Hybrid Battery Control (P310): Overview Lexus RX II рестайлинг

DESCRIPTION

The HV control ECU alerts the driver and performs fail safe control based on error signals sent from the battery smart unit.

DTC DETECTION CONDITION CHART

MONITOR DESCRIPTION

If the battery smart unit detects an internal malfunction in the unit itself, the HV control ECU illuminates the MIL and sets a DTC.

The battery smart unit and the HV control ECU calculate the SOC (state of charge) of the HV battery through the accumulated amperage in the HV battery. The battery smart unit sends the condition of the HV battery to the HV control ECU. Then the HV control ECU calculates the SOC (state of charge) based on the information and controls HV battery charge and discharge according to the driving condition.

Scheme 1

DTC DETECTION CONDITION CHART

HINT

P0A7F will not output unless the vehicle is driven for approximately 10 minutes after clearing the DTC.

The battery smart unit calculates the resistance of the HV battery through amperage and voltage, and uses this resistance to determine the extent of deterioration of the HV battery. If the battery smart unit detects that the resistance of the HV battery has exceeded the standard, it determines that a malfunction has occurred. In addition, the battery smart unit monitors the SOC, and if the difference between the maximum and minimum SOC values exceeds the standard, it determines that a malfunction has occurred. When either of the malfunction detection conditions is met, the HV control ECU illuminates the MIL and sets a DTC.

The HV battery uses nickel metal-hydride batteries and does not require external charging. The HV control ECU controls the SOC (state of charge) of the HV battery at a constant level during driving. The HV battery is composed of 30 modules, and each module consists of eight 1.2 V cells in series. The battery smart unit monitors battery block voltage at 15 locations. Each battery block is composed of 2 modules in a set.

Scheme 2

DTC DETECTION CONDITION CHART

HINT

P0A80 will not output unless the vehicle is driven for approximately 10 minutes after clearing the DTC.

The battery smart unit, which monitors the voltage of the battery blocks, determines that a malfunction has occurred if a voltage difference between the battery blocks exceeds the standard. When the malfunction detection condition is satisfied, the HV control ECU illuminates the MIL and sets a DTC.

Refer to the description for DTC P0A84. (See «DTC P0A84 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT LOW; DTC P0A85 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT HIGH» )

DTC DETECTION CONDITION CHART

Scheme 3

1. READ OUTPUT DTC (DTC P0A1F IS OUTPUT) Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES. Read output DTCs. (See «DTC CHECK / CLEAR» ) Result RESULT CHART DTC output Proceed to P0A82 only is output A P0A1F is output B Any of P0A84, P0A85, P0A99, P0A9A, P0AD2, and P0AD3 are output C B: REPLACE BATTERY SMART UNIT C: GO TO «DTC CHART» A: Go to next step
2. CHECK BATTERY COOLING BLOWER ASSY (No.1) CAUTION: Be sure to wear insulated gloves and protective goggles. Connect the intelligent tester to the DLC3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / VMF FAN VOLT 1 to 3 and BATT TEMP 1 to 8. HINT: Easier to see the change in the VMF FAN VOLT when displayed in the line chart. Perform a driving test and check that there is a malfunction in the VMF FAN VOLT 1 while the battery cooling blower No.1 is operating. (*1) HINT: The fan operates when the battery temperature is approximately 36°C (97°F) or more. Remove the battery cover and replace the battery cooling blower assembly No.1 with the battery cooling blower assembly No.2 or No.3. (See «BATTERY BLOWER» ) Install the battery cover. (See «HV BATTERY» ) Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / VMF FAN VOLT 1 to 3 and BATT TEMP 1 to 7. HINT: Easier to see the change in the VMF FAN VOLT when displayed in the line chart. 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 36°C (97°F) or more. YES: REPLACE BATTERY COOLING BLOWER ASSEMBLY NO: REPLACE BATTERY SMART UNIT

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.

