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

Turn ignition switch ON.
CAUTION:
Never bring into READY.
Check "CELL VOLTAGE 01 - 96" of "DATA MONITOR" mode.

Identify a cell voltage which is +- 100 mV or more higher than the mean voltage of all the cells, and check if the voltage fluctuation pattern of abnormal cells applies to any one of the conditions below.

The voltage of four serial cells respectively drops almost equally (1 - 4, 5 - 8, 9 - 12, 13 - 16, 17 - 20, 21 - 24, 25 - 28, 29 - 32, 33 - 36, 37 - 40, 41 - 44, 45 - 48, 49 - 52, 53 - 56, 57 - 60, 61 - 64, 65 - 68, 69 - 72, 73 - 76, 77 - 80, 81 - 84, 85 - 88, 89 - 92, 93 - 96).

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The voltage of three serial cells respectively fluctuates almost equally or in a staircase pattern (1 - 3, 5 - 7, 9 - 11, 13 - 15, 17 - 19, 21 - 23, 25 - 27, 29 - 31, 33 - 35, 37 - 39, 41 - 43, 45 - 47, 49 - 51, 53 - 55, 57 - 59, 61 - 63, 65 - 67, 69 - 71, 73 - 75, 77 - 79, 81 - 83, 85 - 87, 89 - 91, 93 - 95).

Courtesy of NISSAN NORTH AMERICA, INC.

The potential difference between two adjacent cells fluctuates unsymmetrically.

Courtesy of NISSAN NORTH AMERICA, INC.

The potential difference of two adjacent cells fluctuates symmetrically.

Courtesy of NISSAN NORTH AMERICA, INC.

Does the voltage fluctuation pattern of abnormal cells apply to any one of the above conditions?

When the voltage of four serial cells respectively drops almost equally

GO TO STEP 2 .

When the voltage of three serial cells respectively fluctuates almost equally or in a staircase pattern, the potential difference of two adjacent cells fluctuates unsymmetrically, or it fluctuates symmetrically

GO TO STEP 7 .

When it does not apply to any one of them, and a single cell is abnormal

GO TO STEP 9 .

When it does not apply to any one of them, and multiple cells are abnormal

Check the module layout. If two or more modules are abnormal, replace all of the 12 modules. Refer to DISASSEMBLY AND ASSEMBLY .

PRECONDITIONING-1

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 3 .

CHECK HARNESS-1

Remove Li-ion battery. Refer to REMOVAL AND INSTALLATION .
Disconnect harness connectors of Li-ion battery controller and module including an abnormal cell.
CAUTION:
Check the connection condition before disconnecting harness connector.

Check continuity between Li-ion battery controller harness connector and cell (module) harness connector.

