Toyota Avalon (XX50): Problem Symptoms Table. Shift Paddle Switch Circuit. Shut Down Signal Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Problem Symptoms Table. Shift Paddle Switch Circuit. Shut Down Signal Circuit

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

Hybrid Control System

Symptom	Suspected Area	Link
Cannot enter EV drive mode	CAN Communication System
	Pattern Select Switch EV Mode Circuit
	EV drive mode switch (Electric parking brake switch assembly)
	Combination meter assembly
EV mode indicator light does not illuminate	Combination meter assembly
	EV drive mode switch (Electric parking brake switch assembly)
	Pattern Select Switch EV Mode Circuit
EV mode indicator light does not turn off	Combination meter assembly
	EV drive mode switch (Electric parking brake switch assembly)
	Pattern Select Switch EV Mode Circuit
Cannot enter ECO mode	CAN Communication System
	ECO mode switch (Electric parking brake switch assembly)
	Pattern Select Switch ECO Mode Circuit
	Combination meter assembly
ECO mode indicator light does not illuminate	ECO mode switch (Electric parking brake switch assembly)
	Pattern Select Switch ECO Mode Circuit
	Combination meter assembly
ECO mode indicator light does not turn off	ECO mode switch (Electric parking brake switch assembly)
	Pattern Select Switch ECO Mode Circuit
	Combination meter assembly
Cannot enter SPORT mode	CAN Communication System
	SPORT mode switch (Electric parking brake switch assembly)
	Pattern Select Switch SPORT Mode Circuit
	Combination meter assembly
SPORT mode indicator light does not illuminate	SPORT mode switch (Electric parking brake switch assembly)
	Pattern Select Switch SPORT Mode Circuit
	Combination meter assembly
SPORT mode indicator light does not turn off	SPORT mode switch (Electric parking brake switch assembly)
	Pattern Select Switch SPORT Mode Circuit
	Combination meter assembly
Hunting (Poor idle)	Check for Diagnosis Related Information*3
Hunting (Poor idle)	Drive Start Control
Hesitation and/or poor acceleration	Check for Diagnosis Related Information*3
	Brake Override System
	Drive Start Control
Shift range position cannot be changed by shifting to "+" or "-"	Transmission Control Switch Circuit
	Shift Paddle Switch Circuit
Shift position indicator is malfunctioning	Indicator Circuit
Power switch does not turn on (READY).	Check Vehicle Control History (wrong assembly confirmation)*1
	Smart Key System (for start function)
	ECU Power Source Circuit (Hybrid control system)
	Hybrid vehicle control ECU
	ECM
Loud rattle from hybrid vehicle transaxle	Check idle learning
	Transmission input damper assembly
	Hybrid vehicle transaxle assembly
	Engine misfire	-
"Maintenance Required for Traction Battery Cooling Parts See Owner's Manual" is displayed on the multi-information display. *2	1. Make sure the HV battery cooling system intake port is not blocked.	-
	2. Make sure there are no gaps between the connecting parts of the ducts.	-
	3. Clean the No. 1 hybrid battery intake filter. Check for entry of foreign matter.
	4. Clear the DTCs to reset the learning values even if no DTCs are stored.
Abnormal sound is heard from the area around the No. 1 hybrid battery intake duct.	1. Make sure the HV battery cooling system intake port is not blocked.	-
	2. Make sure there are no gaps between the connecting parts of the ducts.	-
	3. Clean the No. 1 hybrid battery intake filter. Check for entry of foreign matter.
	4. Clear the DTCs to reset the learning values even if no DTCs are stored.
Engine stops and starts less frequently.	Check Vehicle Control History (Limit to Charge / Discharge Control Value by Hybrid Battery Temperature High)
Engine speed returns to idle slowly after accelerator pedal is fully released.	Check Vehicle Control History (Limit to Charge / Discharge Control Value by Hybrid Battery Temperature High)

*1: Check Vehicle Control History (wrong assembly confirmation)

Using the Techstream, check the vehicle control history.
Click here

HINT:

If "Hybrid Battery Pack Sensor Module Mismatch" is displayed, the wrong type of battery voltage sensor is installed.
If the battery voltage sensor had been replaced just before the malfunction occurred, check the part number of the battery voltage sensor.
HINT:
- The type of battery voltage sensor to be used varies depending on the vehicle model.
- If the wrong type of battery voltage sensor is installed, the power switch cannot be turned on (READY).
After installing the battery voltage sensor, perform the following to check that the power switch can be turned on (READY).
1. Turn the power switch on (READY).
2. Turn the power switch off and wait for 2 minutes or more.
3. Turn the power switch on (READY) again.

