Cummins ISX11.9 CM2250 (2010-12) Fault Code: 1656 PID: SPN: 1325 FMI: 31 Engine Misfire Cylinder 3- Condition Exists
Circuit Description
An algorithm in the ECM calibration monitors engine speed as each injector fires while the engine is at idle. If a cylinder has high or low contribution to engine speed, this fault will become active. The intention of this fault is to assist in troubleshooting performance complaints such as engine misfire and low power.
Component Location
The ECM is located on the intake side of the engine.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine coolant temperature is greater than 71?C [160?F].
Conditions for Setting the Fault Codes
If cylinder 3 has high or low contribution to engine speed, this fault will become active.
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, start the engine and let it idle for up to 5 minutes.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
For On-Board Diagnostic (OBD) engines, the ECM will turn off the MIL after three consecutive trips where the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications
Shop Talk
If Fault Code 1656 is inactive in the ECM memory and there is no complaint such as ?low power? or ?engine misfire?, it is possible that an intermittent event, such as air entering the fuel system following a filter change caused the fault. Inactive counts of Fault Code 1656 should be disregarded unless other performance symptoms are present. The coolant temperature must be greater than 71?C [160?F] before this diagnostic will run.
Causes of cylinder misfire can include:
Valve lash out of specification (compare actual valve lash to reset limits)
Cylinder malfunction (check for high blowby when the engine is loaded)
Valve malfunction or valve held open (listen for intake valve ?chirping? noise in the intake)
Cylinder head or gasket malfunction (look for signs of oil, coolant, or casting flash in the intake or exhaust passages)
Extreme camshaft wear (inspect the camshaft lobes for wear)
Extra, missing, or damaged sealing washer under an injector
Injector malfunctions (?swap? injectors to see if the problem ?follows? the indicated injector).
Check air compressor timing (if engine has had fault since new or has had a recent air compressor replacement).
Possible Cause:
1) Cylinder Misfire
2) ECM calibration
Related
-
Eaton Service Ranger 4.9 Engineering 4.9 [05.2021] Engineering Level ( 1 PC )
Eaton $67.00Rated 0 out of 5 -
premium volvo tech tool update 2.8.150 diagnostic software 1pc
Trucks software $150.00Rated 0 out of 5 -
Volvo Impact 2021 Trucks & Buses 06.2021 DVD 9116 Spare Parts Catalog
Trucks software $55.00Rated 0 out of 5 -
Hino Diagnostic eXplorer 2 – Hino DX2 1.1.19.1 with keygen unlocked ( Hino trucks )
Hino $50.00Rated 0 out of 5 -
Scania SDP3 2.48.6 Diagnosis & Programming for VCI 3 VCI3 without Dongle
Scania $30.00Rated 0 out of 5 -
JOHN DEERE SERVICE ADVISOR 5.3.225 DATABASE AG + CF ENGLISH 2023
John Deere $250.00Rated 0 out of 5 -
2021 VOLVO PREMIUM TECH TOOL PTT V2.8.21 VCADS+DEVELOPER TOOL+APCI 2021/09 ( 1 PC )
Trucks software $85.00Rated 0 out of 5
Related products
-
Allison 1000 & 2000 Gen 4 Fault Codes: P0870 Transmission Pressure Switch Solenoid E Circuit
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: U2105 CAN Bus ECM Error
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P2773 Torque Control Request Ignored – ECM/TCM
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P1891 Engine Throttle Position Sensor Pulse Width Modulation (PWM) Signal Low Input
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P0872 Transmission Pressure Switch Solenoid E Circuit Stuck Closed
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: U1300 J1850 (Class 2) Serial Data Communication Link Low
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P1892 Throttle Position Sensor Pulse Width Modulation (PWM) Signal High Input
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: U0100 CAN Bus ECM Error
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: U1064 J1850 (Class 2) TBC Controller State of Health Failure
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P1688 Unmanaged Engine Torque Delivered To TCM Signal
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P0848 Transmission Pressure Switch Solenoid D Circuit High
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 P0719 Brake Switch ABS Input Low
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P0876 Transmission Reverse Pressure Switch Circuit Stuck Open
1000 & 2000 Gen 4 $50.00Rated 0 out of 5 -
Allison 1000 & 2000 Gen 4 Fault Codes: P1779 Engine Torque Delivered To TCM Signal
1000 & 2000 Gen 4 $50.00Rated 0 out of 5