Inspection Procedure 4

Engine does not Start (Cranking but no Initial Combustion).

TECHNICAL DESCRIPTION (COMMENT)
If the fuel injectors are not operating, there might be a problem with the MFI system in addition to a malfunction of the immobilizer system. It is normal for this to occur if an attempt is made to start the engine using a key that has not been properly registered.

TROUBLESHOOTING HINTS
- Malfunction of MFI system
- Malfunction of immobilizer-ECU.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)

STEP 1. Check the battery positive voltage.
Measure the battery positive voltage during cranking.

Q: Is the voltage 8 volts or more?

YES: Go to Step 2.

NO: Check the battery. The engine should start.

STEP 2. Using scan tool MB991958, read the any diagnostic trouble code.




1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch "ON" position.
3. Read the immobilizer system diagnostic trouble code and MFI system diagnostic trouble code.

Q: Which DTC resets, the immobilizer system DTC or the MFI system DTC?

Immobilizer system DTC : Refer to Diagnostic Trouble Code Chart. Diagnostic Trouble Code Descriptions

MFI system DTC : Testing and Inspection

No DTC : Go to Step 3.

STEP 3. Check the starting system.

Q: Does the engine start?

YES: Go to Step 4.

NO: Testing and Inspection
If a malfunction is not resolved, replace the immobilizer-ECU. Then register the password (secret code) and encrypted code. The engine should start.

STEP 4. Recheck for malfunction.

Q: Is a malfunction eliminated?

YES: The procedure is complete. (If no malfunction are found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

NO: Replace the immobilizer-ECU.