Checking cables and connectors

Check ignition coil connector for contact resistance and oxidation Contact resistance and oxidation and loose connections according to Loose connections (terminals)

Check signal cable between ignition coil #1 and control module:

#A31 (#A31) (ECM 3300)
#A50 (#A50) (ECM 3310)
#A52 (#A52) (ECM 3320)
#A49 (#A49) (ECM 3330)
#A30 (#A30) (ECM 3340)
#A51 (#A51) (ECM 3350)

and power supply between system relay #3 and ignition coil #4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

Connecting the breakout box/accessing the control module, see Connecting the breakout box .
To access/replace the ignition coil, see Replacing ignition coil .
For information about signals:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ignition Coil

Courtesy of VOLVO CARS OF NORTH AMERICA.