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.
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HOMESERVICE MANUALSVOLVO2004C70 2.4 63REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) DIAGNOSTICS - 3 OF 14 (CONVERTIBLE)
2004 Volvo C70 2.4 63
Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 3 Of 14 (Convertible)
2004 Volvo C70 2.4 63SECTION Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 3 Of 14 (Convertible)
- EFI-433: Rear Knock Sensor (KS), Signal. Faulty Signal. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-433: Rear Knock Sensor (KS), Signal. Faulty Signal. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-435: Front Heated Oxygen Sensor (Ho2S). Too Slow (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-435
- Faulty signal
- Notes
- Checking compression
- Checking fuel and residual pressures
- Replacing Front Heated Oxygen Sensor (HO2S)
- Checking for air leakage
- Fuel pressure and residual pressure
- Check the fuel pump relay's two-stage function
- Information
- Checking fuel pressure and residual pressure
- Notes
- Choosing a method for taking a reading
- Checking vacuum hose to pressure regulator
- Checking hose and connection
- Connect pressure gauge
- Starting fuel pump (FP)
- Measuring line pressure
- Line pressure too high
- Replacing Pressure Regulator
- Checking for blockage
- Line pressure too low
- Checking fuel filter
- Replacing Fuel Filter
- Checking pressure regulator, pressure reduction
- Checking pressure regulator, pressure increase
- Checking residual pressure
- Checking injectors, connections, pressure regulator, fuel pump non-return valve and lines
- Disconnecting pressure gauge
- Stop fuel pump (FP)
- Stop fuel pump
- Start fuel pump
- Verification
- EFI-436: Rear Heated Oxygen Sensor (Ho2S). Compensation (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-436
- Faulty signal
- Notes
- Checking compression
- Checking fuel and residual pressures
- Replacing Front Heated Oxygen Sensor (HO2S)
- Checking for air leakage
- Fuel pressure and residual pressure
- Information
- Checking fuel pressure and residual pressure
- Notes
- Choosing a method for taking a reading
- Checking vacuum hose to pressure regulator
- Checking hose and connection
- Connect pressure gauge
- Starting fuel pump (FP)
- Measuring line pressure
- Line pressure too high
- Replacing Pressure Regulator
- Checking for blockage
- Line pressure too low
- Checking fuel filter
- Replacing Fuel Filter
- Checking pressure regulator, pressure reduction
- Checking pressure regulator, pressure increase
- Checking residual pressure
- Checking injectors, connections, pressure regulator, fuel pump non-return valve and lines
- Disconnecting pressure gauge
- Stop fuel pump (FP)
- Stop fuel pump
- Start fuel pump
- Verification
- EFI-442: Pulsed Secondary Air Injection System (Pair) (B5234T3; B5254T; 1998)
- EFI-443: Three-Way Catalytic Converter (TWC) Efficiency. Faulty Signal (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-443
- Faulty signal
- Notes
- Checking compression
- Checking fuel and residual pressures
- Replacing Rear Heated Oxygen Sensor (HO2S)
- Checking for air leakage in the intake system
- Fault tracing information
- Checking for air leakage in the exhaust system
- Fuel pressure and residual pressure
- Information
- Checking fuel pressure and residual pressure
- Notes
- Choosing a method for taking a reading
- Checking vacuum hose to pressure regulator
- Checking hose and connection
- Connect pressure gauge
- Starting fuel pump (FP)
- Measuring line pressure
- Line pressure too high
- Replacing Pressure Regulator
- Checking for blockage
- Line pressure too low
- Checking fuel filter
- Replacing Fuel Filter
- Checking pressure regulator, pressure reduction
- Checking pressure regulator, pressure increase
- Checking residual pressure
- Checking injectors, connections, pressure regulator, fuel pump non-return valve and lines
- Disconnecting pressure gauge
- Stop fuel pump (FP)
- Stop fuel pump
- Start fuel pump
- Verification
- EFI-444: Accelerometer. Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-444: Accelerometer. Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-444
- Signal too high. Permanent fault
- Notes
- Checking power cable
- Checking for a short-circuit
- Checking ground lead
- Checking control module connector
- Checking for an open-circuit
- Fault-tracing information
- Checking the signal cable
- Checking accelerometer
- Checking accelerometer, continued
- Replacing Accelerometer
- Checking power cable resistance to ground
- Car-equipment: level
- Checking the air conditioning (A/C) pressure sensor
- Checking fuel tank pressure sensor
- Checking atmospheric pressure sensor
- Replacing Atmospheric Pressure Sensor
- Replacing Air Conditioning (A/C) Pressure Sensor
- Replacing Fuel Tank Pressure Sensor
- Verification
- Information
- EFI-444: Accelerometer. Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-444: Accelerometer. Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-445: Pulsed Secondary Air Injection System (Pair) Pump. Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-445: Pulsed Secondary Air Injection System (Pair) Pump. Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-445: Pulsed Secondary Air Injection System (Pair) Pump. Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-445: Pulsed Secondary Air Injection System (Pair) Pump. Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-445
- Signal too low. Permanent fault
