Check for intermittent short-circuit

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 cables for a short-circuit to ground according to Short-circuit to ground, intermittent faults .

CAUTION:

The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

Cars with Fenix 5.2, the cable between immobilizer control module #2 and engine control module (ECM) #B5.
Cars with M4.4, MSA 15.7, cable between immobilizer control module #4 and engine control module (ECM) #B36.

Fig 1: Identifying Control Module Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohms Display

Courtesy of VOLVO CARS OF NORTH AMERICA.