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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1507 (Engine Control System) >> On Board Diagnostic (OBD) System >> Emission-related Diagnostic Information >> How To Erase Emission Related Diagnostics Information >> How to Erase Diagnostic Trouble Codes

How to Erase Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

With CONSULT-II 

The emission related diagnostic information in the ECM can be erased by selecting "ERASE" in the "SELF-DIAG RESULTS" mode with CONSULT-II.

If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individually from the ECM and TCM (Transmission control module).

NOTE: If the DTC is not for AT related items (see "INDEX FOR DTC "), skip steps 2 through 4.
  1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.
  2. Turn CONSULT-II ON and touch "AT" (4-speed A/T models) or "TRANSMISSIION" (5-speed A/T models).
  3. Touch "SELF-DIAG RESULTS".
  4. Touch "ERASE". [The DTC in the TCM (Transmission control module) will be erased.] Then touch "BACK" twice.
  5. Touch "ENGINE".
  6. Touch "SELF-DIAG RESULTS".
  7. Touch "ERASE". (The DTC in the ECM will be erased.)
    Fig 1: Erasing DTC With CONSULT-II
    G02446713Courtesy of NISSAN MOTOR CO., U.S.A.

With GST 

The emission related diagnostic information in the ECM can be erased by selecting "Service $04" with GST.

NOTE: If the DTC is not for AT related items (see "INDEX FOR DTC "), skip step 2.
  1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.
  2. Perform HOW TO ERASE DIAGNOSTIC TROUBLE CODES (WITH GST) - 4 SPEED or HOW TO ERASE DIAGNOSTIC TROUBLE CODES (WITH GST) - 5 SPEED . (The DTC in the TCM will be erased.).
  3. Select "Service >04" with GST (Generic Scan Tool).

No Tools 

NOTE: If the DTC is not for AT related items (see "INDEX FOR DTC "), skip step 2.
  1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.
  2. Perform HOW TO ERASE DIAGNOSTIC TROUBLE CODES (NO TOOLS) - 4 SPEED or HOW TO ERASE DIAGNOSTIC TROUBLE CODES (NO TOOLS) - 5 SPEED . (The DTC in the TCM will be erased.).
  3. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to "HOW TO SWITCH DIAGNOSTIC TEST MODE ".
    • If the battery is disconnected, the emission-related diagnostic information will be lost within 24 hours. 
    • The following data are cleared when the ECM memory is erased. 
    • Diagnostic trouble codes
    • 1st trip diagnostic trouble codes
    • Freeze frame data
    • 1st trip freeze frame data
    • System readiness test (SRT) codes
    • Test values

Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all of the data listed above, are cleared from the ECM memory during work procedures.

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