Section 77 (Electronic Fuel Injection (EFI) DTCS, Ignition And Control Systems - Diagnostic Procedures (Coupe))
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
- EFI-621 Fuel Tank Pressure Sensor, Signal. Signal Sporadic. Permanent Fault (B5234T3; B5254T; 1998)
- Signal sporadic. Permanent fault
- Notes
- Checking and replacing fuel tank pressure sensor
- Identification
- Safety
- Checking diagnostic trouble codes (DTCs)
- Fault-tracing information
- Checking cables and terminals
- Checking the air conditioning (A/C) pressure sensor
- Replacing air conditioning (A/C) pressure sensor
- Checking accelerometer
- Replacing accelerometer
- Checking atmospheric pressure sensor
- Replacing atmospheric pressure sensor
- Replacing fuel tank pressure sensor
- Signal sporadic: Permanent fault
- Notes
- Checking diagnostic trouble codes (DTCs)
- Fault-tracing information
- Checking cables and terminals
- Checking the air conditioning (A/C) pressure sensor
- Replacing air conditioning (A/C) pressure sensor
- Checking accelerometer
- Replacing accelerometer
- Checking atmospheric pressure sensor
- Replacing atmospheric pressure sensor
- Verification
- Information
- Signal sporadic. Permanent fault
- EFI-621 Fuel Tank Pressure Sensor, Signal. Signal Too High. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-621 Fuel Tank Pressure Sensor, Signal. Signal Too High. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-621
- Signal too high. Permanent fault
- Notes
- Checking fuel tank pressure sensor
- Signal too high. Permanent fault
- Notes
- Checking ground lead
- Checking connector 24/4
- Fault-tracing information
- Checking ground lead between connector 24/4 and fuel tank pressure sensor
- Checking for a short-circuit
- Checking connector 24/2
- Checking ground lead between connectors 24/2 and 24/4
- Checking control module connector
- Checking for an open-circuit
- Checking the signal cable
- Checking signal cable between connector 24/4 and fuel tank pressure sensor
- Checking signal cable between connector 24/4 and 24/2
- Checking fuel tank pressure sensor
- Replacing fuel tank pressure sensor
- Checking for contact resistance and oxidation
- Verification
- Information
- EFI-621 Fuel Tank Pressure Sensor, Signal. Signal Too Low. Intermittent Fault (B5234T3; B5254T; 1998)
- EFI-621 Fuel Tank Pressure Sensor, Signal. Signal Too Low. Permanent Fault (B5234T3; B5254T; 1998)
- Diagnostic trouble code (DTC) information EFI-621
- Signal too low. Permanent fault
- Notes
- Checking fuel tank pressure sensor
- Identification
- Safety
- Checking power cable
- Checking accelerometer
- Replacing accelerometer
- Checking the air conditioning (A/C) pressure sensor
- Replacing air conditioning (A/C) pressure sensor
- Checking atmospheric pressure sensor
- Replacing atmospheric pressure sensor
- Checking short-circuit
- Checking connector
- Checking cable
- Checking the signal cable
- Replacing fuel tank pressure sensor
- Signal too low. Permanent fault
- Notes
- Checking power cable
- Checking power cable resistance
- Checking connector 24/4
- Fault-tracing information
- Checking power cable between connector 24/4 and fuel tank pressure sensor
- Checking for a short-circuit
- Checking connector 24/2
- Checking power cable between connector 24/4 and 24/2
- Checking for an open-circuit
- Checking control module connector
- Checking power cables
- Checking cable between 24/2 and 24/4
- Checking the signal cable
- Checking signal cable resistance to ground
- Checking signal cable between connector 24/4 and fuel tank pressure sensor
- Checking signal cable between connector 24/4 and 24/2
- Checking signal cable between fuel tank pressure sensor and connector 24/4
- Checking fuel tank pressure sensor
- Replacing fuel tank pressure sensor
- Checking for contact resistance and oxidation
- Verification
- Information
- Services (B5234T3; B5254T; 1998)
- Parameter read-out - graphical presentation, Motronic 4.4
- Reading off Motronic 4.4 diagnostic trouble codes (DTCs)
- Connecting
- Reading DTCs
- Connecting the Volvo Scan Tool (ST)
- Communication problems
- Communication failure
- Communication problems with Volvo Scan Tool (ST)
- Starting the engine
- Checking power supply
- Checking data link connector (DLC) power supply
- Checking fuse 15
- Checking for a short-circuit
- Checking voltage before the fuse
- Checking for an open-circuit
- Checking power ground to the data link connector (DLC)
- Checking data link connector (DLC) signal ground
- Checking supply voltage to adapter box
- Fault-tracing information
- Checking power ground to the adapter box
- Checking adapter box signal ground
- Checking supply voltage to Volvo Scan Tool (ST)
- Checking ground to Volvo Scan Tool (ST)
- Checking communication with the ABS system
- Checking communication cable to data link connector (DLC)
- Checking the communication cable
- Checking communication cable to adapter box
- Replacing Volvo Scan Tool (ST) wiring
- Checking communication with the Volvo Scan Tool (ST)
- Checking communication with the Volvo Scan Tool (ST), continued
- Replacing adapter box
- Replacing Volvo Scan Tool (ST)
- Checking immobilizer
- Checking diagnostic trouble codes (DTCs) in the immobilizer
- Checking fuse 1
- Checking 15-supply before fuse
- Checking 15-supply from ignition switch
- Replacing ignition switch
- Checking voltage to ignition switch
- Checking 15 supply after the fuse
- Checking 30 supply
- Checking power supply from main relay
- Checking signals
- Checking voltage to main relay terminal 4
- Checking voltage to main relay terminal 2
- Checking control signal to main relay
- Checking voltage from main relay
- Checking the signal cable
- Replacing main relay
- Connecting breakout box (connector B)
- Connecting breakout box, connector A
- Fault-tracing information
- Check For Air Leaks In The Intake System (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Camshaft Adjustment (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Compression (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Engine Coolant Temperature (ECT) Sensor (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Engine Speed (Rpm) Sensor Interference (1999-2002)
- Checking For Air Leakage In The Exhaust System (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Fuel And Residual Pressures (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Ignition Spark (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Injectors (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Spark Plugs (B5234T3; B5244T; B5254T; 1999-2002)
- Checking The Air Conditioning (A/C) System (B5234T3; B5244T; B5254T; 1999-2002)
- Checking The Fuel Pump (FP) (B5234T3; B5244T; B5254T; 1999-2002)
- Checking The Status Of The Pedal Position Sensor (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Thermostat (B5234T3; B5244T; B5254T; 1999-2002)
- Checking Three-Way Catalytic Converter (TWC) And Exhaust System (B5234T3; B5244T; B5254T; 1999-2002)
- Oil Consumption (B5234T3; B5244T; 1999-2000)
- Readiness Code (B5234T3; B5244T; B5254T; 1999-2000)
- Resetting Adaptation Values (B5234T3; B5244T; B5254T; 1999-2002)