Toyota 4Runner: Speedometer Malfunction

Toyota 4Runner Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Speedometer Malfunction

DESCRIPTION

The combination meter receives vehicle speed signals from the skid control ECU via the CAN communication line. The wheel speed sensors output voltages that vary according to the vehicle speed. The skid control ECU supplies power to the wheel speed sensors. The skid control ECU calculates the vehicle speed based on the pulses of the voltage.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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	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) Use the Active Test to check the operation of the speedometer (See page ).

Combination Meter

Tester Display	Test Part	Control Range	Diagnostic Note
Speed Meter Operation	Speedometer	0, 40, 80, 120, 160, 200 mph*1	Acceptable range (mph): [Control range → Speedometer display] 40 → 40 to 43.5 80 → 80 to 84.5 Confirm that the vehicle is stopped with the engine idling.
0, 40, 80, 120, 160, 200 km/h*2	Acceptable range (km/h): [Control range → Speedometer display] 40 → 38 to 42 80 → 78 to 84 120 → 119 to 125 160 → 159 to 167 Confirm that the vehicle is stopped with the engine idling.

Tester Display

Test Part

Control Range

Diagnostic Note

Speed Meter Operation

Speedometer

0, 40, 80, 120, 160, 200 mph*1

Acceptable range (mph): [Control range → Speedometer display]

40 → 40 to 43.5
80 → 80 to 84.5

Confirm that the vehicle is stopped with the engine idling.

0, 40, 80, 120, 160, 200 km/h*2

Acceptable range (km/h): [Control range → Speedometer display]

40 → 38 to 42
80 → 78 to 84
120 → 119 to 125
160 → 159 to 167

Confirm that the vehicle is stopped with the engine idling.

*1: for U.S.A.
*2: except U.S.A.

OK:

Speedometer indication is normal.

Result

Result	Proceed to
OK	A
NG (for 4WD)	B
NG (for 2WD)	C

REPLACE MASTER CYLINDER SOLENOID

SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

3.	READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)

(a) Use the Data List to check if the speedometer is operating properly (See page ).

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Vehicle Speed Meter	Vehicle speed/Min.: 0 mph (0 km/h), Max.: 255 km/h (158 mph)	Almost the same as actual vehicle speed measured using a speedometer tester	-

OK:

Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

Result

Result	Proceed to
NG	A
OK (for 4WD)	B
OK (for 2WD)	C

REPLACE MASTER CYLINDER SOLENOID

SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

4.	READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Use the Data List to check the vehicle speed (See page ).

ABS/VSC/TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Vehicle Speed	Vehicle speed/Min.: 0 mph (0 km/h), Max.: 326 km/h (202 mph)	Actual vehicle speed	No large fluctuations when driving at a constant speed.

OK:

Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

Result

Result	Proceed to
OK	A
NG (for 4WD)	B
NG (for 2WD)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM

5.	REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new or normally functioning one (See page ).

OK:

The operation of the speedometer returns to normal.

Result

Result	Proceed to
OK	A
NG (for 4WD)	B
NG (for 2WD)	C

END

REPLACE MASTER CYLINDER SOLENOID

SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

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