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DTC DETECTION CONDITION CHART

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1. READ OUTPUT DTC Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES. Read output DTCs. (See «DTC CHECK / CLEAR» ) Result RESULT CHART DTC output Proceed to Either or both of P0A84 and P0A85 is/are output A 3 or more of P0A84, P0A85, P0A99, P0A9A, P0AD2 and P0AD3 are output B B: GO TO step 7 A: Go to next step
2. CHECK BATTERY COOLING BLOWER ASSEMBLY CAUTION: Be sure to wear insulated gloves and protective goggles. Connect the intelligent tester to the DLC3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / VMF FAN VOLT 1 to 3 and BATT TEMP 1 to 8. HINT: Easier to see the change in the VMF FAN VOLT when displayed in the line chart. Perform a driving test and check that there is a malfunction in the VMF FAN VOLT 1 while the battery cooling blower No.1 is operating. (*1) HINT: The fan operates when the battery temperature is approximately 36°C (97°F) or more. Remove the battery cover and replace the battery cooling blower assembly No.1 with the battery cooling blower assembly No.2 or No.3. (See «BATTERY BLOWER» ) Install the battery cover. (See «HV BATTERY» ) Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / VMF FAN VOLT 1 to 3 and BATT TEMP 1 to 8. HINT: Easier to see the change in the VMF FAN VOLT when displayed in the line chart. 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 36°C (97°F) or more. YES: REPLACE BATTERY COOLING BLOWER ASSEMBLY (NO.1) NO: Go to next step
3. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATTERY COOLING BLOWER ASSEMBLY) CAUTION: Be sure to wear insulated gloves and protective goggles. Remove the battery cover. (Seepage «HV BATTERY» ) Disconnect the 2D connector from the engine room J/B No.2. Disconnect the B26 battery blower assembly (No.1) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine room J/B No.2 (2D-1) - Battery cooling blower assembly (No.1) (B26-1) Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - BATTERY SMART UNIT) CAUTION: Be sure to wear insulated gloves and protective goggles. Disconnect the B28 connector from the battery smart unit. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for open) RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (No.1) (B26-2) - VM0 (B28-3) Below 1 ohms Standard Resistance (Check for short) RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (No.1) (B26-2) - Body ground 10 kohms or more NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY (NO.1) - BODY GROUND) CAUTION: Be sure to wear insulated gloves and protective goggles. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (No.1) (B26-4) - Body ground 10 kohms or more NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY (NO.1) - HV CONTROL ECU) CAUTION: Be sure to wear insulated gloves and protective goggles. Disconnect the H30 connector from the HV control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for open) RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (No.1) (B26-3) - SI0 (H30-15) Below 1 ohms Standard Resistance (Check for short) RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (No.1) (B26-3) - Body ground 10 kohms or more OK: GO TO step 15 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
7. CHECK FUSE (BATT FAN) Remove the BATT FAN fuse from the engine room R/B No.4. Check the continuity of the BATT FAN fuse. Standard Resistance: Below 1 ohms NG: GO TO step 14 OK: Go to next step
8. CHECK MODE MONITOR TERMINAL (BATT FAN RELAY) Preparation Connect the connector. Remove the cover of the fusible link block assembly. Set the vehicle to the following condition. Ignition switch ON. Headlight dimmer switch LO. Check voltage Measure the voltage between the Mode Monitor Terminal and body ground. Standard Voltage VOLTAGE SPECIFICATION Result Proceed to 0 V or Approx. 12 V A Approx. 6.2 V B Approx. 2.0 V C B: GO TO step 10 C: GO TO step 12 A: Go to next step