Module No.	Cell No.	Module		Li-ion battery controller		Continuity
Module No.	Cell No.	Connector	Terminal	Connector	Terminal	Continuity
Module 1	Cell 1	LB8	1	LB3	50	Existed
	Cell 3		3		51
	Cell 5		5		52
	Cell 7		7		53
	Cell 2	LB7	2	LB3	34
	Cell 4		4		35
	Cell 6		6		36
	Cell 8		8		37
Module 2	Cell 9	LB10	1	LB3	54	Existed
	Cell 11		3		55
	Cell 13		5		56
	Cell 15		7		57
	Cell 10	LB9	2	LB3	38
	Cell 12		4		39
	Cell 14		6		40
	Cell 16		8		42
Module 3	Cell 17	LB12	1	LB3	58	Existed
	Cell 19		3		59
	Cell 21		5		60
	Cell 23		7		61
	Cell 18	LB11	2	LB3	43
	Cell 20		4		44
	Cell 22		6		45
	Cell 24		8		46
Module 4	Cell 25	LB14	1	LB3	62	Existed
	Cell 27		3	LB3	63
	Cell 29		5	LB4	77
	Cell 31		7	LB4	78
	Cell 26	LB13	2	LB3	47
	Cell 28		4	LB3	48
	Cell 30		6	LB4	65
	Cell 32		8	LB4	66
Module 5	Cell 33	LB16	1	LB4	80	Existed
	Cell 35		3		81
	Cell 37		5		82
	Cell 39		7		83
	Cell 34	LB15	2	LB4	69
	Cell 36		4		70
	Cell 38		6		71
	Cell 40		8		72
Module 6	Cell 41	LB18	1	LB4	84	Existed
	Cell 43		3		85
	Cell 45		5		86
	Cell 47		7		87
	Cell 42	LB17	2	LB4	73
	Cell 44		4		74
	Cell 46		6		75
	Cell 48		8		76
Module 7	Cell 49	LB20	1	LB5	110	Existed
	Cell 51		3		111
	Cell 53		5		112
	Cell 55		7		113
	Cell 50	LB19	2	LB5	90
	Cell 52		4		91
	Cell 54		6		92
	Cell 56		8		93
Module 8	Cell 57	LB22	1	LB5	114	Existed
	Cell 59		3		115
	Cell 61		5		116
	Cell 63		7		117
	Cell 58	LB21	2	LB5	94
	Cell 60		4		95
	Cell 62		6		96
	Cell 64		8		97
Module 9	Cell 65	LB24	1	LB5	118	Existed
	Cell 67		3		119
	Cell 69		5		120
	Cell 71		7		121
	Cell 66	LB23	2	LB5	99
	Cell 68		4		100
	Cell 70		6		101
	Cell 72		8		102
Module 10	Cell 73	LB26	1	LB5	122	Existed
	Cell 75		3		123
	Cell 77		5		124
	Cell 79		7		125
	Cell 74	LB25	2	LB5	103
	Cell 76		4		104
	Cell 78		6		105
	Cell 80		8		106
Module 11	Cell 81	LB28	1	LB5	127	Existed
	Cell 83		3	LB5	128
	Cell 85		5	LB6	137
	Cell 87		7	LB6	138
	Cell 82	LB27	2	LB5	107
	Cell 84		4	LB5	108
	Cell 86		6	LB6	130
	Cell 88		8	LB6	131
Module 12	Cell 89	LB30	1	LB6	140	Existed
	Cell 91		3		141
	Cell 93		5		142
	Cell 95		7		143
	Cell 90	LB29	2	LB6	132
	Cell 92		4		133
	Cell 94		6		134
	Cell 96		8		135

Is the inspection result normal?

YES

GO TO STEP 4 .

Repair harness or connector.

CHECK THE HISTORY OF REPLACEMENT-1

Check the latest replacement history of the module or battery pack assembly.

Is there a history of part replacement?

YES-1

When there is a history of replacing all of the 12 modules, GO TO STEP 5 .

YES-2

When there is a history of replacing single module, replace all of the 12 modules and Li-ion battery controller. However, when replacing a module replaced in the past, it is possible to replace it as a single module replacement if the Li-ion battery is within 17 months from the manufacturing date. In this case, replace only module including an abnormal cell and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

YES-3

When there is a history of battery pack assembly replacement, GO TO STEP 6 .

NO

GO TO STEP 6 .

CHECK THE HISTORY OF REPLACEMENT-2

Check the module manufacturing date recorded during the replacement of all the 12 modules.

Is it more than 17 months from the date of manufacture?

YES

Replace all of the 12 modules and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

NO

Replace a module including abnormal cell and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

CHECK THE DATE OF MANUFACTURE OF LI-ION BATTERY-1

Check the battery pack assembly manufacturing date included in the module serial number label. For the label location, refer to INSPECTION .

Is it more than 17 months from the date of manufacture?

YES

Replace all of the 12 modules and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

NO

Replace a module including abnormal cell and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

PRECONDITIONING-2

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 8 .

CHECK HARNESS-2

Remove Li-ion battery. Refer to REMOVAL AND INSTALLATION .
Disconnect harness connectors of Li-ion battery controller and module including an abnormal cell.
CAUTION:
Check the connection condition before disconnecting harness connector.

Check continuity between Li-ion battery controller harness connector and cell (module) harness connector.