- Notes
- Checking power cable
- Checking for an open-circuit
- Checking signal cable resistance
- Checking the signal cable
- Checking pulsed secondary air injection system (PAIR) pump relay
- Checking for contact resistance and oxidation
- Replacing Pulsed Secondary Air Injection System (PAIR) Pump Relay
- Connector A
- Information
- Verification
- EFI-446: Pulsed Secondary Air Injection System (Pair) Pump. Leakage. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-446: Pulsed Secondary Air Injection System (Pair) Pump. Leakage. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-446
- Leakage. Permanent fault
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Missing. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Missing. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-447: Pulsed Secondary Air Injection System (Pair) Solenoid Valve. Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-448: Pulsed Secondary Air Injection System (Pair) Pump. Flow Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-448: Pulsed Secondary Air Injection System (Pair) Pump. Flow Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-448
- Flow too low: Permanent fault
- Notes
- Checking pulsed secondary air injection system (PAIR) pump
- Checking pulsed secondary air injection system (PAIR) pump power supply
- Replacing Pulsed Secondary Air Injection System (PAIR) Pump Relay
- Checking pulsed secondary air injection system (PAIR) pump resistance
- Replacing Pulsed Secondary Air Injection System (PAIR) Pump
- Checking pulsed secondary air injection system (PAIR) pump ground terminal
- Fault-tracing information
- Checking pulsed secondary air injection system (PAIR) valve
- Checking pulsed secondary air injection system (PAIR) pipe
- Cleaning
- Checking vacuum hoses
- Check
- Checking lilac hose
- Replacing Solenoid Valve
- Repairing hose
- Checking pulsed secondary air injection system (PAIR) hose
- Replacing Pulsed Secondary Air Injection System (PAIR) Valve
- Checking hoses
- Replacing Faulty Hoses
- Verification
- Information
- EFI-448: Pulsed Secondary Air Injection System (Pair) Pump. Leakage. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-448: Pulsed Secondary Air Injection System (Pair) Pump. Leakage. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-451: Misfire Cylinder 1 (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-45X, EFI-543, EFI-545, EFI-55X
- Misfire in one cylinder
- Notes
- Checking spark plugs
- Replacing fuel injector
- Checking compression
- Replacing Spark Plugs
- Checking cooling system
- Checking ignition cables
- Checking distributor cap and rotor
- Checking flywheel/pulse wheel
- Checking for damage
- Checking injector cables and terminals
- Checking for air leakage
- Checking fuel and residual pressures
- Information
- Injector valve, replacement
- EFI-452: Misfire Cylinder 2 (B5234T3; B5254T; 1998)
- EFI-453: Misfire Cylinder 3 (B5234T3; B5254T; 1998)
- EFI-454: Misfire Cylinder 4 (B5234T3; B5254T; 1998)
- EFI-455: Misfire Cylinder 5 (B5234T3; B5254T; 1998)
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Missing. Intermittent Fault. (B5234T3; B5254T; 1998)
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Missing. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-514
- Signal missing. Permanent fault
- Notes
- Checking power cable
- Checking for an open-circuit
- Checking the signal cable
- Checking control module connector
- Checking for contact resistance and oxidation
- Checking signal cable, high-speed
- Checking for a short-circuit
- Checking engine cooling fan (FC) relay
- Replacing Engine Cooling Fan (FC) Relay
- Verification
- Information
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-514: Engine Cooling Fan (FC), Low-Speed. Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-521: Front Heated Oxygen Sensor (Ho2S). Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-521: Front Heated Oxygen Sensor (Ho2S). Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-521: Front Heated Oxygen Sensor (Ho2S). Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-521: Front Heated Oxygen Sensor (Ho2S). Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-521, EFI-522
- Signal too low. Permanent fault
- Notes
- Checking power cable
- Checking for an open-circuit
- Checking the signal cable
- Checking for a short-circuit
- Checking signal cable resistance to ground
- Checking signal cable resistance
- Checking heated oxygen sensor (HO2S)
- Checking connector
- Replacing Heated Oxygen Sensor (HO2S)
- Connecting breakout box, connector A
- Verification
- Information
- EFI-522: Rear Heated Oxygen Sensor (Ho2S). Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-522: Rear Heated Oxygen Sensor (Ho2S). Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-522: Rear Heated Oxygen Sensor (Ho2S). Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-522: Rear Heated Oxygen Sensor (Ho2S). Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- EFI-532: Ignition Discharge Module (IDM) Group B. Faulty Signal (B5234T3; B5254T; 1998)
- EFI-533: Ignition Discharge Module (IDM), Group C. Faulty Signal (B5234T3; B5254T; 1998)
- EFI-541: Canister Purge (Cp) Valve. Signal Missing. Intermittent Fault. (B5234T3; B5254T; 1998)
- EFI-541: Canister Purge (Cp) Valve. Signal Missing. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-541
- Signal missing. Permanent fault
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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.