P0AD2

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0AD2-123: Hybrid Battery Pack Cooling Fan 3 Control Circuit Low

DTC P0AD2-123 - Hybrid Battery Pack Cooling Fan 3 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 (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 hybrid vehicle 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-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) Read output DTCs Hybrid Battery System.
Result:

B -- GO TO DTC CHART Diagnostic Trouble Code Descriptions (P0A1F-123)
A -- Continue to next step.
2. CHECK DTC OUTPUT (HV)
(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) Read output DTCs.
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 the 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 TB 1 to 8.
HINT: It is easier to see the change in the VMF Fan Motor Voltage when displayed in the line chart.
(c) Perform a road test and check that there is a malfunction in the VMF Fan motor Voltage 3 while the battery cooling blower 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 with another battery cooling blower assembly Components.
(e) Install the battery cover.
(f) Select the following menu items: Powertrain / Hybrid Control / Data List / VMF Fan Motor Voltage 1 to 3 and Temp of BATT TB 1 to 8.
HINT: It is easier to see the change in the VMF Fan Motor Voltage when displayed in the line chart.
(g) Perform a road test and check that a malfunction in (*1) is reproduced in another battery cooling blower assembly.
Result:

HINT: The battery cooling blower operates when the battery temperature is approximately 97°F (36°C) or more.

B -- REPLACE BATTERY COOLING BLOWER ASSEMBLY
A -- 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) Disconnect the O47 battery blower assembly connector.
(b) Remove the BATTERY FAN relay.

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.
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 z18 connector from the battery smart unit 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.
6. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - 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 - HYBRID VEHICLE CONTROL ECU)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect the D36 connector from the hybrid vehicle control ECU 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.
8. INSPECT HYBRID VEHICLE CONTROL ECU
(a) Install the battery cover.

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

Standard:
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.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- REPLACE BATTERY SMART UNIT
9. CHECK FUSE (BATT FAN)
(a) Remove the BATT FAN fuse.

(b) Measure the resistance of the BATT FAN fuse.
:

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

(a) Remove the BATT FAN relay.

(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.
11. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE)

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

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.
12. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect the O47 battery cooling blower assembly connector Components.

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

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 - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the H17 connector from the hybrid vehicle control ECU Components.

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

Standard resistance (Check for short):

(a) Remove the BATT FAN relay from the engine room J/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

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.
15. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect each of the 3 battery blower assembly connectors Components.

(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.
16. 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: Replace the defective battery cooling blower assembly.

NEXT -- Continue to next step.
17. REPLACE BATTERY COOLING BLOWER ASSEMBLY
(a) Replace the defective battery cooling blower assembly Components.
NEXT -- REPLACE FUSE (BATT FAN)
18. REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT -- REPLACE FUSE (BATT FAN)