Reading and Clearing Diagnostic Trouble Codes

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

NOTE: If Battery positive voltage is low, diagnostic trouble codes may not be output. Be sure to check the battery and charging system before continuing.

NOTE: If battery cable is disconnected or if the Engine Control Module (ECM) connector or Powertrain Control Module (PCM) connector is disconnected, the diagnostic trouble codes will be erased. Do not disconnect the battery cable or ECM or PCM connector until the diagnostic trouble codes have been recorded.

NOTE: If a DTC is erased, its "freeze frame" data will be also erased and the readiness test status will be reset. If necessary store the "freeze frame" data before erasing the DTC.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the diagnostic trouble codes for MFI.
4. Refer to the DIAGNOSTIC TROUBLE CODE CHART.
5. Turn the ignition switch to the "LOCK" (OFF) position and then back to "ON" again.
6. Erase the diagnostic trouble code(s) using MUT-II screen prompts.
7. Confirm that the diagnostic trouble code output is normal.
8. Turn the ignition switch to the "LOCK" (OFF) position.
9. Disconnect scan tool MB991502 from the data link connector.