Intermittent Fault

Check the ECC control module and engine control module (ECM) connectors for contact resistance and oxidation according to Contact Resistance And Oxidation .

Check cable between ECC control module #B2 and engine control module (ECM) for an intermittent open-circuit according to Open-Circuit, Intermittent Faults and an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults , and an intermittent short-circuit to ground according to Short-Circuit To Ground, Intermittent Faults .

Also check cable between ECC control module #B2 and combined instrument panel #A26 for an intermittent short-circuit to supply voltage according to Short-Circuit To Supply Voltage, Intermittent Faults and an intermittent short-circuit to ground according to Short-Circuit To Ground, Intermittent Faults .

Remedy as necessary.

Other information: 

• To disconnect ECC control module, refer to Replacing ECC control module .
• Connection of breakout box to ECC control module, refer to Connection of breakout box ECC .
• The frequency on the coolant temperature signal varies with the temperature. For other values, see Signal specification ECC .

Fig 1: Identifying Connector A Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Connector B

Courtesy of VOLVO CARS OF NORTH AMERICA.

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