Nissan Pathfinder: Security Control System - Basic Inspection

• Diagnosis and Repair Work Flow
• Additional Service When Replacing Ecm

Diagnosis and Repair Work Flow Nissan Pathfinder R53

Work Flow

OVERALL SEQUENCE

DETAILED FLOW

GET INFORMATION FOR SYMPTOM

1. Get detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurs).

2. Check operation condition of the function that is malfunctioning.

>>

GO TO 2.

CHECK DTC

CONSULT

1. Check DTC.

2. Perform the following procedure if DTC is detected.

   • Record DTC and freeze frame data (print them out).

   • Erase DTC.

   • Study the relationship between the cause detected by DTC and the symptom described by the customer.

3. Check related service bulletins for information.

Are any symptoms described and any DTC detected?

Symptom is described, DTC is detected >> >>

GO TO 3.

Symptom is described, DTC is not detected >> >>

GO TO 4.

Symptom is not described, DTC is detected >> >>

GO TO 5.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.

Also study the normal operation and fail-safe related to the symptom.

Verify relation between the symptom and the condition when the symptom is detected.

>>

GO TO 5.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.

Verify relation between the symptom and the condition when the symptom is detected.

>>

GO TO 6.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC CONFIRMATION PROCEDURE for the detected DTC, and then check that DTC is detected again. At this time, always connect CONSULT to the Nissan Pathfinder vehicle, and check self diagnostic results in real time.

If two or more DTCs are detected, refer to DTC Inspection Priority Chart and determine trouble diagnosis order.

NOTE:

• Freeze frame data is useful if the DTC is not detected.

• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service Manual. This simplified check procedure is an effective alternative though DTC cannot be detected during this check. If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIRMATION PROCEDURE.

Is DTC detected?

YES>>

GO TO 7.

NO>>

Check according to Intermittent Incident.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.

Is the symptom described?

YES>>

GO TO 7.

NO>>

Monitor input data from related sensors or check voltage of related module terminals.

DETECT MALFUNCTIONING PART BY DIAGNOSIS PROCEDURE

Inspect according to Diagnosis Procedure of the system.

Is malfunctioning part detected?

YES>>

GO TO 8.

NO>>

Check according to Intermittent Incident.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replacement.

3. Check DTC. If DTC is detected, erase it.

>>

GO TO 9.

FINAL CHECK

When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the malfunction is repaired securely.

When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the symptom is not detected.

Is DTC detected and does symptom remain?

YES>>

DTC is detected: GO TO 7.

YES>>

Symptom remains: GO TO 4.

NO>>

Before returning the Nissan Pathfinder vehicle to the customer, always erase DTC.

Additional Service When Replacing Ecm Nissan Pathfinder 2025

Description

Performing the following procedure can automatically activate recommunication of ECM and Intelligent Key unit, but only when the ECM is replaced with a new one*. For details, refer to Work Procedure.

*: New one means a virgin ECM that has never been energized on-board.

CAUTION:

When replacing the ECM, always replace it with a new one.

The functions controlled by the ECM does not operate properly in case of reuse of the ECM from another Nissan Pathfinder vehicle.

NOTE:

CONSULT

• When the replaced ECM is not a brand new, the specified procedure (Initialization of Intelligent Key unit and registration of Intelligent Keys).

• If multiple keys are attached to the key holder, separate them before beginning work.

• Distinguish keys with unregistered key IDs from those with registered IDs.

Work Procedure

PERFORM ECM RECOMMUNICATING FUNCTION

1. Install ECM.

2. Contact backside of the registered Intelligent Key* to push-button ignition switch while brake pedal is depressed, then place ignition switch ON.

   *: To perform this step, use the key that is used before performing ECM replacement.

3. Maintain ignition switch in the ON position for at least 5 seconds.

4. Ignition switch OFF.

5. Check that the engine starts.

>>

GO TO 2.

PERFORM ADDITIONAL SERVICE WHEN REPLACING ECM

Refer to Description.

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End.