Nissan Altima HL32 Hybrid. Manual - part 689

P2511-149

HBC-505

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

OK

>> GO TO 5.

NG

>> Repair or replace harness or connector.

5.

CHECK FOR INTERMITTENT INCIDENT

Check for intermittent incident. (See 

GI-42, "Intermittent Incident"

)

• Check the connection and terminal contact pressure of connectors and wire harness between the hybrid

vehicle control ECU and the high voltage fuse and fusible link box.

• When the ignition switch ON (READY), jiggle the connectors and wire harness between the hybrid vehicle

control ECU and the high voltage fuse and fusible link box.

OK or NG

OK

>> Replace hybrid vehicle control ECU. (See 

HBC-644, "Removal and Installation"

).

NG

>> Repair malfunctioning parts, component and area.

HBC-506

< COMPONENT DIAGNOSIS >

P2519-766

P2519-766

Description

INFOID:0000000004212109

The hybrid vehicle converter (DC/DC converter) sends IDH signals to the hybrid vehicle control ECU to inform

the ECU of the cooling fan operation condition and the output current limitation condition due to overheating.

DTC Logic

INFOID:0000000004212110

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000004212111

1.

PRECONDITIONING

• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, take safety precautions such as wearing insulated gloves and removing the service

plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent

other technicians from accidentally reconnecting it while you are working on the high-voltage system.

• After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage

connectors or terminals.

• Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with

converter assembly.

>> GO TO 2.

2.

CHECK DTC OUTPUT (HYBRID SYSTEM)

1. Turn ignition switch ON.

2. Check DTC.

Is DTC detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 3.

3.

CHECK BATTERY SMART UNIT

CAUTION:

JMCIA0126GB

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P2519

766

A/C request “A” circuit

Malfunction in the cooling fan op-
eration condition signal circuit

• Battery smart unit
• Hybrid vehicle converter (DC/DC 

converter)

• Wire harness or connector

Result: DTC P0AE6-225 is also output.

P2519-766

HBC-507

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

Be sure to wear insulated gloves.

1. Turn ignition switch OFF and remove the service plug grip (See 

HBC-632, "Precautions for Inspecting the

Hybrid Control System"

).

NOTE:

After removing the service plug grip, do not turn ignition switch ON (READY), unless instructed by the ser-

vice manual because this may cause a malfunction.

2. Connect an oscilloscope between the battery smart unit termi-

nals specified in the table below, and measure the waveform.

NOTE:

• For the removal and installation procedures related to inspec-

tion of the waveform of the battery smart unit, (See 

HBB-101,

"Removal and Installation"

).

• The frequency of the waveform differs (100 to 900 kHz, 8 to 14

V) depending on operation conditions of the cooling fan of the

hybrid vehicle converter (DC/DC converter).

OK or NG

OK

>> Replace battery smart unit. (See 

HBB-101, "Removal

and Installation"

)

NG

>> GO TO 4.

4.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER CONNECTOR)

See 

HBC-140, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 5.

NG

>> Connect securely.

5.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONVERTER)

CAUTION:

Be sure to wear insulated gloves.

1. Turn ignition switch OFF.

2. Check that the service plug grip is not installed.

3. Disconnect the n4 hybrid vehicle converter (DC/DC converter)

connector (See 

HBB-103, "Removal and Installation"

).

4. Turn ignition switch ON.

5. Measure the voltage according to the value(s) in the table below.

NOTE:

Turn ignition switch ON with the hybrid vehicle converter (DC/

DC converter) connector disconnected causes other DTCs to be stored. Clear the DTCs after performing

this inspection.

OK or NG

OK

>> Replace hybrid vehicle converter. (See 

HBB-103, "Removal and Installation"

).

NG

>> GO TO 6.

Item

Contents

Terminal

IDH (n2-4) - GND (n2-5)

Equipment Setting

2 V/DIV, 2 ms./DIV

Condition

Ignition switch ON

Result:

The waveform appears as shown in the 
illustration.

JMCIA0127GB

Hybrid Vehicle Converter

Ground

Voltage

Harness

connector

Terminal

n4

5 (IDH)

Ground

9 to 14V

JMCIA0128GB

HBC-508

< COMPONENT DIAGNOSIS >

P2519-766

6.

CHECK CONNECTOR CONNECTION CONDITION (BATTERY SMART UNIT CONNECTOR)

CAUTION:

Be sure to wear insulated gloves.

1. Check that the service plug grip is not installed.

2. Check the connection of the battery smart unit connector.

OK or NG

OK

>> GO TO 7.

NG

>> Connect securely.

7.

CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - HYBRID VEHICLE CONVERTER)

CAUTION:

Be sure to wear insulated gloves.

1. Turn ignition switch OFF.

2. Check that the service plug grip is not installed.

3. Disconnect the n2 battery smart unit connector (See 

HBB-101, "Removal and Installation"

).

4. Turn ignition switch ON.

5. Measure the resistance according to the value(s) in the table below.

OK or NG

OK

>> Replace battery smart unit. (See 

HBB-101, "Removal and Installation"

)

NG

>> Repair or replace harness or connector.

OK:

The connector is connected securely and there 
are no contact problems.

Battery Smart Unit

Hybrid Vehicle Converter

(DC/DC Converter)

Resistance

Harness

connector

Terminal

Harness

connector

Terminal

n2

4 (IDH)

n4

5 (IDH)

Below 1

Ω

Battery Smart Unit

Ground

Resistance

Harness connector

Terminal

n2

4 (IDH)

Ground

10 k

Ω or higher

Hybrid Vehicle Converter

(DC/DC Converter)

Ground

Resistance

Harness connector

Terminal

n4

5 (IDH)

Ground

10 k

Ω or higher