Toyota Avalon (XX50): System Diagram. Tachometer Malfunction. Terminals Of Ecu

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System(for Hv Model) / System Diagram. Tachometer Malfunction. Terminals Of Ecu

System Diagram

SYSTEM DIAGRAM

HINT:

Refer to System Diagram of CAN Communication System.

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COMBINATION METER ASSEMBLY DIAGRAM

TURN SIGNAL LIGHT DIAGRAM

(a) LH Side

(b) RH Side

ILLUMINATION DIAGRAM

SPEED SIGNAL DIAGRAM

Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine rpm data signal from the hybrid vehicle control ECU via CAN communication. The combination meter assembly displays the engine speed calculated based on the data received from the hybrid vehicle control ECU.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
Before replacing the hybrid vehicle control ECU, refer to Registration.
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PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

Click here

Result	Proceed to
CAN communication DTCs are not output	A
CAN communication DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check if hybrid control system DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO HYBRID CONTROL SYSTEM

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Hybrid Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Hybrid Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Engine Speed	Engine speed	-	Engine stopped: 0 rpm While engine running at a constant speed: No significant fluctuation	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

Engine stopped:

0 rpm

While engine running at a constant speed:

No significant fluctuation

Powertrain > Hybrid Control > Data List

Tester Display
Engine Speed

OK:

Engine speed displayed on the Techstream is almost the same as the tachometer indication.

