How to Solve QSK60 CM2358 Engine Fault Code 122

Here is the instruction show you guide on how to solve QSK60 CM2358 engine fault code 122 Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source.

Related Contents:

INSITE 8.9.2 Engine Diagnostic Software

Cummings INLINE 6 Diagnostic Adapter

 

 

CODE

Fault Code: 122

PID: P102

SPN: 102

FMI: 3/3

LAMP: Amber

SRT:

 

REASON

High signal voltage detected at the intake manifold pressure circuit.

 

EFFECT

Possible reduced engine performance.

 

 

Circuit Description

The engine control module (ECM) provides a 5 volt supply to the intake manifold pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The intake manifold pressure sensor provides a signal to the ECM on the intake manifold pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the intake manifold.

 

Component Location

The intake manifold pressure sensor 1 is located in intake manifold 1.

 

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position.

 

Conditions for Setting the Fault Codes

The Engine Control Module (ECM) detected the intake manifold pressure signal voltage was out of range high.

 

Action Taken When the Fault Code is Active

The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

A default value of the intake manifold pressure reading is used.

Diesel exhaust fluid injection into the aftertreatment system is disabled.

Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

 

Conditions for Clearing the Fault Code

Turn the keyswitch OFF. Allow the ECM to completely power down and turn the keyswitch ON.

The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.

The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.

The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

 

Shop Talk

The intake manifold pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 122, check for multiple faults.

 

Possible causes of this fault code include:

Open return circuit in the harness, connectors, or sensor

Signal wire shorted to sensor supply or ECM supply voltage.

A malfunctioning intake manifold pressure sensor

 

More repair case for QSK60 CM2358,please refer to QSK60 CM2358 Trouble Repair