Check, Cables And Components
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.
NOTE:
This test is designed for the electrical circuit between ECC/MCC control module and engine control module (ECM) via the low pressure switch.
Check the connectors on the ECC/MCC control module, low pressure switch and engine control module (ECM) for contact resistance and oxidation according to Contact Resistance And Oxidation .
Check signal cable between ECC control module #A3 (MCC control module #B22) and engine control module (ECM) for an open-circuit according to Open-Circuit, Permanent Faults .
At normal system pressure in the air conditioning (A/C) system the low pressure switch should be closed (approximately 0 ohm). If the pressure is too low the switch is open (infinite resistance).
Remedy as necessary.
Other information:
- To access/replace the ECC control module, refer to Replacing ECC Control Module .
- To access/replace the MCC control module, refer to Replacing Or Adjusting Control Cables/Mechanical Rear Section And Control Panel/Front Section (Manual Climate Control/STANDARD) .
- Connection of breakout box to ECC control module, refer to Connection Of Breakout Box ECC .
- Connection of breakout box to MCC control module, refer to Connection Of Breakout Box MCC .
- Voltage on the cable should be 0-2 V below air conditioning battery voltage when the control module demands air conditioning (A/C), approximately 0 V when air conditioning (A/C) is not demanded. For other signals, see Signal Specification ECC and Signal Descriptions MCC .