Module No.	Cell No.	Module		Li-ion battery controller		Continuity
Module No.	Cell No.	Connector	Terminal	Connector	Terminal	Continuity
Module 1	Cell 1	LB8	1	LB3	50	Existed
	Cell 3		3		51
	Cell 5		5		52
	Cell 7		7		53
	Cell 2	LB7	2	LB3	34
	Cell 4		4		35
	Cell 6		6		36
	Cell 8		8		37
Module 2	Cell 9	LB10	1	LB3	54	Existed
	Cell 11		3		55
	Cell 13		5		56
	Cell 15		7		57
	Cell 10	LB9	2	LB3	38
	Cell 12		4		39
	Cell 14		6		40
	Cell 16		8		42
Module 3	Cell 17	LB12	1	LB3	58	Existed
	Cell 19		3		59
	Cell 21		5		60
	Cell 23		7		61
	Cell 18	LB11	2	LB3	43
	Cell 20		4		44
	Cell 22		6		45
	Cell 24		8		46
Module 4	Cell 25	LB14	1	LB3	62	Existed
	Cell 27		3	LB3	63
	Cell 29		5	LB4	77
	Cell 31		7	LB4	78
	Cell 26	LB13	2	LB3	47
	Cell 28		4	LB3	48
	Cell 30		6	LB4	65
	Cell 32		8	LB4	66
Module 5	Cell 33	LB16	1	LB4	80	Existed
	Cell 35		3		81
	Cell 37		5		82
	Cell 39		7		83
	Cell 34	LB15	2	LB4	69
	Cell 36		4		70
	Cell 38		6		71
	Cell 40		8		72
Module 6	Cell 41	LB18	1	LB4	84	Existed
	Cell 43		3		85
	Cell 45		5		86
	Cell 47		7		87
	Cell 42	LB17	2	LB4	73
	Cell 44		4		74
	Cell 46		6		75
	Cell 48		8		76
Module 7	Cell 49	LB20	1	LB5	110	Existed
	Cell 51		3		111
	Cell 53		5		112
	Cell 55		7		113
	Cell 50	LB19	2	LB5	90
	Cell 52		4		91
	Cell 54		6		92
	Cell 56		8		93
Module 8	Cell 57	LB22	1	LB5	114	Existed
	Cell 59		3		115
	Cell 61		5		116
	Cell 63		7		117
	Cell 58	LB21	2	LB5	94
	Cell 60		4		95
	Cell 62		6		96
	Cell 64		8		97
Module 9	Cell 65	LB24	1	LB5	118	Existed
	Cell 67		3		119
	Cell 69		5		120
	Cell 71		7		121
	Cell 66	LB23	2	LB5	99
	Cell 68		4		100
	Cell 70		6		101
	Cell 72		8		102
Module 10	Cell 73	LB26	1	LB5	122	Existed
	Cell 75		3		123
	Cell 77		5		124
	Cell 79		7		125
	Cell 74	LB25	2	LB5	103
	Cell 76		4		104
	Cell 78		6		105
	Cell 80		8		106
Module 11	Cell 81	LB28	1	LB5	127	Existed
	Cell 83		3	LB5	128
	Cell 85		5	LB6	137
	Cell 87		7	LB6	138
	Cell 82	LB27	2	LB5	107
	Cell 84		4	LB5	108
	Cell 86		6	LB6	130
	Cell 88		8	LB6	131
Module 12	Cell 89	LB30	1	LB6	140	Existed
	Cell 91		3		141
	Cell 93		5		142
	Cell 95		7		143
	Cell 90	LB29	2	LB6	132
	Cell 92		4		133
	Cell 94		6		134
	Cell 96		8		135

Is the inspection result normal?

YES

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

Repair harness or connector.

CHECK THE HISTORY OF REPLACEMENT-3

Check the latest replacement history of the module or battery pack assembly.

Is there a history of part replacement?

YES-1

When there is a history of replacing all of the 12 modules, GO TO STEP 10 .

YES-2

When there is a history of replacing single module, GO TO STEP 12 .

YES-3

When there is a history of battery pack assembly replacement, GO TO STEP 11 .

NO

GO TO STEP 11 .

CHECK THE HISTORY OF REPLACEMENT-4

Check the module manufacturing date recorded during the replacement of all the 12 modules.

Is it more than 17 months from the date of manufacture?

YES

Replace all of the 12 modules and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

NO

Replace a module including abnormal cell and Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

CHECK THE DATE OF MANUFACTURE OF LI-ION BATTERY-2

Check the battery pack assembly manufacturing date included in the module serial number label. For the label location, refer to INSPECTION .

Is it more than 17 months from the date of manufacture?

YES

Replace all of the 12 modules. Refer to DISASSEMBLY AND ASSEMBLY .

NO

Replace a module including abnormal cell. Refer to DISASSEMBLY AND ASSEMBLY .

CHECK THE HISTORY OF REPLACEMENT-5

Check the module manufacturing date recorded during the replacement of a module.

Is it more than 17 months from the date of manufacture?

YES

Replace all of the 12 modules. However, when replacing a module replaced in the past, replace Li-ion battery controller together with the modules. Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).

NO

Replace a module including abnormal cell. However, when replacing a module replaced in the past, replace Li-ion battery controller together with the module Refer to DISASSEMBLY AND ASSEMBLY (Module) or DISASSEMBLY AND ASSEMBLY (Li-ion battery controller).