Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.

WARNING:

Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
The removed service plug must always be carried in a pocket of the responsible worker or placed in the tool box during the procedure to prevent the plug from being connected by mistake.
Be sure to wear insulating protective equipment before beginning work on the high voltage system.
Never allow workers other than the responsible person to touch the vehicle containing high voltage parts. To keep others from touching the high voltage parts, these parts must be covered with an insulating sheet except when using them.
Refer to HIGH VOLTAGE PRECAUTIONS .

CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Information. A malfunction may occur if this is not observed.

PERFORM SELF-DIAGNOSIS

WITH CONSULT
1. Perform "All DTC Reading" with CONSULT.
2. Check if the "P2519" is detected in "Self Diagnostic Result" of "EV/HEV".
Is P2519 detected?

YES

Perform hybrid control system diagnosis procedure. Refer to DTC DESCRIPTION .

NO

GO TO STEP 2 .

CHECK FUSE
1. Turn ignition switch is OFF.
2. Pull out 10A fuse (No. 87) and check that the fuse is not blown (open).
  NOTE:
  Refer to FUSE AND FUSIBLE LINK ARRANGEMENT for fuse layout.
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Replace the fuse after repairing the applicable circuit.

CHECK 12V BATTERY CHARGING OUTPUT CIRCUIT - 1

Check connection status Li-ion battery (DC/DC converter) harness connector and Battery terminal with fusible link harness connector.

Is the inspection result normal?

YES

GO TO STEP 4 .

NO

Recover the connection status.

CHECK 12V BATTERY CHARGING OUTPUT CIRCUIT - 2

Check continuity between Li-ion battery (DC/DC converter) harness connector and Battery terminal with fusible link harness connector.

Li - ion battery (DC/DC converter)		Battery terminal with fusible link		Continuity
Connector	Terminal	Connector	Terminal	Continuity
T304	25	T305	6	Existed

Is the inspection result normal?

YES

GO TO STEP 5 .

Repair harness or connector.

PRECONDITIONING

WARNING:
Follow the instructions below before starting the procedure.
1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .
GO TO STEP 6 .

CHECK DC/DC CONVERTER HARNESS CIRCUIT

Remove Li-ion battery. Refer to REMOVAL AND INSTALLATION .

Check continuity between Li-ion battery controller harness connector and DC/DC converter harness connector.

Li-ion battery controller		DC/DC converter		Continuity
Connector	Terminal	Connector	Terminal	Continuity
LB1	18	-	5	Existed

Also check harness for short to ground.

Is the inspection result normal?

YES

GO TO STEP 7 .

Repair harness or connector.

CHECK LI-ION BATTERY CONTROLLER

Check continuity between Li-ion battery controller harness connector.

Li-ion battery controller				Continuity
Connector	Terminal	Connector	Terminal	Continuity
LB1	18	LB1	15	Not existed

Is the inspection result normal?

YES

Replace DC/DC converter [Refer to DISASSEMBLY AND ASSEMBLY ] and Li-ion battery controller [Refer to DISASSEMBLY AND ASSEMBLY ].

Replace Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY .