AftertreatmentCaterpillar Diesel ECM

SPN 3484 FMI 5

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

DPF, DEF, SCR, and NOx-reduction system faults.

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System

Caterpillar Aftertreatment

Caterpillar ECM Service

Diagnostic Overview

CAT fault code 3484-5 is generally an aftertreatment or ARD control circuit fault where current is below normal or the circuit is open. The ECM may be unable to operate a valve, actuator, or controlled device needed during regeneration. This can prevent the DPF from cleaning properly and may lead to additional soot-load codes. The repair should start with the circuit and connector checks rather than replacing major aftertreatment parts.

Likely Causes

Open circuit; disconnected ARD component; failed solenoid or valve; damaged harness; blown fuse; poor ground; corroded connector.

What To Check First

Use Cat ET to identify the exact component, inspect the harness and connector, test resistance/continuity, and verify power and ground.

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Related Aftertreatment Fault Codes

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SPN 1761 FMI 17

CAT fault code 1761-17 commonly relates to diesel exhaust fluid level or a DEF level signal that is below the expected range.

SPN 3360 / SPN 3820

CAT codes listed as 3360/3820 generally point toward the DEF supply, DEF quality, DEF tank, or SCR dosing system depending on the exact FMI shown in Cat ET.

SPN 3361 / SPN 3821

CAT codes listed as 3361/3821 commonly belong to the DEF dosing or SCR control side of the aftertreatment system.

SPN 3474 FMI 31

CAT fault code 3474-31 is typically associated with aftertreatment regeneration or ARD-related operation.

SPN 3701 FMI 15

CAT fault code 3701-15 commonly indicates an aftertreatment condition that is above normal but at a least-severe level, often connected with DPF soot load, regeneration need, or aftertreatment restriction.

SPN 3701 FMI 16

CAT fault code 3701-16 usually represents a more serious aftertreatment condition than 3701-15, with the measured or calculated value above normal at a moderate severity level.

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