SPN 1043 - FMI 4 (Fault Code 284)
Saturday, July 14, 2018
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SPN1043 FMI4
Engine Speed/Position Sensor (Crankshaft) Supply Voltage Circuit - Voltage below normal, or shorted to low source
CODES:
Fault Code: 284
PID(P), SID(S): S221
SPN: 1043
FMI: 4/4
Lamp: Amber
REASON: Low voltage detected on the +5 volt sensor supply circuit to the engine speed sensor.
EFFECT: Engine may run rough, may stop running, may not start, or may be difficult to start.
Circuit Description:
The engine speed sensors are Hall effect type sensors. The engine control module (ECM) provides a 5 volt supply to the speed sensor and a return circuit. As the teeth on the crankshaft speed ring move past the speed sensor, a signal is generated on the speed sensor signal circuit. The ECM interprets this signal and converts it to an engine speed.
Component Location:
The engine speed sensor is located in the lower portion of the front cover on the intake side of the engine.
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 engine speed sensor supply 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.
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:
Possible causes of this fault code include:
• Tampering of the engine speed/position sensors.
-A damaged vehicle speed sensor.
-Look for intermittent engine harness connections in the primary engine speed sensor circuit.
Read More:
SPN 639 - FMI 9 (Fault Code 285)
SPN 639 - FMI 13 (Fault Code 286)
Blog.Teknisi
Engine Speed/Position Sensor (Crankshaft) Supply Voltage Circuit - Voltage below normal, or shorted to low source
 |
| Sensor Supply Voltage |
CODES:
Fault Code: 284
PID(P), SID(S): S221
SPN: 1043
FMI: 4/4
Lamp: Amber
REASON: Low voltage detected on the +5 volt sensor supply circuit to the engine speed sensor.
EFFECT: Engine may run rough, may stop running, may not start, or may be difficult to start.
Circuit Description:
The engine speed sensors are Hall effect type sensors. The engine control module (ECM) provides a 5 volt supply to the speed sensor and a return circuit. As the teeth on the crankshaft speed ring move past the speed sensor, a signal is generated on the speed sensor signal circuit. The ECM interprets this signal and converts it to an engine speed.
Component Location:
The engine speed sensor is located in the lower portion of the front cover on the intake side of the engine.
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 engine speed sensor supply 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.
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:
Possible causes of this fault code include:
• Tampering of the engine speed/position sensors.
-A damaged vehicle speed sensor.
-Look for intermittent engine harness connections in the primary engine speed sensor circuit.
Read More:
SPN 639 - FMI 9 (Fault Code 285)
SPN 639 - FMI 13 (Fault Code 286)
Blog.Teknisi
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