detected: Recheck the starting engine section GO TO 1.
Malfunction related to NATS is detected: GO TO 3.
Malfunctions related to "DON'T ERASE BEFORE CHECKING ENG DIAG" and NATS are detected: GO TO 7.
- IDENTIFYING NATS MALFUNCTION
Self-diagnosis results referring to NATS, but no information about engine self-diagnosis result is displayed on CONSULT-III. Refer to "SYMPTOM MATRIX CHART 1 ".
: GO TO 4.
- NATS TROUBLE DIAGNOSIS
Repair NATS (if necessary, perform "C/U INITIALIZATION" with CONSULT-III.)
: GO TO 5.
- ERASE SELF-DIAGNOSIS
Erase the record of "SELF-DIAGNOSIS" by using CONSULT-III.
: GO TO 6.
- STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate ignition switch.
NG: GO TO 2.
OK: End of inspection.
- IDENTIFYING NATS AND ENGINE CONTROL MALFUNCTION
NATS malfunction and "DON'T ERASE BEFORE CHECKING ENG DIAG" are displayed on the CONSULT-III screen.
NOTE: This indication means that malfunction have been detected in NATS and engine control system.: GO TO 8.
- NATS TROUBLE DIAGNOSIS
Repair NATS according to self-diagnosis results refer to NATS (if necessary, perform "C/U INITIALIZATION" with CONSULT-III.)
NOTE: Do not erase "SELF-DIAGNOSIS" by using CONSULT-III.: GO TO 9.
- IDENTIFYING ENGINE CONTROL MALFUNCTION
Check engine "SELF-DIAGNOSIS" records with a generalized program card instead of the NATS program card.
: GO TO 10.
- ENGINE CONTROL SYSTEM TROUBLE DIAGNOSIS
Repair engine control system if engine related malfunction is detected.
With engine diagnostic codes present, refer to "INDEX FOR DTC ".
Without engine diagnostic codes present, refer to "ENGINE CONTROL SYSTEM ".
NOTE: If only "NATS MALFUNCTION" is displayed, erase the self-diagnosis results.: GO TO 11.
- STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate ignition switch.
OK: GO TO 12.
NG: GO TO 2.
- ERASE SELF-DIAGNOSIS
Erase both NATS and ENGINE "SELF-DIAGNOSIS" records by using CONSULT-III NATS program card and generalized program card.
: GO TO 13
- CONFIRMATION
Perform running test with CONSULT-III in engine "SELF-DIAGNOSIS" mode.
"NO DTC" is displayed: End of inspection.
Malfunction information is displayed: GO TO 2.
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.
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