Code 2-4-1 (EGR Flow Too Low)
- Enter test mode No. 3. See TEST MODE NO. 3 under RETRIEVING CODES
. Turn ignition on. Press test button on diagnostic unit 3 times for more than one second each. Light should flash as EGR converter is activated. Turn ignition off.
- If EGR converter is not activated, measure resistance between pins No. 6 (Blue wire) and 15 (Red/Green wire). Resistance should be about 75-95 ohms. If resistance is not as specified, check wiring and connectors.
- Disconnect EGR converter connector, located next to power steering fluid reservoir. See Fig 1
. Remove wire directly opposite Black/White wire between pin No. 1 and control unit. Reconnect connector.
- Start engine, and run it until it reaches normal operating temperature. Touch loose lead to engine ground. If engine starts to run unevenly, EGR system is operating correctly.
Courtesy of VOLVO CARS OF NORTH AMERICA.