Bosch ECU Troubleshooting

This is a general error indicating a problem within the Electronic Control Unit (ECU) itself. It means one or more internal components or functions are not working correctly.

Neither the crankshaft nor the camshaft position sensor is providing a signal. This prevents the engine from starting.

The breather heater circuit has been disconnected or has an open circuit. This means the heater is not receiving power.

The breather heater circuit is shorted to ground. This means the heater's electrical path is unintentionally connected to the chassis or ground.

The breather heater circuit is shorted to the battery voltage (VB). This indicates an unintended connection between the heater circuit and the main power supply.

The voltage signal from the first accelerator position sensor is too low. This could be due to a faulty sensor or a problem with the wiring.

The voltage signal from the first accelerator position sensor is too high. This indicates a potential issue with the sensor or its wiring.

This error means the system is unable to read data from the ECU's internal memory (EEPROM). This prevents the ECU from accessing necessary operating data.

This indicates that the system cannot write new data to the ECU's internal memory (EEPROM). This can occur during updates or when settings need to be saved.

The voltage signal from the second accelerator position sensor is too low. This may indicate a sensor fault or a wiring problem.

The voltage signal from the second accelerator position sensor is excessively high. This suggests a fault in the sensor or its associated wiring.

The voltage from accelerator sensor 3 is too low. This may be due to a faulty sensor or a wiring issue.

The voltage from accelerator sensor 3 is too high. This suggests a fault within the sensor or a short in its wiring.

There is an error with the signal from the crankshaft position sensor. This sensor is crucial for engine timing and ignition.

The system is not receiving any signal from the crankshaft position sensor. This will prevent the engine from starting or running.

An error has been detected with the signal from the camshaft position sensor. This sensor helps synchronize engine timing.

The camshaft position sensor is not sending any signal. This can lead to incorrect engine timing and starting problems.

This error indicates an issue with the internal memory (EEPROM) of the ECU, specifically that it has been deleted or corrupted. This can affect the proper functioning of the system.

The ECU has detected an internal problem and has shut down operation 1 as a safety measure. This prevents potential damage or malfunction.

Similar to P1031, the ECU has identified an internal abnormality and initiated shut down of operation 2 for safety. This indicates a specific internal fault.

The ECU has detected an internal fault and has shut down operation 3 to ensure safe operation. This is a protective measure against internal ECU malfunction.

This error signifies that the ECU has identified an internal problem and has shut down operation 4. This indicates a specific internal issue requiring attention.

This error means the shutoff path is malfunctioning due to an abnormality detected between the external monitoring IC and the CPU. This impacts the system's safety functions.

This alarm indicates that the air cleaner element is clogged and restricting airflow. The system may reduce performance or shut down.

Accelerator sensor 3 is reporting an error when the foot pedal is in the closed (idle) position. This suggests a problem with the sensor or its reading at idle.

Accelerator sensor 3 reports an issue when the foot pedal is in the fully open position. This points to a problem with the sensor or its reading at full throttle.

This alarm signifies that the water separator has reached its capacity and needs to be drained. Water in the fuel can cause engine problems.

The oil pressure switch circuit is open, meaning there is no continuity. This could indicate a faulty switch or a wiring issue.

This alarm indicates that the engine oil pressure is below the acceptable minimum level. Low oil pressure can cause serious engine damage.

This error signifies a problem with the pulse communication from the accelerator sensor. The system is not interpreting the pulse signals correctly.

This error indicates an incorrect phase or angle difference detected between the crankshaft and camshaft position signals. This can affect engine performance and timing.

This error signifies a short circuit to ground in the control circuit for the third actuator. This will likely cause the third actuator to not operate.

This indicates a problem with the Analog-to-Digital (AD) converter circuit 1 within the ECU. This circuit is used to convert analog sensor signals into digital data.

This error points to a malfunction in the second Analog-to-Digital (AD) converter circuit of the ECU. This impacts the processing of analog sensor data.

This error indicates a communication or functional problem between the external monitoring integrated circuit (IC) and the main CPU within the ECU for the first channel.

This code signifies a fault in the communication or operation between the external monitoring IC and the CPU for the second channel of the ECU.

This error indicates a problem with the Read-Only Memory (ROM) within the ECU. The ROM stores critical operating software and data.

The ECU has detected a fault in the first shutoff path, which is a safety mechanism. This prevents the system from operating to avoid potential hazards.

This indicates a fault in the second shutoff path, a critical safety system within the ECU. Operation is halted to prevent risks associated with this fault.

The ECU has detected an issue with the third shutoff path, disabling operation as a safety precaution. This points to a problem within this specific safety circuit.

This code indicates a problem with the fourth shutoff path within the ECU, triggering a system shutdown for safety. This fault relates to a specific internal safety circuit.

A fault has been detected in the fifth shutoff path of the ECU, causing it to shut down operation. This is a safety measure due to an internal issue.

This error message indicates a problem with the sixth shutoff path within the ECU, leading to a safety shutdown. This specific path is not functioning correctly.

The ECU has detected a fault in the seventh shutoff path and has initiated a shutdown for safety. This indicates a specific failure within this protective circuit.

This error signifies a fault in the eighth shutoff path of the ECU, causing a system shutdown as a safety measure. The issue lies within this specific safety circuit.

The ECU has detected an issue with the ninth shutoff path, triggering a safety shutdown. This points to a problem within this particular protective circuit.

This error indicates a fault in the tenth shutoff path within the ECU, leading to a safety shutdown. The issue is specifically with this safety circuit.

The system is unable to correctly recognize or process the engine speed signal. This can affect engine control and performance.

The charge switch circuit is open, meaning it is not making contact or the connection is broken. This can prevent proper charging or system operation.

This is a general alarm related to the charging system. It could indicate various issues preventing proper charging.

This error means that the voltage supplied to a specific part of the ECU (supply 1) is too high. Overvoltage can damage sensitive electronic components.

This code indicates a problem with the voltage supplied to one of the ECU's sensors (sensor supply 1). Incorrect voltage can lead to inaccurate sensor readings.

This error points to a communication problem between the ECU and another component using the SPI (Serial Peripheral Interface) protocol. This can disrupt data exchange.

This error indicates that the voltage supplied to a specific part of the ECU (supply 1) is too low. Insufficient voltage can prevent the ECU from operating correctly.

This error relates to an incorrect voltage being supplied to a different sensor (sensor supply 2). The ECU relies on correct sensor voltages for accurate data.

This code indicates a voltage issue with the power supply to a third sensor (sensor supply 3). Proper voltage is critical for sensor accuracy.

This error means that the electrical circuit used to control an actuator (drive circuit 1) has a short circuit to ground. This can cause the actuator to malfunction or fail.

This fault indicates a short circuit to ground in the drive circuit for the second actuator. This prevents the actuator from functioning correctly.

This error occurs when the dual accelerator sensors report an issue while the pedal is in the closed (idle) position. It suggests a mismatch or fault.

This error indicates a problem with the dual accelerator sensors when the pedal is in the open (accelerated) position. It points to a discrepancy or sensor failure.