Checking wiring

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Check the engine control module (ECM) and engine speed (RPM) sensor connectors. Check for contact resistance and oxidation according to Contact resistance and oxidation .

Check in particular for damage or loose terminal pins.

Check the signal cables between engine control module (ECM) terminals #54 and #24 and engine speed (RPM) sensor terminals #2 and #1. Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults . Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Check for a short-circuit to each other. Remedy if necessary.

If no faults are found in the above fault-tracing, try a new engine speed (RPM) sensor. See Replacing engine speed (RPM) sensor .

Other information

To connect the breakout box, see Connecting the breakout box. EMS 2000 .

Fig 1: Identifying Engine Speed (RPM) Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

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