AftertreatmentCaterpillar Diesel ECM

SPN 1761 FMI 17

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 1761-17 commonly relates to diesel exhaust fluid level or a DEF level signal that is below the expected range. On a Tier 4 or EPA emissions engine, the ECM needs reliable DEF level information before it can allow normal SCR operation. When this code is active, the machine or truck may display a DEF warning, limit regeneration or SCR operation, and eventually enter an inducement or derate if ignored. A technician should confirm the actual DEF level and then verify whether the level sensor and wiring are reporting correctly.

Likely Causes

Low DEF level; DEF level sensor fault; damaged DEF tank harness; corroded connector; contaminated DEF tank header; poor power or ground to DEF components.

What To Check First

Physically confirm DEF level, inspect the DEF tank/header connector, compare the displayed DEF level to actual tank level, and check for related DEF quality, DEF pump, or inducement codes.

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Related Aftertreatment Fault Codes

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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.

SPN 3719 FMI 0

CAT fault code 3719-0 is generally an aftertreatment soot-load or DPF restriction code at a high-severity level.

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