*2: If the battery cooling blower assembly malfunctions, DTC P0A8100, P0A8111, P0A8115, P0A814B, P0A8196 or P0A8198 will be stored. If only "Maintenance Required for Traction Battery Cooling Parts See Owner's Manual" is displayed on the multi-information display, only perform the inspection of the HV battery cooling system intake port, filter and duct.

*3: If any of the following Diagnosis Related Information items are output, perform troubleshooting for the corresponding DTCs.

Result

Result		Link
Hybrid control system	P312387
Motor generator control system	P31241F
Motor generator control system	P312487

Shift Paddle Switch Circuit

DESCRIPTION

Moving the shift lever to S enables the shift range to be selected. The shift range can be selected by operating the "+" or "-" shift paddle switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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.	READ VALUE USING TECHSTREAM (SPORTS SHIFT UP SIGNAL, SPORTS SHIFT DOWN SIGNAL)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Sports Shift UP Signal, Sports Shift DOWN Signal.

Powertrain > Hybrid Control > Data List

Tester Display
Sports Shift UP Signal
Sports Shift DOWN Signal

(d) Read the values displayed on the Techstream.

Powertrain > Hybrid Control > Data List

Tester Display	Measurement Item	Range	Normal Condition
Sports Shift UP Signal	Sport shift up switch status	ON or OFF	Shift paddle switch RH (+) operated: ON Shift paddle switch RH (+) not operated: OFF
Sports Shift DOWN Signal	Sport shift down switch status	ON or OFF	Shift paddle switch LH (-) operated: ON Shift paddle switch LH (-) not operated: OFF

Tester Display

Measurement Item

Range

Normal Condition

Sports Shift UP Signal

Sport shift up switch status

ON or OFF

Shift paddle switch RH (+) operated: ON

Shift paddle switch RH (+) not operated: OFF

Sports Shift DOWN Signal

Sport shift down switch status

ON or OFF

Shift paddle switch LH (-) operated: ON

Shift paddle switch LH (-) not operated: OFF

Result	Proceed to
The Techstream display changes according to the shift paddle switch (transmission shift switch assembly) operation	A
The Techstream display does not change according to the shift paddle switch (transmission shift switch assembly) operation	B

(e) Turn the power switch off.

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK HARNESS AND CONNECTOR (SHIFT PADDLE SWITCH CIRCUIT)

(a) Disconnect the G47 hybrid vehicle control ECU connector.

(b) Disconnect the G22 transmission control switch (shift lock control unit assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-9 (SFTU) - Body ground	Shift paddle switch RH (+) operated	3 Ω or less
G47-8 (SFTD) - Body ground	Shift paddle switch LH (-) operated	3 Ω or less
G47-9 (SFTU) - Body ground	Shift paddle switch RH (+) not operated	10 kΩ or higher
G47-8 (SFTD) - Body ground	Shift paddle switch LH (-) not operated	10 kΩ or higher

*a	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

(d) Reconnect the G22 transmission control switch (shift lock control unit assembly) connector.

(e) Reconnect the G47 hybrid vehicle control ECU connector.

REPLACE HYBRID VEHICLE CONTROL ECU

3.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

(a) Disconnect the G17 spiral cable sub-assembly connector.

*a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

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

Standard Resistance (Open):

Tester Connection	Condition	Specified Condition
G17-2 (ECC) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the G47 hybrid vehicle control ECU connector.

(b) Disconnect the G17 spiral cable sub-assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-9 (SFTU) - G17-8 (SUP)	Always	Below 1 Ω
G47-8 (SFTD) - G17-1 (SDN)	Always	Below 1 Ω
G47-9 (SFTU) or G17-8 (SUP) - Body ground	Always	10 kΩ or higher
G47-8 (SFTD) or G17-1 (SDN)- Body ground	Always	10 kΩ or higher

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

(d) Reconnect the G17 spiral cable sub-assembly connector.

(e) Reconnect the G47 hybrid vehicle control ECU connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Inspect the spiral cable sub-assembly.