9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B NO.2 - MODE MONITOR TERMINAL) Disconnect the 2G connector from the engine room J/B No.2. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition 2G-5 - Mode monitor terminal Always Below 1 ohms 2G-5 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. INSPECT ENGINE ROOM J/B NO.2 (BATT FAN RELAY) Turn the ignition switch to the OFF position. Remove the engine room J/B No.2. Connect the positive battery lead to terminal BFB of the engine room J/B No.2 and the negative lead to terminal SGND, PGND. TERMINAL CONNECTION REFERENCE Symbols (terminals No.) Connection BFB (2E-2) - SGND (2N-13) and PGND (2F-1) Positive - Negative Measure the voltage according to the value(s) in the table below. Standard Voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition BFL (2D-1) - Battery negative terminal Below 1 V Connect the battery negative lead to terminal FCTL1 of the engine J/B No.2. TERMINAL CONNECTION REFERENCE Symbols (terminals No.) Connection FCTL (2G-6) Negative Measure the voltage according to the value(s) in the table below. Standard Voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition BFL (2D-1) - Battery negative terminal 10 to 14 V NG: REPLACE ENGINE ROOM J/B NO.2 OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE) Disconnect the 2E connector from the engine room J/B No.2. Remove the BATT FAN fuse from the engine room R/B No.4. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2E-2) - Engine Room R/B No.4 BATT FAN fuse terminal 2. Below 1 ohms 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: Go 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. Remove the battery cover. Disconnect the 2D connector from the engine room J/B No.2. Disconnect each of the 3 battery cooling blower assembly (No.1, No.2 and No.3) connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2D-1) - Battery cooling blower (1) Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - HV CONTROL ECU) Disconnect the 2G connector from the engine room J/B No.2. Disconnect the H34 connector from the HV control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for open) RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2G-6) - FCTL (H34-9) Below 1 ohms Standard Resistance (Check for short) RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2G-6) - Body ground 10 kohms or higher OK: GO TO step 17 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
14. CHECK HARNESS AND CONNECTOR (BATT FAN RELAY - BATT FAN FUSE) Disconnect the 2E connector from the engine room J/B No.2. Remove the BATT FAN fuse from the engine room R/B No.4. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2E-2) - Body ground 10 kohms or higher 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: Go 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. Remove the battery cover. (See «HV BATTERY» ) Disconnect the 2D connector from the engine room J/B No.2. Disconnect each of the 3 battery blower assembly (No. 1, No.2 and No.3) connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Engine Room J/B No.2 (2D-1) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
16. INSPECT BATTERY COOLING BLOWER ASSEMBLY CAUTION: Be sure to wear insulated gloves and protective goggles. Measure the resistance according to the value(s) in the table below. Standard Resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Battery cooling blower assembly (1) - Body ground 10 kohms or higher NG: REPLACE BATTERY COOLING BLOWER ASSEMBLY (NO.1) OK: REPLACE ENGINE ROOM J/B NO.2
17. INSPECT HYBRID VEHICLE CONTROL ECU HINT: By using the oscilloscope function in the intelligent tester, inspection of the function between the HV control ECU and battery smart unit can be conducted. Install the battery cover. (See «HV BATTERY» ) Using an oscilloscope, measure the waveform according to the condition in the table below. WAVEFORM REFERENCE Item Contents Terminal SI0 (H30-15) - E01 (H32-7) Equipment Setting 1V/DIV, 50 μs/DIV Condition Ignition switch ON or READY-on state 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

