Volvo 240/740/760/780/940/960 1990-1998

Clearing Codes

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1990-94 Vehicles
  1. Turn the ignition switch to the ON position.
  2.  
  3. Read fault codes.
  4.  
  5. Press diagnostic socket button 1 time and hold for approximately 5 seconds. Release button. After 3 seconds the diode light should light up. While the light is still lit, press the button again and hold for approximately 5 seconds. After releasing the button, the diode light should go off.
  6.  
  7. To ensure that the memory is erased, press the button 1 time, for 1 second but not more than 3 seconds. The diode light should flash code 1-1-1.
  8.  
  9. Start and run engine. If engine will not start, correct the problem before proceeding and start over with Step 1.
  10.  
  11. Check to see if new fault codes have been stored in the memory by pressing the diagnostic socket button 1 time, for 1 second but not more than 3 seconds.
  12.  
  13. If fault code 1-1-1 flashes, it indicates that there are no additional fault codes stored in its memory.
  14.  

1995-98 Vehicles

Control module reset procedures are a very important part of OBD-II system diagnostics. This step should be done at the end of any fault code repair and at the end of any driveability repair.

Clearing codes can be performed by any of the methods below:



Clear the control module memory with the Generic Scan Tool (GST)
 
Clear the control module memory with the vehicle manufacturers specific tester
 
Turn the ignition off and remove the negative battery cable for at least 1 minute.
 

Removing the negative battery cable may cause other systems in the vehicle to loose their memory. Prior to removing the cable, ensure you have the proper reset codes for radios and alarms.

The MIL will may also be de-activated for some codes if the vehicle completes three consecutive trips without a fault detected with vehicle conditions similar to those present during the fault.

 
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