Tachometer Check
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-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.NOTE: The value in parentheses is a reference value.ENGINE SPEED SPECIFICATION (STANDARD VALUE)
ENGINE SPEED r/min TACHOMETER INDICATING TOLERANCE r/min 600 500 - 700 (2,000) (1,900 - 2,100) 3,000 2,850 - 3,150 (4,000) (3,850 - 4,150) 5,000 4,850 - 5,150 6,000 5,850 - 6,150