Reading And Erasing Diagnostic Trouble Codes (DTCs)

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Stored diagnostic trouble codes (DTCs) can be erased using this function. The on-board diagnostic (OBD) system can identify 10 different faults in the form of diagnostic trouble codes (DTCs).

To reading off diagnostic trouble codes (DTCs), proceed as follows:

ignition ON, position I or II.
wait approximately 3 seconds.
ignition off
ignition on again
wait for 0.5 seconds. If a diagnostic trouble code (DTC) is stored, the indicator LED will flash once. It is now possible to continue pressing the button to obtain system responses.
press the REC button in twice within the following 2.5 seconds
read off the flashes from the REC indicator LED.

The REC button indicator LED is on for 1 second and off for 0.5 second. The timing between the numbers in a DTC code sequence is 2 seconds. The time between two codes is 5 seconds. If no diagnostic trouble codes (DTCs) are set the code will be 1-1-1.

For erasing diagnostic trouble codes (DTCs), proceed as follows:

ignition ON, position I or II.
wait approximately 3 seconds.
ignition off
ignition on again
wait for 0.5 seconds. If a diagnostic trouble code (DTC) is stored, the indicator LED will flash once. It is now possible to continue pressing the button to obtain system responses.
press in the REC button four times within the following 2.5 seconds

NOTE: The diagnostic trouble codes (DTCs) can also be erased by disconnecting the control module for more than 2 minutes (supply voltage power disconnected), because after 2 minutes the entire control module memory will be erased. Diagnostic trouble code (DTC) 5-1-2 can only be erased by disconnecting the control module for more than 2 minutes or by carrying out a successful self-adjustment.

HINT: If the indicator LED still flashes once when the ignition is turned on this means the erasure procedure has not been successfully completed and the diagnostic trouble code (DTC) has again been stored.

The exception is diagnostic trouble code (DTC) MCC 1-1-1 for certain control modules

Fig 1: Identifying Label On MCC Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE: On the MCC/STANDARD control modules introduced at production start-up of the S70/V70/C70 series must fault-tracing for MCC 3-4-2 be carried out if the REC button orange indicator LED flashes once at ignition on (diagnostic trouble code (DTC) stored) but the control module flashes out diagnostic trouble code (DTC) 1-1-1. This applies to control modules marked "S2", "S3" or "S4". See illustration.