Toyota Avalon (XX50): Hybrid/EV Battery Current Sensor for Driving Control Circuit Short to Ground (P1C9F11,P1C9F15). Engine Failed to Start Mechanical Linkage Failure (P1C7779). High Voltage Power Resource Circuit Consump

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Hybrid/EV Battery Current Sensor for Driving Control Circuit Short to Ground (P1C9F11,P1C9F15). Engine Failed to Start Mechanical Linkage Failure (P1C7779). High Voltage Power Resource Circuit Consump

Hybrid/EV Battery Current Sensor for Driving Control Circuit Short to Ground (P1C9F11,P1C9F15)

DESCRIPTION

Refer to the description for DTC P0ABF11.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C9F11

Hybrid/EV Battery Current Sensor for Driving Control Circuit Short to Ground

Value of "Hybrid Battery Current for Driving Control" (IBA) is excessively low.

(1 trip detection logic)

Battery voltage sensor

Comes on

Master Warning Light:

Comes on

P1C9F15

Hybrid/EV Battery Current Sensor for Driving Control Circuit Short to Auxiliary Battery or Open

Value of "Hybrid Battery Current for Driving Control" (IBA) is excessively high.

(1 trip detection logic)

Battery voltage sensor

Comes on

Master Warning Light:

Comes on

IB0 is used for battery control and IBA is used for driving control. Although IB0 and IBA receive voltage output by the battery current sensor through the same terminal, their output may differ as they are connected through separate filter circuits within the battery voltage sensor.

Related Data List

DTC No.

Data List

P1C9F11
  • Hybrid Battery Current for Hybrid Battery Control
  • Hybrid Battery Current for Driving Control

P1C9F15

MONITOR DESCRIPTION

If the value of Data List item Hybrid Battery Current for Driving Control (IBA) is abnormal, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P1CA1 (INF P1C9F11): Hybrid/EV battery pack current sensor circuit malfunction (+B short)

P1CA2 (INF P1C9F15): Hybrid/EV battery pack current sensor circuit malfunction (GND short)

Required sensors/components

Battery current sensor

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Battery voltage sensor

DTC P1CA1 (INF P1C9F11) is not detected

DTC P1CA2 (INF P1C9F15) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 10 seconds or more.[*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

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

(d) Check and record any HV system DTCs and freeze frame data.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P0AFC00, P0AFC96, P308A12, P0ABF11, P0ABF15, P0ABF28 or P0ABF2A is not output.

A

P0AFC00, P0AFC96, P308A12, P0ABF11, P0ABF15, P0ABF28 or P0ABF2A is output.

B

(e) Turn the power switch off.

A

REPLACE BATTERY VOLTAGE SENSOR

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

Engine Failed to Start Mechanical Linkage Failure (P1C7779)

DTC SUMMARY

MALFUNCTION DESCRIPTION

This DTC is stored when the hybrid vehicle control ECU determines that the hybrid transaxle assembly has seized or that there is the hybrid transaxle assembly malfunction in the drivetrain. The cause of this malfunction may be one of the following:

Engine malfunction
  • Seizure due to insufficient engine oil
  • Seizure due to insufficient coolant
  • Damaged engine
Hybrid transaxle malfunction
  • Seizure due to insufficient ATF
  • Damaged hybrid transaxle internal components
  • Damaged transmission input damper assembly

DESCRIPTION

The hybrid vehicle transaxle assembly consists of the planetary gear unit, generator (MG1) and motor (MG2). The planetary gear unit uses a planetary gear to split the engine output into mechanical power and electrical power in accordance with driving requests when the vehicle is being driven or the HV battery is being charged. When accelerating, motor (MG2) assists engine output by increasing vehicle driving force. Motor (MG2) also converts braking energy, which would otherwise be consumed in the form of heat during braking, into electrical energy. This recovered energy is stored in the HV battery. Generator (MG1) supplies power, which is used for charging the HV battery or driving motor (MG2), and also regulates the amount of electricity being generated. In addition, generator (MG1) is used as a starter motor to start the engine.

