Overview

Code

Fault Code: 1977

PID: S382

SPN: 3556

FMI: 5/5

LAMP: Amber

SRT:    

Reason

High resistance, short circuit, or open circuit detected on the aftertreatment fuel injector circuit..

Effect

Possible reduced engine performance

Aftertreatment Fuel Injector Circuit

Circuit Description

The aftertreatment fuel injector is electronically controlled by the engine electronic control module (ECM) through a pulse width modulated (PWM) signal. The amount of fuel injected is determined by how long the PWM signal to the injector is on.

Component Location

The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.

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 a circuit error within the aftertreatment fuel injector circuit.

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.

Active regeneration of the aftertreatment diesel particulate filter will be disabled unitl the next key cycle.

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, start the engine and perform the recommended Cummins electronic service tool or equivalent Aftertreatment Diesel Particulate Filter Regeneration Test.
• 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.
• For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where 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, as well as extinguish the MIL for OBD applications.

Shop Talk

Possible causes of this fault code include:

An open circuit in the supply or return wire in the engine harness

An open circuit in the aftertreatment fuel injector solenoid

A short circuit to ground in the engine harness

A short circuit to voltage source in the engine harness

High resistance in the aftertreatment fuel injector solenoid

An extremely low resistance in the aftertreatment fuel injector solenoid

Contact Us

Whatsapp: +84.858.966.333
Facebook: VIETVehicle Remote Delete Service
YouTube: VIETVehicle – ECM Delete Tuning
Tiktok: VIETVehicle.com
Website: VIETVehicle.com