The QSK CM2358 is a powerful engine used in various applications. However, like any other complex system, it is susceptible to faults and errors. One common issue is Fault Code 122, which indicates an error in the intake manifold 1 pressure sensor circuit. This article will delve into the possible causes of this fault code and provide insights on troubleshooting and repair.
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INSITE 8.9.2 Engine Diagnostic Software
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Understanding the Fault Code:
QSK CM2358 engines are equipped with an engine control module (ECM) that monitors various sensors to ensure optimal performance. The intake manifold pressure sensor measures the pressure in the intake manifold and sends a corresponding voltage signal to the ECM. When Fault Code 122 is triggered, the ECM detects a voltage above normal or a short to a high source in the intake manifold pressure sensor circuit.
Effects of the Fault Code:
When the fault code is active, the ECM illuminates the CHECK ENGINE lamp, and the engine may experience reduced performance. Additionally, the injection of diesel exhaust fluid into the aftertreatment system is disabled as a precautionary measure. Prolonged operation with this fault can even lead to a reduction in engine torque.
Potential Causes:
Several factors can contribute to the occurrence of Fault Code 122. These include:
1. Open return circuit: A break in the wiring harness, connectors, or sensor can interrupt the return circuit, causing the fault code.
2. Signal wire shorted: If the signal wire is shorted to the sensor supply or ECM supply voltage, it can result in erroneous readings and trigger the fault code.
3. Malfunctioning intake manifold pressure sensor: Sometimes, the sensor itself may be faulty, producing incorrect voltage signals and leading to the fault code.
Troubleshooting and Repair:
To address Fault Code 122, it is essential to follow a systematic troubleshooting approach and consult the appropriate technical resources. Here are some general steps to consider:
1. Check for multiple faults: Before focusing solely on Fault Code 122, it is crucial to check for any other active fault codes related to the engine harness or sensors.
2. Inspect the wiring harness: Examine the wiring harness, connectors, and sensor for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components as necessary.
3. Perform sensor testing: Use diagnostic tools such as the Cummings INLINE 6 Diagnostic Adapter and INSITE 8.9.2 Engine Diagnostic Software to test the intake manifold pressure sensor. Follow the manufacturer’s guidelines and compare the readings with specifications to determine if the sensor is functioning correctly.
4. Clear the fault code: Once the necessary repairs or replacements are made, turn off the keyswitch and allow the ECM to power down completely. Then, turn the keyswitch back on to clear the fault code. Use the recommended electronic service tool or equivalent to ensure the fault code is marked as inactive.
Conclusion:
Fault Code 122 in the QSK CM2358 engine points to an issue with the intake manifold 1 pressure sensor circuit. By understanding the causes and following proper troubleshooting procedures, technicians can diagnose and rectify the problem effectively. It is crucial to consult official repair manuals and utilize the appropriate diagnostic tools to ensure accurate diagnosis and repair.
More repair case for QSK60 CM2358, please refer to Cummins Trouble Repair