If the hybrid vehicle control ECU detects that the engine or transaxle gear has seized, the hybrid vehicle control ECU will perform fail-safe control. Also, if a substance or object is preventing the engine or transaxle internal components from rotating, the hybrid vehicle control ECU will perform fail-safe control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C7779

Engine Failed to Start Mechanical Linkage Failure

The engine does not start even though it is being cranked (transaxle input circuit malfunction (engine system))

(1 trip detection logic)
  • Hybrid vehicle transaxle assembly
  • Transmission input damper assembly
  • Engine

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P1C7779
  • Engine Speed
  • Generator Revolution
  • Motor Revolution
  • Target Generator Torque
  • Generator Torque

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Turn the power switch on (READY).
  7. While driving the vehicle at a speed of 20 km/h (12 mph) or more in EV mode, depress the accelerator pedal to start the engine, and drive the vehicle for 3 seconds or more.*1

    *1: When the HV system is normal, the engine starts when the accelerator pedal is depressed halfway or more. If the HV system is malfunctioning, the engine may not start. Even in this case, drive the vehicle at a speed of 20 km/h (12 mph) or more in EV mode for 3 seconds or more.

  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  9. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

CAUTION / NOTICE / HINT

HINT:

If this DTC is output, the engine or gears in the transaxle may have seized. Before performing this inspection, check the engine oil, hybrid transaxle fluid, coolant (for Engine) and coolant (for Inverter) levels.

PROCEDURE

1.

CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

(a) Make sure that the shift lever is in P position.

(b) Lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

OK:

The crankshaft rotates smoothly.

(d) Lower the vehicle.

NG

GO TO STEP 6

OK

2.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Clear the DTCs.

Powertrain > Hybrid Control > Clear DTCs Powertrain > Engine > Clear DTCs

(d) Turn the power switch off.

NEXT

3.

CHECK ENGINE RACING

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Engine Speed, Generator Revolution.

Powertrain > Hybrid Control > Data List

Tester Display

Engine Speed

Generator Revolution

(d) Read the Data List.

(1) While the READY indicator is on, depress the accelerator pedal for 10 seconds.

OK:

"Generator Revolution" is approximately 3.6 times "Engine Speed".

HINT:

  • If the engine does not race and DTC P314779 (Transmission system) is output or generator (MG1) operates but the engine does not crank, replace the hybrid vehicle transaxle assembly.
  • Refer to the graph for Data List confirmation of "Generator Revolution" and "Engine Speed".

Data List

Engine Speed

Generator Revolution

Reference Value

Approximately 1000 rpm

Approximately 3600 rpm

Approximately 1500 rpm

Approximately 5400 rpm

Approximately 2500 rpm

Approximately 9000 rpm

(e) Turn the power switch off.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

4.

CHECK CREEP MOVEMENT

(a) Turn the power switch on (READY).

(b) Depress the brake pedal, move the shift lever to D, and release the brake pedal.

OK:

The wheels turn (the vehicle creeps forward).

(c) Turn the power switch off.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

5.

INSPECT ENGINE SPEED

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Engine Speed, Generator Revolution, Motor Revolution.

Powertrain > Hybrid Control > Data List

Tester Display

Engine Speed

Generator Revolution

Motor Revolution

(d) Read the Data List.

(1) Move the shift lever to D.

(2) Fully depress the accelerator pedal when the vehicle speed is 10 km/h (6 mph) or more.

NOTICE:

Perform this test only in an appropriate safe location, in accordance with all local laws.

(3) Calculate the difference between the value of "Engine Speed" and "(0.28 x Generator Revolution) + (0.19 x Motor Revolution)".

Result

Proceed to

The absolute value of the difference is less than 500 rpm.

A

The absolute value of the difference is 500 rpm or more continuously for 1 second.

B

(e) Turn the power switch off.

A

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

B

REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY

6.

CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

(a) Lift up the vehicle.

(b) Move the shift lever to N.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

OK:

The crankshaft rotates smoothly.

(d) Move the shift lever to P.

(e) Lower the vehicle.

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

REPAIR OR REPLACE ENGINE

High Voltage Power Resource Circuit Consumption Circuit Short (P1C8149,P1C8249)

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects a short circuit malfunction or high-voltage system operation malfunction.

