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Home >> Volvo >> 2002 >> S80 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Central Electronic Module (CEM), Rear Electronic Module (Rem), Upper Electronics Module (UEM) - Diagnostic Trouble Codes - 1 Of 13) >> CEM-1A21: Increased Power Supply Relay. Signal Too High. Intermittent Fault (2001-2004) >> Signal too high. Intermittent fault. >> Checking the relay

Checking the relay

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Check that relay 2/29 is installed correctly.

At the same time check relay connection for contact resistance and oxidation as described in Contact resistance and oxidation , and for a loose contact as described in Loose connections (terminals) .

Additional information 

Fig 1: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Relays
GLL104048Courtesy of VOLVO CARS OF NORTH AMERICA.

Is there a fault?