CLAAS 778Bh: Low Reference Voltage (5V) for Sensors in 04 ENG (A15)

The reference voltage (5V) for pressure, temperature, and water presence sensors in the 04 ENG (A15) system is low. The ENG (A15) engine calculator is attempting to operate normally despite this condition.

1. 1

   Power supply to the 04 ENG (A15) system

2. 2

   Connections and wiring for the pressure, temperature, and water presence sensors

3. 3

   Voltage levels at the sensor inputs

1. 1

   Check the power supply to the 04 ENG (A15) system.

   Ensure that the power source is providing stable voltage and that all fuses or circuit breakers are intact.

2. 2

   Inspect the wiring and connections for the pressure, temperature, and water presence sensors.

   Look for loose, damaged, or corroded connections that may be causing a voltage drop.

3. 3

   Measure the voltage at the sensor inputs.

   Use a multimeter to verify that the reference voltage (5V) is present at the sensor terminals.