SPN 102 - FMI 4 (Fault Code 123)
Friday, July 20, 2018
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SPN102 FMI4
Intake Manifold 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 123
PID(P), SID(S): P102
SPN: 102
FMI: 4/4
Lamp: Amber
REASON: Low signal voltage or open circuit 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 is located in the air intake horn.
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 low.
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.
• Diesel exhaust fluid injection into the aftertreatment system is disabled.
• Active and stationary regeneration of the diesel particulate filter will be disabled.
• 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 123, check for multiple faults.
Possible causes of this fault code include:
• Signal circuit open or shorted to ground in the engine harness or sensor
• Supply wire open or shorted to ground.
Read More:
SPN 91 - FMI 4 (Fault Code 132)
SPN 91 - FMI 3 (Fault Code 131)
Blog.Teknisi
Intake Manifold 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
 |
| Intake Manifold Pressure/Temperature Sensor Circuit |
CODES:
Fault Code: 123
PID(P), SID(S): P102
SPN: 102
FMI: 4/4
Lamp: Amber
REASON: Low signal voltage or open circuit 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 is located in the air intake horn.
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 low.
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.
• Diesel exhaust fluid injection into the aftertreatment system is disabled.
• Active and stationary regeneration of the diesel particulate filter will be disabled.
• 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 123, check for multiple faults.
Possible causes of this fault code include:
• Signal circuit open or shorted to ground in the engine harness or sensor
• Supply wire open or shorted to ground.
Read More:
SPN 91 - FMI 4 (Fault Code 132)
SPN 91 - FMI 3 (Fault Code 131)
Blog.Teknisi
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