The cause of this malfunction may be one of the following:

Battery current sensor (IB) circuit malfunction
  • Battery current sensor (IB) malfunction
  • Motor generator control ECU (MG ECU) malfunction
  • Communication (wire harness) malfunction
High voltage system malfunction
  • HV battery malfunction
  • HV battery junction block assembly malfunction
  • Inverter with converter assembly malfunction
  • Air conditioner system malfunction
  • High-voltage wire harness malfunction
  • High-voltage connector or connection malfunction
Low-voltage circuit (12 V) malfunction
  • Hybrid vehicle control ECU malfunction
  • Low voltage wire harness malfunction
  • Low voltage connector malfunction

INSPECTION DESCRIPTION

System Diagram Location

Inspection Content

Reason

Inspection Step

*a

Check high-voltage wiring connection condition of the air conditioner compressor with motor assembly

Check for short circuit

2, 4

*b

Check the high voltage cables between the HV battery junction block assembly and inverter with converter assembly.

Check for short circuit

3, 5

DESCRIPTION

Refer to the description for DTC P0AE411.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C8149

High Voltage Power Resource Circuit Consumption Circuit Short

High-voltage circuit malfunctions between the HV battery and inverter with converter assembly.

Excessive overcurrent equal to a short occurs during precharge (time from when SMRP turns on until SMRG turns on).

(1 trip detection logic)
  • Air conditioning wire
  • Compressor with motor assembly
  • Inverter with converter assembly
  • HV battery junction block assembly
  • HV floor under wire

Does not come on

Master Warning Light:

Comes on

P1C8249

High Voltage Power Resource Circuit Over Loading

High-voltage circuit malfunctions between the HV battery and inverter with converter assembly.

Small battery overcurrent occurs during precharge (time from when SMRP turns on until SMRG turns on) and current continues to flow after precharge.

(1 trip detection logic)
  • Air conditioning wire
  • Compressor with motor assembly
  • Inverter with converter assembly
  • HV battery junction block assembly
  • HV floor under wire

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P1C8149
  • Hybrid Battery Voltage
  • Hybrid Battery Current
  • VL-Voltage before Boosting
  • VH-Voltage after Boosting

P1C8249

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (READY) and wait for 30 seconds or more.
  6. Turn the power switch off and wait for 2 minutes or more.
  7. Turn the power switch on (IG) and turn the Techstream on.
  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  9. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AA649.

Click here

CAUTION / NOTICE / HINT

CAUTION:

  • Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
    • Inspecting the high-voltage system
    • Disconnecting the low voltage connector of the inverter with converter assembly
    • Disconnecting the low voltage connector of the HV battery
  • To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
  • After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    HINT:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

    *a

    Without waiting for 10 minutes
  • If this DTC is output, do not turn the power switch on (READY) until the repair has been completed. This DTC means an excessive amperage flow through the system main resistor. The system main resistor may overheat and be damaged if the power switch is turned on (READY) repeatedly before repair.

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

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

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes Powertrain > Motor Generator > Trouble Codes

Result

Proceed to

P1C8149 or P1C8249 only is output, or DTCs except the ones in the tables below are also output.

A

DTCs of hybrid control system in the tables below are output.

B

DTCs of motor generator control system in the tables below are output.

