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Caterpillar EUI Engine

The Caterpillar EUI is an engine. It powers generator sets from Caterpillar, including the BRK1-Up, CAL1-Up, CMC1-Up and CNB1-Up.

Also known as: Caterpillar EUI Engine

On this pageSpecs Generator sets FAQ Torque & specs Fault codes Procedures

Engine specifications

Generator sets powered by this engine

Caterpillar BRK1-UpCaterpillar CAL1-UpCaterpillar CMC1-UpCaterpillar CNB1-UpCaterpillar FDN1-Up

How to read your Caterpillar engine serial & model number →

Common problems

Engine Overcrank Warning — ENGINE FAILURE TO START SHUTDOWN is displayed on the EMCP 3
Cause: The engine does not start within the number of crank cycles that are programmed
Fix: Check for active diagnostic codes on the engine ECM and the EMCP 3 and correct them first; view the setpoints (Crank Duration, Crank Cycle Rest Interval, and Maximum Number of Crank Cycles) and compare against the default setpoints, reprogram the setpoints if not correct; for MUI engines inspect the 2301A Governor power source and wiring; for EUI engines check communications between EMCP 3 and Engine ECM
Data Link Circuit Fault 102463551
Cause: An open circuit or a short circuit in a Data Link (J1939 Accessory Data Link; J1939 Primary Data Link; Modbus RS-485 SCADA Data Link)
Fix: Inspect the EMCP 3 connector, the service tool connector, and all other connectors in the circuit for the data link; check for shorts in the Modbus RS-485 SCADA Data Link harness (resistance greater than 20,000 Ohms); check the resistance through the Modbus RS-485 SCADA Data Link harness (less than 10 Ohms); check for shorts in the J1939 Data Link harness; repair the wiring or replace the wiring
Utility Circuit Breaker Closed — UTILITY BREAKER CLOSED 4005 31
Fix: Digital Input Circuit Fault
Unexpected Engine Shutdown — UNEXPECTED ENGINE SHUTDOWN 4008 31
Fix: Unexpected Engine Shutdown
Starting Air Pressure Sensor Short Low — STARTING AIR PRES SENSOR SHORT LOW 82 4
Fix: Analog Input Circuit Fault
Starting Air Pressure Sensor Short High — STARTING AIR PRES SENSOR SHORT HIGH 82 3
Fix: Analog Input Circuit Fault
Service Maintenance Interval Warning — SERV MAINT INTERVAL WARNING 2648 31
Fix: Service Information Interval Warning
SCADA Data Link Fault — SCADA DATA LINK FAULT 625 11
Fix: Data Link Circuit Fault
Right Exhaust Temperature Sensor Short Low — RIGHT EXHAUST TEMP SENSOR SHORT LOW 2433 4
Fix: Analog Input Circuit Fault
Right Exhaust Temperature Sensor Short High — RIGHT EXHAUST TEMP SENSOR SHORT HIGH 2433 3
Fix: Analog Input Circuit Fault
Primary Data Link Fault — PRIMARY DATA LINK FAULT 639 11
Fix: Data Link Circuit Fault
Oil Filter Differential Pressure Sensor Short Low — OIL FILTER DIFF PRES SENSOR SHORT LOW 99 4
Fix: Analog Input Circuit Fault
Oil Filter Differential Pressure Sensor Short High — OIL FILTER DIFF PRES SENSOR SHORT HIGH 99 3
Fix: Analog Input Circuit Fault
Low Starting Air Pressure Warning — LOW STARTING AIR PRES WARNING 82 17
Fix: Digital Input Circuit Fault and Analog Input Circuit Fault
Low Starting Air Pressure Shutdown — LOW STARTING AIR PRES SHUTDOWN 82 1
Fix: Digital Input Circuit Fault and Analog Input Circuit Fault