USE SIMULATION METHOD TO CHECK

REPLACE COMBINATION METER ASSEMBLY

Terminals Of Ecu

TERMINALS OF ECU

COMBINATION METER ASSEMBLY

(a) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Signal Input/Output	Condition	Specified Condition
G16-1 (ILL-) - Body ground	LA-L - Body ground	Illumination signal	Output	Taillights off → Taillights on	Below 1 V → Pulse generation
G16-2 (EP) - Body ground	W-B - Body ground	Ground	-	Always	Below 1 Ω
G16-4 (INT) - Body ground	L - Body ground	Tire pressure warning ECU and receiver signal	Output	Power switch on (IG) Steering pad switch assembly operated, "TPWS" selected on the multi-information display and "OK" switch (steering pad switch assembly) pressed and held → "OK" switch (steering pad switch assembly) off	Below 1.5 V → 8 to 15 V
G16-5 (SI) - Body ground	W - Body ground	Speed signal for other systems (Input)	Input	Power switch on (IG), wheel being rotated	Pulse generation (See waveform 1)
G16-6 (+S) - Body ground	L - Body ground	Speed signal for other systems (Output)	Output	Power switch on (IG), wheel being rotated	Pulse generation (See waveform 1)
G16-8 (IND) - Body ground	B - Body ground	Vehicle proximity notification system warning signal	Input	Approximately 3 seconds after turning power switch on (IG)	Below 1 V
G16-14 (FR) - G16-33 (FE)	LG - BE	Fuel level signal	Input	Power switch on (IG), fuel level full → Fuel level low (fuel level warning light on)	Pulse generation (See waveform 2)
G16-15 (FV) - Body ground	GR - Body ground	Fuel sender gauge (Power source)	-	Power switch on (IG)	Pulse generation (See waveform 3)
G16-17 (WLVL) - Body ground	LG - Body ground	Washer fluid level signal	Input	Power switch on (IG), washer fluid level not low → Washer fluid level low	11 to 14 V → Below 1 V
G16-18 (RLMT) -Body ground	BE - Body ground	Rear seat belt warning light LH signal	Output	Power switch on (IG), rear seat belt warning light LH (radio and display receiver assembly) off → Rear seat belt warning light LH (radio and display receiver assembly) on	11 to 14 V → Below 1 V
G16-19 (RCMT) -Body ground	R - Body ground	Rear seat belt warning light center signal	Output	Power switch on (IG), rear seat belt warning light center (radio and display receiver assembly) off → Rear seat belt warning light center (radio and display receiver assembly) on	11 to 14 V → Below 1 V
G16-20 (RRMT) -Body ground	G - Body ground	Rear seat belt warning light RH signal	Output	Power switch on (IG), rear seat belt warning light RH (radio and display receiver assembly) off → Rear seat belt warning light RH (radio and display receiver assembly) on	11 to 14 V → Below 1 V
G16-21 (ES) - Body ground	W-B - Body ground	Ground	-	Always	Below 1 Ω
G16-24 (RLSB) - Body ground	SB - Body ground	Rear seat belt buckle switch LH signal	Input	Power switch on (IG), rear seat belt LH unfastened → Fastened	Below 1 V → 11 to 14 V
G16-25 (RCSB) - Body ground	B - Body ground	Rear seat belt buckle switch center signal	Input	Power switch on (IG), rear seat belt center unfastened → Fastened	Below 1 V → 11 to 14 V
G16-26 (RRSB) - Body ground	LG - Body ground	Rear seat belt buckle switch RH signal	Input	Power switch on (IG), rear seat belt RH unfastened → Fastened	Below 1 V → 11 to 14 V
G16-27 (OILW) - Body ground	W - Body ground	Engine oil level signal	Input	Power switch on (IG), engine oil level not low → Engine oil level low	Below 1 V → 11 to 14 V
G16-28 (MSM+) - Body ground	GR - Body ground	Steering pad switch assembly signal	Input	Power switch on (IG), up, down, right and left switches on steering pad switch assembly not pushed	4.8 to 5.2 V
G16-29 (MSTI) - Body ground	R - Body ground	Steering pad switch assembly signal	Input	Power switch on (IG), OK and back switches on steering pad switch assembly not pushed	4.8 to 5.2 V
G16-31 (CANL)	W	CAN communication line	Input/Output	-	-
G16-32 (CANH)	B	CAN communication line	Input/Output	-	-
G16-34 (LST1) - Body ground	L - Body ground	Fuel lid operation signal	Input	"Ready to Refuel" displayed on multi-information display	Pulse generation (See waveform 4)
				"Close Fuel Lid" displayed on multi-information display	Pulse generation (See waveform 5)
				Power switch on (IG)	11 to 14 V
G16-36 (TX+)	G	Local bus communication line	Input/Output	-	-
G16-37 (TX-)	W	Local bus communication line	Input/Output	-	-
G16-39 (IG+) - Body ground	GR - Body ground	Power switch signal	-	Power switch off → Power switch on (IG)	Below 1 V → 11 to 14 V
G16-40 (B) - Body ground	LA-B - Body ground	Auxiliary battery	-	Power switch off	11 to 14 V
G15-1 (ODO) - Body ground	LA-L - Body ground	ODO/TRIP switch signal	Input	Power switch on (IG), ODO/TRIP switch (trip switch) not pushed	4.8 to 5.2 V
G15-2 (TR) - Body ground	L - Body ground	Light control rheostat switch signal	Input	Power switch on (IG), light control rheostat up switch (trip switch) and light control rheostat down switch (trip switch) not pushed	4.8 to 5.2 V
G15-3 (HAZ) - Body ground	LA-R - Body ground	Hazard warning switch signal	Input	Hazard warning switch assembly (radio and display receiver assembly) off → Hazard warning switch assembly (radio and display receiver assembly) pushed	11 to 14 V → Below 1 V
G15-5 (SW3) - Body ground	LA-B - Body ground	Ground for trip switch	-	Always	Below 1 Ω
G15-7 (LR) - Body ground	LA-G - Body ground	Front turn signal light RH signal	Output	Power switch on (IG), RH turn indicator light off → RH turn indicator light blinking	Below 1 V → 11 to 14 V ←→ Below 1 V
G15-8 (B) - Body ground	LA-B - Body ground	Auxiliary battery	-	Power switch off	11 to 14 V
G15-10 (TRNL) - Body ground	BE - Body ground	Rear turn signal light LH signal	Output	Power switch on (IG), LH turn indicator light off → LH turn indicator light blinking	Below 1 V → 11 to 14 V ←→ Below 1 V
G15-11 (LL) - Body ground	LA-LG - Body ground	Front turn signal light LH signal	Output	Power switch on (IG), LH turn indicator light off → LH turn indicator light blinking	Below 1 V → 11 to 14 V ←→ Below 1 V
G15-13 (TRNR) - Body ground	BE - Body ground	Rear turn signal light RH signal	Output	Power switch on (IG), RH turn indicator light off → RH turn indicator light blinking	Below 1 V → 11 to 14 V ←→ Below 1 V

Waveform 1:

Item	Condition
Tester connection	G16-5 (SI) - Body ground G16-6 (+S) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG), wheel being rotated

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

Waveform 2:

Item	Condition
Tester connection	G16-14 (FR) - G16-33 (FE)
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG), fuel level full → low (fuel level warning light on)

HINT:

(A) will depending on the fuel level.
Power switch on (IG), fuel level full → Fuel level low (fuel level warning light on) (4.2 to 4.6 → 0.3 to 1.2 V)

Waveform 3:

Item	Condition
Tester connection	G16-15 (FV) - Body ground
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG)

HINT:

Power switch on (IG) (4.5 to 5.5 V)

Waveform 4:

Item	Condition
Tester Connection	G16-34 (LST1) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	"Ready to Refuel" displayed on multi-information display

Waveform 5:

Item	Condition
Tester Connection	G16-34 (LST1) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	"Close Fuel Lid" displayed on multi-information display

HINT:

This waveform is output when the fuel lid opener switch is operated if the fuel lid is open and any of the following conditions are met:

The vehicle has been driven for 1 km (0.6 mile) or more at a speed of 50 km/h (31 mph) or more.
30 minutes or more have elapsed since the fuel lid opener switch was operated.

System Description

Lost Communication With ECM/PCM "A" Missing Message (U010087,...,U113387). Vehicle Proximity Notification System Warning Message Display Malfunction

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