Inspection Procedure 3

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: Vehicles Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: 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. Refer to Battery Check. Battery Check The engine should start.




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

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch "ON" position.
3. Read the diagnosis code.

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

Immobilizer system DTC: Refer to Diagnostic Trouble Code Procedures. Antitheft and Alarm Systems

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: Symptom Related Diagnostic Procedures

If a malfunction is not resolved, replace the immobilizer-ECU. Then register the password (secret code) and encrypted code (Refer to How To Register Encrypted Code). The engine should start.

STEP 4. Recheck for malfunction.

Q: Is a malfunction eliminated?

YES: This diagnosis is complete. (If no malfunction are not 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.