Inspection Procedure 6

Inspection Procedure 6: The engine will not start with KOS (IG knob operates normally).

CAUTION:
Before replacing the ECU, ensure that the communication circuit is normal.

TROUBLESHOOTING HINTS

- The CAN bus line is defective.
- Malfunction of the MFI system
- Function setting error or no setting with customization
- VIN not written or unmatched

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line





(1)
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. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES Go to Step 2.

NO Repair the CAN bus line. CAN Bus Diagnostics Chart).

STEP 2. Using scan tool MB991958, read the KOS-ECU diagnostic trouble code.

Check if DTC is set to the KOS-ECU.

Q. Is the DTC set?

YES Troubleshoot the KOS. (Refer to Keyless Operation System (KOS)).
NO Go to Step 3.
STEP 3. Using scan tool MB991958, Check the customization function.

Use the ETACS-ECU customization function to check that the "KOS feature" is set to "Both enable" or "ENG start enable".

(1)Turn the ignition switch to the "ON" position.

(2)Use the ETACS-ECU configuration function to check that the "KOS feature" is set to "Both enable" or "ENG start enable".

(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is it set to "Both enable" or "ENG start enable"?

YES Go to Step 4.
NO Use the ETACS-ECU configuration function to set the "KOS feature" to "Both enable" or "ENG start enable" (Refer to Configuration Function).
STEP 4. Check that the engine starts.

Q. Does the engine start?

YES The procedure is complete.
NO Multiport Fuel Injection (MFI).