Toyota Tacoma (2015-2018) Service Manual: Speedometer Malfunction

Toyota Tacoma (2015-2018) Service Manual / Meter / Gauge / Display / Meter / Gauge System / Speedometer Malfunction

DESCRIPTION

The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication system (CAN V1 Bus). The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (See page ).
If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores the DTCs. Troubleshoot the Brake Control System.
for Vacuum Booster type: (See page )

for Hydraulic Booster type: (See page )

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection (See page HINT: ).

HINT:

Before starting the following inspection, check tire size and tire air pressure.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output (See page Result Result ).

Result

Result	Proceed to
CAN communication DTC is not output	A
CAN communication DTC is output	B

GO TO CAN COMMUNICATION SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM (SPEED METER OPERATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) According to the display on the Techstream, perform the Active Test.

Combination Meter

Tester Display	Test Part	Control Range	Diagnostic Note
Speed Meter Operation	Speedometer	OFF, 0, 40, 80, 120, 160, 200 mph1 OFF, 0, 40, 80, 120, 160, 200, 240, 280 km/h2	Operate with IG ON and the vehicle is stopped.
There is a deviation in the values displayed on the speedometer (Control range → Speedometer display) Reference mph2: 40 → 39.4 to 42.2 80 → 80.0 to 83.2 120 → 120.9 to 124.1 Reference km/h3: 40 → 38.6 to 43.1 80 → 79.1 to 84.1 120 → 120.0 to 125.0 160 → 160.8 to 165.8

Tester Display

Test Part

Control Range

Diagnostic Note

Speed Meter Operation

Speedometer

OFF, 0, 40, 80, 120, 160, 200 mph*1
OFF, 0, 40, 80, 120, 160, 200, 240, 280 km/h*2

Operate with IG ON and the vehicle is stopped.

There is a deviation in the values displayed on the speedometer (Control range → Speedometer display)

Reference mph*2:

40 → 39.4 to 42.2
80 → 80.0 to 83.2
120 → 120.9 to 124.1

Reference km/h*3:

40 → 38.6 to 43.1
80 → 79.1 to 84.1
120 → 120.0 to 125.0
160 → 160.8 to 165.8

*1: for Speedometer with Imperial Units for Main Scale
*2: for Speedometer with Metric Units for Main Scale
*3: w/ Multi-information Display

OK:

Speedometer indication is normal.

REPLACE COMBINATION METER ASSEMBLY

3.	READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) According to the display on the Techstream, read the Data List.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Vehicle Speed Meter	Vehicle speed/ Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Approximately same as actual vehicle speed (When vehicle is being driven)	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed/

Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)

Approximately same as actual vehicle speed (When vehicle is being driven)

OK:

Vehicle speed displayed on the Techstream is almost the same as the speedometer indication.

REPLACE COMBINATION METER ASSEMBLY

4.	CHECK VEHICLE STABILITY CONTROL SYSTEM

(a) Check if a vehicle stability control DTC is output.

for Vacuum Booster type: (See page )
for Hydraulic Booster type: (See page )

Result

Result	Proceed to
Vehicle stability control DTC is not output	A
Vehicle stability control (for Vacuum Booster type) DTC is output	B
Vehicle stability control (for Hydraulic Booster type) DTC is output	C

REPLACE COMBINATION METER ASSEMBLY

GO TO VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Booster type)

GO TO VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Booster type)

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