SPN 102 - FMI 3 (Fault Code 122)
Friday, July 20, 2018
Fault Codes CUMMINS GTA38 K38 K50 QSK38 QSK50/60 CM850,
Fault Codes CUMMINS Signature ISX QSX15 CM570
SPN102 FMI3
Intake Manifold 1 Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
CODES:
Fault Code: 122
PID(P), SID(S): P102
SPN: 102
FMI: 3/3
Lamp: Amber
REASON: High signal voltage detected at the intake manifold pressure circuit.
EFFECT: Engine power derate.
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 is located in the air intake horn.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
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 and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
• A default value of the intake manifold pressure reading is used.
• 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:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• 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 battery voltage.
Read More:
SPN 91 - FMI 3 (Fault Code 131)
SPN 102 - FMI 4 (Fault Code 123)
Blog.Teknisi
Intake Manifold 1 Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
 |
| Intake Manifold Pressure Sensor Circuit |
CODES:
Fault Code: 122
PID(P), SID(S): P102
SPN: 102
FMI: 3/3
Lamp: Amber
REASON: High signal voltage detected at the intake manifold pressure circuit.
EFFECT: Engine power derate.
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 is located in the air intake horn.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
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 and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
• A default value of the intake manifold pressure reading is used.
• 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:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• 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 battery voltage.
Read More:
SPN 91 - FMI 3 (Fault Code 131)
SPN 102 - FMI 4 (Fault Code 123)
Blog.Teknisi
0 Response to "SPN 102 - FMI 3 (Fault Code 122)"
Post a Comment