Tachometer Check
Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness A (Vehicles with CAN communication system)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
- Connect scan tool MB991958 to the data link connector.
- A/T select lever: "P" position.
- Turn the ignition switch to "ON" position.
- Start the engine.
- Run the engine.
- Select MFI system data list and take a reading of the engine speed.
Item 22: CKP SENSOR
- Compare the engine speed shown in the scan tool with that shown on the tachometer. The engine speeds shown on the tachometer should correspond to the table below.NOTE: The following standard value assumes that battery voltage is 13.5 volts.TACHOMETER STANDARD VALUE CHART
Engine speed (r/min) Indication allowance of tachometer r/min 600 600 +/- 100 2,000 2,000 +/- 100 3,000 3,000 +/- 150 4,000 4,000 +/- 150 5,000 5,000 +/- 150 6,000 6,000 +/- 150