Volvo All Engines (2004 Emissions) Fault Code: SID 232 FMI 4 Sensor Supply Voltage #1

Fault Condition: The Electronic Malfunction Lamp (EML) will turn on and code SID 232 will set when the reference voltage to the Electronic Fan Controller, Boost Pressure Sensor and Intake Air Temperature and Humidity Sensor is less than 4.5 volts or greater than 5.5 volts. If the voltage returns to 4.5 volts to 5.5 volts, the fault will become inactive.

Possible repairs:

Turn the ignition key OFF first.

1) If code SID 232 is NOT set, wiggle the harness and connectors to try to set the code. Visually inspect the EMS Module connectors for frayed wires and loose or corroded connections.
2) Disconnect EMS Module connector A. Disconnect the Electronic Fan Controller, Boost Pressure Sensor and Intake Air Temperature and Humidity Sensor harness connectors. Check for continuity between EMS Module harness connector A, pin 7 and a good ground. If continuity exists, locate and repair the short circuit to ground.
3) Disconnect EMS Module connector A. Turn the ignition key ON. Measure the voltage between EMS Module connector A pin 7 and a good ground. If voltage is present, locate and repair the short circuit to voltage in circuit.
4) Disconnect EMS Module connector A. Disconnect the Electronic Fan Controller, Boost Pressure Sensor and Intake Air Temperature and Humidity Sensor harness connectors. Check for continuity between EMS Module
harness connector A, pin 7 and a pin 1 of the Electronic Fan Controller, Boost Pressure Sensor and Intake Air Temperature and Humidity Sensor connectors. If there is NO continuity, locate and repair the open in the circuit.
5) Disconnect EMS Module connector A. Visually inspect both sides of EMS Module connector A. If a repairable short circuit or damaged pins are found, repair or replace the harness connector.
6) Connect EMS Module connector A. Connect the Electronic Fan Controller, Boost Pressure Sensor and Intake Air Temperature and Humidity Sensor harness connectors. Start the engine and recheck for codes. If code SID 232 is still active, replace the EMS Module and retest the system. If code SID 232 is not active, the diagnostic procedures have corrected the problem. Check all connectors to ensure proper connections.