P0A84

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A84: Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

DTC P0A84 - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

DESCRIPTION
- Speed of the battery blower assembly is controlled by the HV control ECU. Battery blower assembly power is supplied from the FCTL1 terminal of the HV control ECU by the battery blower relay when it is turned on. The HV control ECU adjusts command signals (S0, S1 and S2) to each battery blower assembly to get the fan speed corresponding to the HV battery temperature. Information of the voltage applied to each battery blower assembly (VM0, VM1 and VM2) is sent to the HV control ECU as a monitor signal via serial communication by the battery smart unit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0A1F IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs Hybrid Battery System.
Result:

B -- GO TO DTC CHART (P0A1F)
A -- Continue to next step.
2. CHECK DTC OUTPUT (HV)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs. Hybrid Battery System

Result:

B -- CHECK FUSE (BATT FAN)
A -- Continue to next step.
3. CHECK BATTERY COOLING BLOWER ASSEMBLY
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Connect Techstream to the DLC3.
(b) Select the following menu items: Powertrain / Hybrid Control / Data List / VMF Fan Motor Voltage 1 to 3 and Temp of Batt TB1 to 8.
HINT: Easier to see the change in the VMF Fan Motor Voltage when displayed in the line chart.
(c) Perform a driving test and check that there is a malfunction in the VMF Fan Motor Voltage 1 while the battery cooling blower No.1 is operating. (*1)
HINT: The fan operates when the battery temperature is approximately 97°F (36°C) or more.

(d) Remove the battery cover and replace the battery cooling blower assembly No.1 with the battery cooling blower assembly No.2 or No.3. Components

(e) Install the battery cover. Components

(f) Select the following menu items: Powertrain / Hybrid Control / Data List / VMF Fan Motor Voltage 1 to 3 and Temp of Batt TB1 to 8.
HINT: Easier to see the change in the VMF Fan Motor Voltage when displayed in the line chart.
(g) Perform a driving test and check that a malfunction in (*1) is reproduced in the battery cooling blower No.2 or No.3.
Standard:
The malfunction is reproduced in another battery cooling blower.
HINT: The battery cooling blower operates when the battery temperature is approximately 97°F (36°C) or more.

YES -- REPLACE BATTERY COOLING BLOWER ASSEMBLY
NO -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Remove the battery cover. Components

(b) Disconnect the 2D connector from the engine room J/B No.2.

(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - BATTERY SMART UNIT)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect the B28 connector from the battery smart unit.

(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.
6. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY (NO.1) - BODY GROUND)
CAUTION: Be sure to wear insulated gloves and protective goggles.

(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY (NO.1) - HV CONTROL ECU)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect the H30 connector from the HV 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):

OK -- INSPECT HV CONTROL ECU
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
8. CHECK FUSE (BATT FAN)

(a) Remove the BATT FAN fuse from the engine room R/B No.4.
(b) Check the continuity of the BATT FAN fuse.
Standard Resistance:
Below 1 Ohms
NG -- CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE)
OK -- Continue to next step.
9. CHECK MODE MONITOR TERMINAL (BATT FAN RELAY)

(a) Preparation
(1) Connect the connector.
(2) Remove the cover of the fusible link block assembly.
(3) Set the vehicle to the following condition.

- Ignition switch ON.
- Headlight dimmer switch LO.
(b) Check voltage
(1) Measure the voltage between the Mode Monitor Terminal and body ground.
Standard Voltage:

C -- CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
B -- INSPECT ENGINE ROOM J/B NO.2 (BATT FAN RELAY)
A -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B NO.2 - MODE MONITOR TERMINAL)

(a) Disconnect the 2G connector from the engine room J/B No.2.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. INSPECT ENGINE ROOM J/B NO.2 (BATT FAN RELAY)
(a) Turn the ignition switch to the OFF position.

(b) Remove the engine room J/B No.2.
(1) Connect the positive battery lead to terminal BFB of the engine room J/B No.2 and the negative lead to terminal SGND, PGND.

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

(3) Connect the battery negative lead to terminal FCTL1 of the engine J/B No.2.

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

NG -- REPLACE ENGINE ROOM J/B NO.2
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE)
(a) Disconnect the 2E connector from the engine room J/B No.2.

(b) Remove the BATT FAN fuse from the engine room R/B No.4.

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Remove the battery cover.
(b) Disconnect the 2D connector from the engine room J/B No.2.

(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - HV CONTROL ECU)
(a) Disconnect the 2G connector from the engine room J/B No.2.

(b) Disconnect the H34 connector from the HV control ECU.

Standard Resistance (Check for short):

OK -- INSPECT HV CONTROL ECU
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
15. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE)
(a) Disconnect the 2E connector from the engine room J/B No.2.

(b) Remove the BATT FAN fuse from the engine room R/B No.4.

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.
HINT: After completing repairs or replacing the defective part, replace the BATT FAN fuse.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
16. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Remove the battery cover. Components

(b) Disconnect the 2D connector from the engine room J/B No.2.

(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

HINT: After completing repairs or replacing the defective part, replace the BATT FAN fuse.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
17. INSPECT BATTERY COOLING BLOWER ASSEMBLY
CAUTION: Be sure to wear insulated gloves and protective goggles.

(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

HINT: After completing repairs or replacing the defective part, replace the BATT FAN fuse.

NG -- REPLACE BATTERY COOLING BLOWER ASSEMBLY
OK -- REPLACE ENGINE ROOM J/B NO.2
18. INSPECT HV CONTROL ECU
HINT: By using the oscilloscope function in Techstream, inspection of the function between the HV control ECU and battery smart unit can be conducted.
(a) Install the battery cover. Components

(b) Using an oscilloscope, measure the waveform according to the condition in the table below.

Standard:

The waveform in the illustration can be measured.
- A and B in the DUTY waveform shown in the illustration vary depending on the cooling fan mode.
- Duty command value is influenced by variance in fan motors and the change of power supply voltage.
- Measure when the vehicle comes to a stop and an idling stop.

NG -- REPLACE HV CONTROL ECU
OK -- REPLACE BATTERY SMART UNIT