DTC DETECTION CONDITION CHART

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Refer to the description for DTC P0A84. (See «DTC P0A84 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT LOW; DTC P0A85 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT HIGH» )

DTC DETECTION CONDITION CHART

Refer to the description for DTC P0A84. (See «DTC P0A84 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT LOW; DTC P0A85 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT HIGH» )

DTC DETECTION CONDITION CHART

The battery temperature sensors are provided at 8 locations on the bottom of the HV battery. The resistance of the thermistor, which is built into each battery temperature sensor, varies in accordance with changes in the HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery smart unit uses the battery temperature sensor to detect the HV battery temperature, and sends the detected value to the HV control ECU. Based on the results of this detection, the HV control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises to a predetermined level.)

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DTC DETECTION CONDITION CHART

HINT

After confirming that a DTC is output, use the intelligent tester to check "BATT TEMPI to 8" in the HV system ECU data list.

TEMPERATURE SPECIFICATION

If the temperature indicated by the battery temperature sensor is lower than the standard level (open circuit), or is higher than the standard level (short circuit), the battery smart unit interprets this as a sensor malfunction. If the battery smart unit detects that HV battery temperature is out of normal range, the HV control ECU illuminates the MIL and sets a DTC.

The battery current sensor, which is mounted on the positive cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery smart unit inputs a voltage, which varies between 0 and 5 V in proportion to the amperage, into the IB terminal from the battery current sensor. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery is being charged, and above 2.5 V indicates that the HV battery is being discharged. The HV control ECU determines the charging and discharging amperage of the HV battery based on the signals that are input to its IB terminal from the battery smart unit, and calculates the SOC (state of charge) of the HV battery through the accumulated amperage.

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DTC DETECTION CONDITION CHART

If the battery smart unit detects a malfunction in the battery current sensor, the HV control ECU illuminates the MIL and sets a DTC.

The battery current sensor, which is mounted on the positive cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery smart unit inputs a voltage, which varies between 0 and 5 V in proportion to the amperage, into the IB terminal from the battery current sensor. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery is being charged, and above 2.5 V indicates that the HV battery is being discharged. The HV control ECU determines the charging and discharging amperage of the HV battery based on the signals that are input to its IB terminal from the battery smart unit, and calculates the SOC (state of charge) of the HV battery through the accumulated amperage.

DTC DETECTION CONDITION CHART

If the battery smart unit detects a malfunction in the battery current sensor, the HV control ECU illuminates the MIL and sets a DTC.

Refer to the wiring diagram for DTC P0A84. (See «DTC P0A84 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT LOW; DTC P0A85 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT HIGH» )

DTC DETECTION CONDITION CHART

Refer to description to DTC P0A84. (See «DTC P0A84 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT LOW; DTC P0A85 HYBRID BATTERY PACK COOLING FAN 1 CONTROL CIRCUIT HIGH» )

DTC DETECTION CONDITION CHART

The HV control ECU detects error signals, alerts the driver, and performs fail-safe control based on the detected signals.

This DTC is output if the HV battery is discharged, the HV control system has a malfunction, or the shift lever is left in the N position.

DTC DETECTION CONDITION CHART

If the battery smart unit detects voltage drop in the HV battery, the HV control ECU illuminates the MIL and sets a DTC.

Refer to the wiring diagram for DTC P0A80. (See «DTC P0A80 REPLACE HYBRID BATTERY PACK» )

DTC DETECTION CONDITION CHART

HINT

P3011 and P3025 will not output unless the vehicle is driven for approximately 10 minutes after clearing the DTCs.

If there is an abnormal internal resistance or electromotive voltage in the battery blocks, the battery smart unit determines that a malfunction has occurred. When the malfunction detection condition is satisfied, the HV control ECU illuminates the MIL and sets a DTC.

Refer to the description for DTC P0A80. (See «DTC P0A80 REPLACE HYBRID BATTERY PACK» )

DTC DETECTION CONDITION CHART

The battery smart unit monitors a voltage of the battery blocks to detect an open in internal battery voltage sensor circuits of the battery smart unit and the wire harness between each battery block and battery smart unit. If the voltage at any of the battery blocks is out of the specified range, the battery smart unit judges that there is an open in the internal sensor circuit(s) or wire harness. The HV control ECU then illuminates the MIL and sets a DTC.

The battery smart unit detects the HV battery conditions (voltage, current, and temperature) and the battery cooling fan voltage, and sends the detected signals to the HV control ECU via the serial communication system.

DTC DETECTION CONDITION CHART

If a malfunction in communication line between the battery smart unit and HV control ECU is detected, the HV control ECU illuminates the MIL and sets a DTC.

See also:
• MIL Circuit
• INFORMATION / FREEZE FRAME DATA