Click here

REPLACE SPIRAL CABLE SUB-ASSEMBLY

6.	INSPECT SHIFT PADDLE SWITCH LH (NO. 1 TRANSMISSION SHIFT SWITCH ASSEMBLY)

(a) Inspect the shift paddle switch LH (NO. 1 transmission shift switch assembly).

Click here

REPLACE SHIFT PADDLE SWITCH LH (NO. 1 TRANSMISSION SHIFT SWITCH ASSEMBLY)

7.	INSPECT SHIFT PADDLE SWITCH RH (NO. 2 TRANSMISSION SHIFT SWITCH ASSEMBLY)

(a) Inspect the shift paddle switch RH (NO. 2 transmission shift switch assembly).

Click here

REPLACE SHIFT PADDLE SWITCH RH (NO. 2 TRANSMISSION SHIFT SWITCH ASSEMBLY)

8.	INSPECT NO. 1 SWITCH WIRE

(a) Disconnect the z2 No. 1 switch wire connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z2-2 (SUP) - z2-3 (ECC)	"+" (Up shift) shift paddle switch operated and held	Below 1 Ω
z2-2 (SUP) - z2-3 (ECC)	"+" (Up shift) shift paddle switch not operated	10 kΩ or higher
z2-4 (SDN) - z2-3 (ECC)	"-" (Down shift) shift paddle switch operated and held	Below 1 Ω
z2-4 (SDN) - z2-3 (ECC)	"-" (Down shift) shift paddle switch not operated	10 kΩ or higher

*a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

CHECK FOR INTERMITTENT PROBLEMS

REPLACE NO. 1 SWITCH WIRE

Shut Down Signal Circuit

DESCRIPTION

The cause of the malfunction may be a shutdown signal.

Check whether there is a shutdown signal +B short circuit.

Related Parts Check

Area	Inspection
HSDN terminal	Check that the HSDN terminal voltage decreases to check for an open or short circuit while READY off (IG ON).
Hybrid vehicle control ECU, inverter, wire harness	Check for open or short circuit in hybrid vehicle control ECU, inverter and wire harness.

SYSTEM DESCRIPTION

Power supply to the motor is cut off due to a shutdown signal sent from the hybrid vehicle control ECU to the motor generator control ECU (MG ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

This diagnostic procedure is referenced to in the diagnostic procedure of several DTCs.

If the result of this diagnostic procedure is normal, proceed as directed in the procedure for the DTC.

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.

*a

Without waiting for 10 minutes

Click here

HINT:

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

NOTICE:

Click here

PROCEDURE

1.	CHECK HYBRID VEHICLE CONTROL ECU

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A24-12 (HSDN) - G46-6 (E1)	Power switch on (IG)	Below 4.5 V

*a	Component with harness connected (Hybrid Vehicle Control ECU)

SHUTDOWN SIGNAL CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC)

2.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER 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 A42 inverter with converter assembly connector.

(d) Connect the cable to the negative (-) auxiliary battery terminal.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-22 (HSDN) or A24-12 (HSDN) - Body ground	Power switch on (IG)	Below 1 V

NOTICE:

Turning the power switch on (IG) with the hybrid vehicle control ECU and inverter with converter assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Front view of wire harness connector

(to Inverter with Converter Assembly)

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for 2 minutes or more.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-22 (HSDN) - A42-6 (+B)	Power switch off	10 kΩ or higher
A42-22 (HSDN) - A42-5 (+B2)	Power switch off	10 kΩ or higher
A24-12 (HSDN) - A24-4 (+B1)	Power switch off	10 kΩ or higher
A24-12 (HSDN) - A24-6 (MREL)	Power switch off	10 kΩ or higher

(j) Reconnect the A24 hybrid vehicle control ECU connector.

(k) Reconnect the A42 inverter with converter assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK INVERTER WITH CONVERTER 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 A42 inverter with converter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-22 (HSDN) - A42-6 (+B)	Power switch off	10 kΩ or higher
A42-22 (HSDN) - A42-5 (+B2)	Power switch off	10 kΩ or higher

*a	Component without harness connected (Inverter with Converter Assembly)

(d) Reconnect the A42 inverter with converter assembly connector.

REPLACE HYBRID VEHICLE CONTROL ECU

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Pattern Select Switch EV Mode Circuit. Pattern Select Switch Sport Mode Circuit. Precaution

System Diagram. Terminals Of Ecu. Transmission Control Switch Circuit

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