P0A84

HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A84-123: Hybrid Battery Pack Cooling Fan 1

DTC P0A84-123 - Hybrid Battery Pack Cooling Fan 1

DESCRIPTION

The speed of the battery cooling blower assembly is controlled by the hybrid vehicle control ECU in accordance with the HV battery temperature and SOC. Battery cooling blower assembly power is supplied when the FCTL terminal of the hybrid vehicle control ECU turns on the battery blower relay. The hybrid vehicle control ECU sends command signals (SI) to the battery cooling blower assembly to achieve the fan speed that corresponds to the HV battery temperature. Voltage (VM) from the battery cooling blower assembly is used to monitor the operation of the battery cooling blower assembly. It is sent from the battery cooling blower assembly to the hybrid vehicle control ECU via the battery smart unit. Between the battery smart unit and the hybrid vehicle control ECU, serial communication is used.

WIRING DIAGRAM

CAUTION:
- Before inspecting the high-voltage system, 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. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTCS (P0A1F-123 IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:

B -- GO TO DTC CHART (P0A1F-123)
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Active Test / Driving the Battery Cooling Fan.
HINT: Check "Cooling Fan Mode 1" in the data list using the Techstream. If the cooling fan mode is already at 6, it is not necessary to perform the active test.
(d) Select air volume mode 6 in the "Driving the Battery Cooling Fan" active test to operate the battery cooling blower assembly.

(e) Check if the fan operates and air is sucked into the inlet duct of the package tray trim panel assembly.
- The cooling fan may not stop even when the cooling fan is stopped using the "Driving the Battery Cooling Fan" active test. This is due to hybrid control system and is not a malfunction.
- The "Driving the Battery Cooling Fan" active test will stop if there is a problem with the system. However, if there is a problem with the monitor signal (VM) sent from the battery cooling blower assembly to the battery smart unit, the cooling fan will continue to operate in fail-safe mode.

Result:

B -- CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - BATTERY COOLING BLOWER ASSEMBLY)
A -- Continue to next step.
3. CHECK FUSES (BATT FAN AND B-FAN RLY)

(a) Remove the BATT FAN fuse and B-FAN RLY fuse from the luggage room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.
4. CHECK BATTERY COOLING BLOWER ASSEMBLY
(a) Install the BATT FAN fuse and B-FAN RLY fuse.
(b) Turn the power switch on (IG).

HINT:
- For the removal and installation procedures related to the battery cooling blower assembly connector inspection, Components.
- Perform this inspection with the battery cooling blower assembly connector connected.

NG -- INSPECT LUGGAGE ROOM JUNCTION BLOCK (BATT FAN RELAY)
OK -- Continue to next step.
5. CHECK BATTERY COOLING BLOWER ASSEMBLY
(a) Install the BATT FAN fuse and B-FAN RLY fuse.
(b) Connect the battery cooling blower assembly connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Select the following menu items: Powertrain / Hybrid Control / Active Test / Driving the Battery Cooling Fan.
(f) Select cooling fan mode 0 in the "Driving the Battery Cooling Fan" active test to stop the battery cooling blower assembly.

(g) Measure the voltage according to the value(s) in the table below.
Standard voltage:

HINT: Perform this inspection with the battery cooling blower assembly connector connected.

NG -- REPLACE BATTERY COOLING BLOWER ASSEMBLY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the battery cooling blower assembly connector.
(b) Disconnect connector A75 from the hybrid vehicle control ECU.

Standard resistance (Check for short):

(d) Turn the power switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
7. INSPECT LUGGAGE ROOM JUNCTION BLOCK (BATT FAN RELAY)
(a) Remove the luggage room junction block.
(b) Measure the resistance according to the value(s) in the table below.
HINT: The BATT FAN relay is located inside the luggage room junction block.

Standard resistance:

NG -- REPLACE LUGGAGE ROOM JUNCTION BLOCK (BATT FAN RELAY)
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect connector A75 from the hybrid vehicle control ECU.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

NOTICE:
When taking measurements with an electrical tester, do not apply excessive force to the tester probes to avoid damaging the terminals.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM J/B - BATTERY COOLING BLOWER ASSEMBLY)
(a) Disconnect the battery cooling blower assembly connector.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

NOTICE:
When taking measurements with an electrical tester, do not apply excessive force to the tester probes to avoid damaging the terminals.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
10. CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION:
Be sure to wear insulated gloves.
(a) Disconnect connector z36 from the battery smart unit.
HINT: For the removal and installation procedures related to the battery smart unit connector inspection, Components.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. CHECK BATTERY COOLING BLOWER ASSEMBLY
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Active Test / Driving the Battery Cooling Fan.
HINT: Check "Cooling Fan Mode 1" in the data list using the Techstream. If the cooling fan mode is already at 6, it is not necessary to perform the active test.
(d) Select the following menu items: All Data / VMF Fan Motor Voltage 1.
(e) Select each air volume mode (1 to 6) in the "Driving the Battery Cooling Fan" active test to operate the battery cooling blower assembly.

(f) While the cooling fan is operating, compare the value in the data list ("VMF Fan Motor Voltage 1") with the voltage value that was actually measured at the battery cooling blower assembly connector.
OK:

HINT: Perform this inspection with the battery cooling blower assembly connector connected.

NG -- REPLACE BATTERY SMART UNIT
OK -- REPLACE BATTERY COOLING BLOWER ASSEMBLY