Intermittent Fault

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.

Check the ECC control module and power unit connectors for contact resistance and oxidation according to Contact Resistance And Oxidation .

Check cable between ECC control module #A14 and power unit terminal #A2 for an open-circuit according to Open-Circuit, Intermittent Faults and an intermittent short-circuit to ground according to Short-Circuit To Ground, Intermittent Faults .

Remedy as necessary.

Other information

To remove the control module, refer to Replacing ECC Control Module .
To access/replace the power unit, refer to Replacing the Power Unit (Electronic Climate Control) .
Connection of breakout box to ECC control module, refer to Connection Of Breakout Box ECC .
The voltage on the signal cable varies between approximately - 0.22-2.5 V. For other values, see Signal Specification ECC .

Fig 1: Identifying 4-Pin Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Climate Control Module Connectors Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Information