Part 1

P313 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A84-123: Hybrid Battery Pack Cooling Fan 1 Control Circuit Low
P0A84-123 - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

DESCRIPTION

- The speed of the battery blower assembly is controlled by the hybrid vehicle control ECU. Battery blower assembly power is supplied from the FCTL terminal of the hybrid vehicle control ECU by the battery blower relay when it is turned on. The hybrid vehicle control ECU sends command signals (SI0, SI1 and SI2) 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 hybrid vehicle control ECU as a monitor signal via serial communication by the battery smart unit.









WIRING DIAGRAM





INSPECTION PROCEDURE

CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. 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.
HINT
At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0AFC-123 IS OUTPUT) P0A7F

B -- GO TO DTC P0AFC-123 P0AFC-123
A -- Continue to next step.

2. CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Read output DTCs Hybrid Battery System.

Result





B -- INSPECT FUSE (BATT FAN)
A -- Continue to next step.

3. CHECK BATTERY COOLING BLOWER ASSEMBLY (NO. 0) P0A82

B -- REPLACE BATTERY COOLING BLOWER ASSEMBLY (NO. 0) Removal
A -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY [NO. 0])

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the O45 connector from the battery cooling blower assembly (No. 0).





(e) Remove the BATT FAN relay.





Text in Illustration





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





Standard Resistance:





Text in Illustration





NOTICE:
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.

5. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY [NO. 0] - BATTERY SMART UNIT)

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the O45 connector from the battery cooling blower assembly (No. 0).





(e) Disconnect the z21 connector from the battery smart unit.

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





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE)
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY [NO. 0] - BODY GROUND)

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the O45 connector from the battery cooling blower assembly (No. 0).





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





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY COOLING BLOWER ASSEMBLY [NO. 0])

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the ignition switch ON, unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the O45 connector from the battery cooling blower assembly (No. 0).





(e) Disconnect the A65 connector from the hybrid vehicle control ECU Removal.

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





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

8. CHECK HYBRID VEHICLE CONTROL ECU

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









OK:

The waveform in the illustration can be measured.

HINT
- 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.

Text in Illustration





NG -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

OK -- REPLACE BATTERY SMART UNIT Removal

9. INSPECT FUSE (BATT FAN)

(a) Remove the BATT FAN fuse.





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

Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BODY GROUND)
OK -- Continue to next step.

10. INSPECT RELAY (BATT FAN)

(a) Remove the BATT FAN relay.





Text in Illustration





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





Standard Resistance:





NG -- REPLACE RELAY (BATT FAN)
OK -- Continue to next step.