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Nissan Altima HL32 Hybrid. Manual - part 611

P0A1D-924, P0A1D-925

HBC-193

< COMPONENT DIAGNOSIS >

HBC

P0A1D-924, P0A1D-925

Description

INFOID:0000000004211864

The hybrid vehicle control ECU monitors its internal operation and detects malfunctions.

DTC Logic

INFOID:0000000004211865

DTC DETECTION LOGIC

The hybrid vehicle control ECU performs diagnostic monitoring to verify proper operation of internal ECUsys-

tems. In this diagnostic monitor, the hybrid vehicle control ECU checks the communication bus offcount and

the message register of the CAN (Controller Area Network) controller. If the hybrid vehiclecontrol ECU detects

an error in the communication bus off count or message register, it will conclude thatthere is a malfunction in

the hybrid vehicle control ECU. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC confirmation procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 5 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to

HBC-193, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004211866

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.

REPLACE HYBRID VEHICLE CONTROL ECU

Refer to

HBC-644, "Removal and Installation"

>> INSPECTION END

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A1D

924

Hybrid Powertrain Control Module

ECU internal error is detected.
(Resister value stuck-CAN BUS 1)

Hybrid vehicle control ECU

P0A1D

925

Hybrid Powertrain Control Module

ECU internal error is detected.
(Resister value stuck-CAN BUS 2)

Hybrid vehicle control ECU

HBC-194

< COMPONENT DIAGNOSIS >

P0A1F-129

P0A1F-129

Description

INFOID:0000000004211867

The battery smart unit (battery energy control module) sends HV battery voltage information to the hybrid vehi-

cle control ECU via serial communication.

DTC Logic

INFOID:0000000004211868

DTC DETECTION LOGIC

The hybrid vehicle control ECU calculates the differences among the received HV battery voltage, boost con-

verter voltage, and inverter voltage. If any of the differences exceed prescribed values, the hybrid vehicle con-

trol ECU determines that there is a malfunction in a battery smart unit circuit. When the hybrid vehicle control

ECU detects a malfunction, it will illuminate the MIL and set a DTC.

Diagnosis Procedure

INFOID:0000000004211869

PERFORM COMPONENT FUNCTION CHECK

1. Turn ignition switch ON (READY).

2. Shift the selector lever to N position.

3. Select “PWR RESOURCE” “VB” (HV battery voltage), “VL” (Boost converter voltage), “VH” (Inverter volt-

age) in “” mode with CONSULT-III.

4. Check their indication and calculate the difference and confirm they are within the specified range.

NOTE:

• When the system is normal, the PWR RESOURCE VB, VL and VH values should be almost equal

because voltage boosting will not occur when the shift lever is in N position.

• If the difference between voltage exceeds the specified below, there is a malfunction in the battery smart

unit.

• This check should also be performed after the battery smart unit is replaced.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

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 3.

CHECK DTC OUTPUT (HYBRID SYSTEM)

1. Turn ignition switch ON.

2. Check DTC.

DTC No.

INF Code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A1F

129

Battery Energy Control Module

HV battery voltage circuit mal-
function

Battery smart unit

Inspection voltage

Maximum voltage difference

Difference between PWR RESOURCE VB and VL

50 V

Difference between PWR RESOURCE VB and VH

70 V

Difference between VL and VH

90 V

P0A1F-129

HBC-195

< COMPONENT DIAGNOSIS >

HBC

Is DTC detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

>> Replace battery smart unit (See

HBB-101, "Removal and Installation"

DTC No.

Relevant Diagnosis

P0A60 (all INF codes)

Drive motor “A” Phase V current

P0A63 (all INF codes)

Drive motor “A” Phase W current

P0A72 (all INF codes)

Generator Phase V current

P0A75 (all INF codes)

Generator Phase W current

HBC-196

< COMPONENT DIAGNOSIS >

P0A1F-150, P0A1F-157

P0A1F-150, P0A1F-157

Description

INFOID:0000000004211870

The battery smart unit (battery energy control module) sends HV battery voltage information to the hybrid vehi-

cle control ECU via serial communication.

DTC Logic

INFOID:0000000004211871

DTC DETECTION LOGIC

The hybrid vehicle control ECU calculates the differences among the received HV battery voltage, boost con-

verter voltage, and inverter voltage. If any of the differences exceed prescribed values, the hybrid vehicle con-

trol ECU determines that there is a malfunction in a battery smart unit circuit. When the hybrid vehicle control

ECU detects a malfunction, it will illuminate the MIL and set a DTC.

Diagnosis Procedure

INFOID:0000000004211872

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.

• After completing repairs, restart the system [turn ignition switch ON (READY)] and recheck DTCs (See

HBC-

80, "Diagnosis Description"

>> GO TO 2.

CHECK AUXILIARY BATTERY

1. Measure the voltage between the terminals of the auxiliary battery.

OK or NG

>> GO TO 3.

>> Charge or replace auxiliary battery.

CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

CAUTION:

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"

2. Remove the luggage compartment trim cover front (See

INT-27, "Removal and Installation"

3. Disconnect the frame wire (See

HBC-648, "Removal and Installation"

4. Remove the battery bracket sub-assembly (See

HBB-97, "Removal and Installation"

DTC No.

INF Code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A1F

150

Battery Energy Control Module

Power source voltage of the battery
smart unit is insufficient during pre-
charge.

• Battery smart unit
• Wire harness or connector
• Auxiliary battery
• Fuse (N0. 68)
• IGCT relay

157

Power source voltage of the battery
smart unit is insufficient during dis-
charge.

• Battery smart unit
• Wire harness or connector
• Auxiliary battery
• Fuse (No. 68)
• IGCT relay

11 to 14 V [Battery electrolyte temperature: 20

°C (68°F)]

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