Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Volvo V40FACTORY OEM SERVICE PROCEDURE
Engine Control - Symptom Related Diagnostic Procedures
- Checking On/Off Selector Switch, Brake And Clutch Valves (B4204T2 CVVT; 2000)
- Checking the ON/OFF selector switch, brake and clutch valves
- Terminal
- Checking the response code for the ON/OFF switch
- Checking the response code for the brake valves
- Checking brake valves
- Checking for a short-circuit
- Checking the response code for the clutch valve
- Checking response code 3-1-1
- Checking the clutch valve
- Adjusting the clutch valve
- Checking the voltage to the selector switch
- Checking for an open-circuit
- Checking the selector switch
- Checking the connector for the selector switch
- Replacing the component
- Checking the power supply to the brake valve
- Checking the cable between the selector switch and the brake valve
- Fault-tracing information
- Adjusting the brake valve
- Checking the power supply for the clutch valve
- Checking the cable between the brake valve and the clutch valve
- Checking the power supply for the control module
- Checking the cable between the brake valve/clutch valve and the control module
- Checking the control module connectors
- Brake pedal vacuum valve, replacement
- Information
- Fault-tracing information
- Checking the ON/OFF selector switch, brake and clutch valves
- Checking On/Off Selector Switch, Brake And Clutch Valves (B4204T3 (Ca) (Us); 2001-2003)
- Checking On/Off Selector Switch, Brake And Clutch Valves (B4204T4; 2003-2004)
- Checking Park/Neutral Position Switch (PNP) (Automatic Transmission) (B4204T2 CVVT; 2000)
- Checking the Park/Neutral position (PNP) switch (automatic transmissions)
- Terminal
- Checking the response code
- Checking response code 3-1-1
- Checking the function of the Park/Neutral position (PNP) switch
- Checking components
- Checking the power supply to the control module
- Checking for an open-circuit
- Checking the control module connectors
- Fault-tracing information
- Replacing the component
- Information
- Fault-tracing information
- Checking the Park/Neutral position (PNP) switch (automatic transmissions)
- Checking Park/Neutral Position Switch (PNP) (Automatic Transmission) (B4204T3 (Ca) (Us); 2001-2003)
- Checking Park/Neutral Position Switch (PNP) (Automatic Transmission) (B4204T4; 2003-2004)
- Checking Resume Switch (B4204T2 CVVT; 2000)
- Checking the RESUME switch
- Terminal
- Checking the response code
- Checking response code 3-1-1
- Checking other response codes
- Checking the voltage to the selector switch
- Checking for an open-circuit
- Checking the selector switch
- Checking the connector for the selector switch
- Replacing the component
- Checking the power supply for the control module
- Checking for a short-circuit
- Checking the cable between the selector switch and the control module
- Checking the control module connectors
- Fault-tracing information
- Information
- Fault-tracing information
- Checking the RESUME switch
- Checking Resume Switch (B4204T3 (Ca) (Us); 2001-2003)
- Checking Resume Switch (B4204T4; 2003-2004)
- Checking Set- Switch (B4204T2 CVVT; 2000)
- Checking the SET- switch
- Terminal
- Checking the response code
- Checking response code 3-1-1
- Checking other response codes
- Checking the voltage to the selector switch
- Checking for an open-circuit
- Checking the selector switch
- Checking the connector for the selector switch
- Replacing the component
- Checking the power supply for the control module
- Checking for a short-circuit
- Checking the cable between the selector switch and the control module
- Checking the control module connectors
- Fault-tracing information
- Information
- Fault-tracing information
- Checking the SET- switch
- Checking Set- Switch (B4204T3 (Ca) (Us); 2001-2003)
- Checking Set- Switch (B4204T4; 2003-2004)
- Checking Set+ Switch (B4204T2 CVVT; 2000)
- Checking the SET+ switch
- Terminal
- Checking the response code
- Checking response code 3-1-1
- Checking other response codes
- Checking the voltage to the selector switch
- Checking for an open-circuit
- Checking the selector switch
- Checking the connector for the selector switch
- Replacing the component
- Checking the power supply for the control module
- Checking for a short-circuit
- Checking the cable between the selector switch and the control module
- Checking the control module connectors
- Fault-tracing information
- Information
- Fault-tracing information
- Checking the SET+ switch
- Checking Set+ Switch (B4204T3 (Ca) (Us); 2001-2003)
- Checking Set+ Switch (B4204T4; 2003-2004)
- Checking The Brake Light Switch (B4204T2 CVVT; 2000)
- Checking the stop (brake) lamp switch
- Terminal
- Checking the response code
- Checking response code 3-1-1
- Checking the stop (brake) lamp
- Checking fuses
- Checking for a short-circuit
- Checking the 30-supply to the fuse
- Checking for an open-circuit
- Checking the voltage to the stop (brake) lamp switch
- Checking the stop (brake) lamp switch
- Replacing the component
- Checking the stop (brake) lamp bulbs
- Checking the power supply to the control module
- Checking the resistance in the signal cable
- Checking the control module connectors
- Fault-tracing information
- Brake light switch, replacement
- Information
- Checking the stop (brake) lamp switch
- Checking The Brake Light Switch (B4204T3 (Ca) (Us); 2001-2003)
- Checking The Brake Light Switch (B4204T4; 2003-2004)
- Checking The Vacuum System (B4204T2 CVVT; 2000)
- Checking the vacuum system
- Terminal
- Checking the ground lead. Checking the power supply
- Checking the function of the governor
- Checking the cable for the governor
- Checking for a short-circuit
- Checking the power supply for the governor
- Checking for an open-circuit
- Checking the cable to the vacuum pump
- Checking the voltage to the vacuum pump
- Checking the resistance in the cable
- Checking the governor
- Checking for contact resistance and oxidation
- Replacing the component
- Checking the function of the vacuum pump
- Checking that the vacuum system is air tight
- Checking for leaks
- Checking the vacuum pump
- Checking brake valves
- Fault-tracing information
- Adjusting the brake valve
- Checking components
- Checking the clutch valve
- Adjusting the clutch valve
- Vacuum pump and regulator
- Information
- Fault-tracing information
- Checking the vacuum system
- Checking The Vacuum System (B4204T3 (Ca) (Us); 2001-2003)
- Checking The Vacuum System (B4204T4; 2003-2004)
- Replacement Of Control Module
- Replacement Of Selector Switch (Turn Indicator)
- Replacement Of Clutch Pedal Vacuum Valve
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.