C

Malfunction Content

System

Relevant DTC

Microcomputer malfunction

Hybrid control system

P060647

Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure

P0AFC96

Hybrid/EV Battery Sensor Module Component Internal Failure

P0AFC00

Hybrid/EV Battery Sensor Module

Power source circuit malfunction

Hybrid control system

P0AFC16

Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold

Communication system malfunction

Hybrid control system

U029A87

Lost Communication with Hybrid/EV Battery Sensor Module Missing Message

Sensor and actuator circuit malfunction

Hybrid control system

P0ABF11

Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground

P0ABF15

Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open

P0B3B14

Hybrid/EV Battery Voltage Sensor "A" Circuit Short to Ground or Open

P0B4014

Hybrid/EV Battery Voltage Sensor "B" Circuit Short to Ground or Open

P0B4514

Hybrid/EV Battery Voltage Sensor "C" Circuit Short to Ground or Open

P0B4A14

Hybrid/EV Battery Voltage Sensor "D" Circuit Short to Ground or Open

P0B4F14

Hybrid/EV Battery Voltage Sensor "E" Circuit Short to Ground or Open

P0B5414

Hybrid/EV Battery Voltage Sensor "F" Circuit Short to Ground or Open

P0B5914

Hybrid/EV Battery Voltage Sensor "G" Circuit Short to Ground or Open

P0B5E14

Hybrid/EV Battery Voltage Sensor "H" Circuit Short to Ground or Open

P0B6314

Hybrid/EV Battery Voltage Sensor "I" Circuit Short to Ground or Open

P0B6814

Hybrid/EV Battery Voltage Sensor "J" Circuit Short to Ground or Open

P0B6D14

Hybrid/EV Battery Voltage Sensor "K" Circuit Short to Ground or Open

P0B7214

Hybrid/EV Battery Voltage Sensor "L" Circuit Short to Ground or Open

P308A13

Hybrid/EV Battery Voltage Sensor All Circuit Open

P0AFC62

Hybrid/EV Battery Sensor Module Signal Compare Failure

P0B231C

Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range

P308A12

Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery

P0ABF00

Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance

P0ABF28

Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure

P0ABF2A

Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range

Motor generator control system

P0A1114

DC/DC Converter Enable Circuit Short to Ground or Open

P0A1112

DC/DC Converter Enable Circuit Short to Battery

P1CCC96

DC/DC Converter Enable Component Internal Failure

System malfunction

Motor generator control system

P0D3319

DC/DC Converter Circuit Current Above Threshold

HINT:

  • P1C8149 or P1C8249 may be output as a result of the malfunction indicated by the DTCs above.
    1. The chart above is listed in inspection order of priority.
    2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

C

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)

A

2.

CHECK COMPRESSOR WITH MOTOR ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Disconnect the air conditioning wire connector from the inverter with converter assembly.

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

Standard Resistance:

Tester Connection

(Tester Probe Polarity)

Condition

Specified Condition

T2-2 (ACPE) (Negative (-) probe) - T2-1 (ACPB) (Positive (+) probe)

Power switch off

100 kΩ or higher

NOTICE:

  • Do not use a megohmmeter.
  • Read the resistance after the value has stabilized.
  • Be sure to inspect with connecting the tester probes to the tips of the terminal.

*a

Air conditioning wire

(Inverter with Converter Assembly Side)

*b

Tip of Terminal

(d) Reconnect the air conditioning wire connector.

NG

GO TO STEP 4

OK

3.

CHECK HV FLOOR UNDER WIRE

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Disconnect the HV floor under wire connector from the inverter with converter assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S1-1 (CBI) - S1-2 (CEI)

Power switch off

10 kΩ or higher

NOTICE:

Be sure not to damage or deform the terminal being inspected.

*a

HV Floor Under Wire

(Inverter with Converter Assembly Side)

(d) Reconnect the HV floor under wire connector.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG

GO TO STEP 5

4.

CHECK HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Disconnect the HV air conditioning wire connector from the inverter with converter assembly.

(c) Disconnect the HV air conditioning wire from the compressor with motor assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T2-2 (ACPE) - T2-1 (ACPB)

Power switch off

10 kΩ or higher

NOTICE:

Be sure to inspect with connecting the tester probes to the tips of the terminal.

*a

HV air conditioning wire

(Inverter with Converter Assembly Side)

*b

Tip of Terminal

(e) Reconnect the HV air conditioning wire connector to the inverter with converter assembly.

(f) Reconnect the HV air conditioning wire to the compressor with motor assembly.

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

REPLACE HV AIR CONDITIONING WIRE

5.

CHECK HV FLOOR UNDER WIRE

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Remove the No. 1 HV battery cover panel RH.

Click here

(c) Disconnect the HV floor under wire connectors from the HV battery junction block assembly.

(d) Disconnect the HV floor under wire connector from the inverter with converter assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S1-1 (CBI) - S1-2 (CEI)

Power switch off

10 kΩ or higher

NOTICE:

Be sure not to damage or deform the terminal being inspected.

*a

HV Floor Under Wire

(Inverter with Converter Assembly Side)

(f) Reconnect the HV floor under wire connector to the inverter with converter assembly.

(g) Reconnect the HV floor under wire connectors to the HV battery junction block assembly.

(h) Install the No. 1 HV battery cover panel RH.

OK

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

NG

REPLACE HV FLOOR UNDER WIRE

Motor Shutdown Stuck Off (P1C6A9F). Generator Shutdown Stuck Off (P1C6C9F). Hybrid/EV Battery Current Sensor for Driving Control Voltage Out of Range (P1C9F1C)

High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction (P1C8349)

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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