Lexus IS250 IS220d GSE20 ALE20 - METER
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL)
READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL)
CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
INSPECT COMBINATION METER ASSEMBLY
METER / GAUGE SYSTEM - Tachometer Malfunction
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester ON.
Enter the following menus: Diagnosis / Body / Combination Meter / Active Test.
Check the values by referring to the table below.
| Item | Test Details | Diagnostic Note |
| Tacho Meter Operation | 0, 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000 (rpm) | - |
- OK:
- Needle indication is normal.
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| OK | ||
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| 3.READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester ON.
Enter the following menus: Diagnosis / Power Train / Engine / Data Test.
Check the values by referring to the table below.
| Item | Measurement Item/Range (Display) | Normal Condition | Diagnostic Note |
| Engine Spd | Engine speed/Min.: 0 rpm, Max.: 16,383 rpm | Almost same as actual engine speed (When engine is running) | - |
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| OK | |
| 4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) |
Disconnect the A6(*1) / E59 (*2) and J34 connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition A6-16 (TACH) (*1) - J34-16 (S) Always Below 1 Ω A6-16 (TACH) (*1) - Body ground Always 10 kΩ or higher A49-13 (TACH) (*2) - J34-16 Always Below 1 Ω A49-13 (TACH) (*2) - Body ground Always 10 kΩ or higher
*1: for 4GR-FSE
*2: for 2AD-FHV
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| OK | |
| 5.INSPECT COMBINATION METER ASSEMBLY |
Check the input signal waveform.
Remove the combination meter with the connector still connected.
Connect the oscilloscope to terminal J34-16 (S) and body ground.
Start the engine.
Check the signal waveform according to the condition(s) in the table below.
| Item | Condition |
| Tool setting | 5 V/DIV., 10 ms./DIV. |
| Vehicle condition | Engine idle speed |
- OK:
- The waveform is displayed as shown in the illustration.
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| NG | ||
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