AftertreatmentCaterpillar Diesel ECM

SPN 3487 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 3487-5 commonly points to an ARD or aftertreatment circuit with low current or an open circuit. The affected component may be part of the air, fuel, or ignition side of the regeneration system. A failure here can cause incomplete regeneration and rising DPF soot load. The code should be diagnosed as an electrical circuit issue first, then followed by a regeneration performance test once repaired.

Likely Causes

Open circuit; failed ARD valve or solenoid; unplugged connector; broken wire; blown fuse; poor power or ground; connector corrosion.

What To Check First

Locate the component tied to SPN 3487 in Cat ET, inspect the connector, test continuity and resistance, and run an ARD service test after repair.

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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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