Toyota Yaris: Meter / Gauge System / Tachometer Malfunction
DESCRIPTION
In this circuit, the combination meter assembly receives engine speed signals from the ECM via CAN communication. The combination meter assembly displays the engine speed calculated based on the data received from the ECM.
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 ECM, refer to Registration.
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PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication DTCs are output.
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| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B |
 | GO TO CAN COMMUNICATION SYSTEM |
|
| 2. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check if SFI system DTCs are output.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B |
 | GO TO SFI SYSTEM |
|
| 3. | PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Combination Meter > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| TachoMeter Operation (0rpm) | Tachometer (0 rpm) | ON | - |
| TachoMeter Operation (1000rpm) | Tachometer (1000 rpm) | ON | - |
| TachoMeter Operation (2000rpm) | Tachometer (2000 rpm) | ON | - |
| TachoMeter Operation (3000rpm) | Tachometer (3000 rpm) | ON | - |
| TachoMeter Operation (4000rpm) | Tachometer (4000 rpm) | ON | - |
| TachoMeter Operation (5000rpm) | Tachometer (5000 rpm) | ON | - |
| TachoMeter Operation (6000rpm) | Tachometer (6000 rpm) | ON | - |
| TachoMeter Operation (7000rpm) | Tachometer (7000 rpm) | ON | - |
| TachoMeter Operation (8000rpm) | Tachometer (8000 rpm) | ON | - |
| Tester Display |
|---|
| TachoMeter Operation (0rpm) |
| Tester Display |
|---|
| TachoMeter Operation (1000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (2000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (3000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (4000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (5000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (6000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (7000rpm) |
| Tester Display |
|---|
| TachoMeter Operation (8000rpm) |
OK:
Tachometer indication is normal.
| OK |
 | REPLACE ECM |
| NG |
 | REPLACE COMBINATION METER ASSEMBLY |
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Supplemental Restraint System (SRS) Precautions
The front and side supplemental restraint systems (SRS) include different types of air bags. Please verify the different types of air bags which are equipped on your vehicle by locating the “SRS AIRBAG” location indicators. These indicators are visible in the area where the air bags are installed.
The air bags are installed in the following locations:
The steering wheel hub (driver air bag) The front passenger dashboard (front passenger air bag) The outboard sides of the front seatbacks (side air bags) The front and rear window pillars, and the roof edge along both sides (curtain air bags)