Lexus NX: Tachometer Malfunction
DESCRIPTION
In this circuit, the combination meter assembly receives engine speed signals from the hybrid vehicle control ECU via the CAN communication system. 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, make sure to replace it with a new one.
PROCEDURE
| 1. | CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Check for DTCs.
Click here .gif)
OK:
No DTCs are output.
| NG | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
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| 2. | CHECK FOR DTC (HYBRID CONTROL SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO HYBRID CONTROL SYSTEM |
|
| 3. | PERFORM ACTIVE TEST USING TECHSTREAM (TACHOMETER OPERATION) |
(a) Using the Techstream, perform the Active Test.
Click here
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| TachoMeter Operation | Tachometer | OFF, 0, 1000, 2000, 3000, 4000, 5000, 6000 or 7000 (rpm) | - |
| Tester Display |
|---|
| TachoMeter Operation |
OK:
Tachometer indication is normal.
| NG | | REPLACE COMBINATION METER ASSEMBLY |
|
| 4. | READ VALUE USING TECHSTREAM (ENGINE REVOLUTION, ENGINE RPM) |
(a) Using the Techstream, read the Data List.
Click here
| Tester Display | Measurement Item | Normal Condition | Reference Value | Diagnostic Note |
|---|---|---|---|---|
| Engine Revolution | Engine speed | Min.: 0 rpm, Max.: 16383 rpm | Actual engine speed | - |
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Engine Rpm | Engine speed | Min.: 0 rpm, Max.: 12750 rpm | Actual engine speed | - |
| Tester Display |
|---|
| Engine Revolution |
| Tester Display |
|---|
| Engine Rpm |
HINT:
- When the Data List values of the ECUs match, an internal malfunction of the hybrid vehicle control ECU is suspected.
- When the Data List values of the ECUs do not match, a signal output error of the hybrid vehicle control ECU or an internal malfunction of the combination meter assembly is suspected.
OK:
The Data List values of the ECUs do not match.
| NG | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 5. | CHECK COMBINATION METER ASSEMBLY |
(a) Replace the combination meter assembly.
Click here
(b) Check that the operation of the tachometer returns to normal.
OK:
The operation of the tachometer returns to normal.
| OK | | END (COMBINATION METER ASSEMBLY IS DEFECTIVE) |
| NG | | REPLACE HYBRID VEHICLE CONTROL ECU |
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