P0A81

P112 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A81: Hybrid Battery Pack Cooling Fan 1

DTC P0A81 - Hybrid Battery Pack Cooling Fan 1

DESCRIPTION

The blower motor controller regulates the voltage of the battery blower. The blower motor controller has fins made of aluminum. The exhaust air from the HV battery assembly that flows through the quarter vent duct cools the blower motor controller, which is installed in the quarter vent duct.
The current flows from the FCTL1 terminal of the battery ECU to the relay coil of the No. 1 battery blower relay and as the contact point of the relay closes, the power is supplied to the battery blower.
When a fan actuation signal is transmitted from the battery ECU, the blower motor controller adjusts voltage (VM) which is applied to the battery blower in order to get the requested fan speed. The adjusted voltage is also transmitted to the VM terminal of the battery ECU in the form of a monitoring signal. The blower motor controller corrects the voltage at the blower motor by monitoring voltage at the +B terminal of the battery blower.










WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ DTC OUTPUT (DTC P0A1F IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG) and the tester ON.
(c) Enter the following menus: Powertrain / HV Battery / DTC.
(d) Read DTCs.
Result:






C -- GO TO DTC P0A84 CHART
B -- REPLACE BATTERY ECU
A -- Continue to next step.

2. REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)
(a) Replace the quarter vent duct (blower motor controller).
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch ON (IG) and the tester ON.
(d) Enter the following menus: Powertrain / HV Battery / DTC.
(e) Clear the DTCs and freeze frame data.
(f) Perform a simulation test.
NEXT -- Continue to next step.

3. READ DTC OUTPUT (DTC P0A81 IS OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG) and the tester ON.
(c) Enter the following menus: Powertrain / HV Battery / DTC.
(d) Read DTCs.
Result:
DTC P0A81 is output again
YES -- REPLACE BATTERY ECU
NO -- SYSTEM IS OK