Vehicle Speed Signal Circuit Between Multi-Display and Combination Meter

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Vehicle Speed Signal Circuit between Multi-display and Combination Meter

DESCRIPTION

The multi-display performs switch operation control during driving by receiving a vehicle speed signal from the combination meter.
HINT:
- A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
- If a short occurs in an ECU, all systems in the diagram below will not operate normally.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check if the function of the speedometer in the combination meter is normal.
OK:
Actual vehicle speed and the speed indicated on the speedometer are the same.
HINT:
The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

NG -- GO TO COMBINATION METER SYSTEM
OK -- Continue to next step.
2. INSPECT MULTI-DISPLAY




(a) Disconnect the multi-display connector J50.
(b) Measure voltage.
(1) Jack up either one of the drive wheels.
(2) Move the shift lever to the neutral position.
(3) Turn the engine switch on (IG).





(4) Measure the voltage between terminal SPD of the multi-display and body ground when the drive wheels are turned slowly.
OK:
Voltage pulses as shown in the illustration.
OK -- REPLACE MULTI-DISPLAY
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)




(a) Disconnect the multi-display connector J50 and combination meter connector J34.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)




(a) Disconnect the multi-display connector J50 and combination meter connector J34.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT:
If the resistance between terminal SPD and body ground is less than 10 kOhms, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU
OK -- REPLACE COMBINATION METER