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar EUI.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Engine speed sensor adjustment (turn counterclockwise from gear contact)	270	degrees	three-fourths turn
Gap	Engine speed sensor AC signal voltage at rated speed	2 or greater	ACV	engine running at rated speed
Resistance	Engine speed potentiometer resistance (MUI engines)	0 to 100	ohms	adjustable
Resistance	Engine speed sensor resistance between contact 66 and 67	100 to 350	ohms
Resistance	Engine speed sensor resistance between sensor contact 1 and 2	100 to 350	ohms
Resistance	J1939 Data Link resistance between data link + and -	approximately 60	ohms
Resistance	Modbus RS-485 SCADA Data Link harness resistance	less than 10	ohms
Resistance	Modbus RS-485 SCADA Data Link short check (to data link - and chassis ground)	greater than 20,000	ohms
Resistance	Wiring harness open circuit test	less than 5	ohms	normally closed circuit
Resistance	Wiring harness short circuit test	greater than 5000	ohms	between circuit and unrelated circuits
Torque	Speed sensor locknut	25 ± 5	N·m	(18 ± 4 lb ft)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
38-0	EXT TANK HIGH FUEL LEVEL S/D	External Tank High Fuel Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
38-1	EXT TANK LOW FUEL LEVEL S/D	External Tank Low Fuel Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
38-3	EXT TANK FUEL LEVEL SENSOR SHORT HIGH	External Tank Fuel Level Sensor Short High		Analog Input Circuit Fault
38-4	EXT TANK FUEL LEVEL SENSOR SHORT LOW	External Tank Fuel Level Sensor Short Low		Analog Input Circuit Fault
38-15	EXT TANK HIGH FUEL LVL WARNING	External Tank High Fuel Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
38-17	EXT TANK LOW FUEL LVL WARNING	External Tank Low Fuel Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
82-0	HIGH STARTING AIR PRES SHUTDOWN	High Starting Air Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
82-1	LOW STARTING AIR PRES SHUTDOWN	Low Starting Air Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
82-3	STARTING AIR PRES SENSOR SHORT HIGH	Starting Air Pressure Sensor Short High		Analog Input Circuit Fault
82-4	STARTING AIR PRES SENSOR SHORT LOW	Starting Air Pressure Sensor Short Low		Analog Input Circuit Fault
82-15	HIGH STARTING AIR PRES WARNING	High Starting Air Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
82-17	LOW STARTING AIR PRES WARNING	Low Starting Air Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
95-0	HIGH FUEL FLTR DIFF PRES SHUTDOWN	High Fuel Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
95-1	LOW FUEL FILTER DIFF PRES SHUTDOWN	Low Fuel Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
95-3	FUEL FLTER DIFF PRES SENSOR SHORT HIGH	Fuel Filter Differential Pressure Sensor Short High		Analog Input Circuit Fault
95-4	FUEL FLTR DIFF PRES SENSOR SHORT LOW	Fuel Filter Differential Pressure Sensor Short Low		Analog Input Circuit Fault
95-15	HIGH FUEL FLTR DIFF PRES WARNING	High Fuel Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
95-17	LOW FUEL FILTER DIFF PRES WARNING	Low Fuel Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
96-0	HIGH FUEL LEVEL SHUTDOWN	High Fuel Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
96-1	LOW FUEL LEVEL SHUTDOWN	Low Fuel Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
96-3	FUEL LEVEL SENSOR SHORT HIGH	Fuel Level Sensor Short High		Analog Input Circuit Fault
96-4	FUEL LEVEL SENSOR SHORT LOW	Fuel Level Sensor Short Low		Analog Input Circuit Fault
96-15	HIGH FUEL LEVEL WARNING	High Fuel Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
96-17	LOW FUEL LEVEL WARNING	Low Fuel Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
98-0	HIGH ENGINE OIL LVL SHUTDOWN	High Engine Oil Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
98-1	LOW ENGINE OIL LVL SHUTDOWN	Low Engine Oil Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
98-3	ENGINE OIL LEVEL SENSOR SHORT HIGH	Engine Oil Level Sensor Short High		Analog Input Circuit Fault
98-4	ENGINE OIL LEVEL SENSOR SHORT LOW	Engine Oil Level Sensor Short Low		Analog Input Circuit Fault
98-15	HIGH ENGINE OIL LVL WARNING	High Engine Oil Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
98-17	LOW ENGINE OIL LVL WARNING	Low Engine Oil Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
99-0	HIGH OIL FILTER DIFF PRES SHUTDOWN	High Oil Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
99-1	LOW OIL FILTER DIFF PRES SHUTDOWN	Low Oil Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
99-3	OIL FILTER DIFF PRES SENSOR SHORT HIGH	Oil Filter Differential Pressure Sensor Short High		Analog Input Circuit Fault
99-4	OIL FILTER DIFF PRES SENSOR SHORT LOW	Oil Filter Differential Pressure Sensor Short Low		Analog Input Circuit Fault
99-15	HIGH OIL FILTER DIFF PRES WARNING	High Oil Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
99-17	LOW OIL FILTER DIFF PRES WARNING	Low Oil Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
100-1	LOW ENGINE OIL PRESS SHUTDOWN	Low Engine Oil Pressure Shutdown	Shutdown	Data Link circuit Fault and Digital Input Circuit Fault
100-17	LOW ENGINE OIL PRESS WARNING	Low Engine Oil Pressure Warning	Warning	Data Link circuit Fault and Digital Input Circuit Fault
107-0	HIGH AIR FILTER DIFF PRES SHUTDOWN	High Air Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
107-1	LOW AIR FILTER DIFF PRES SHUTDOWN	Low Air Filter Differential Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
107-3	AIR FILTER DIFF PRES SENSOR SHORT HIGH	Air Filter Differential Pressure Sensor Short High		Analog Input Circuit Fault
107-4	AIR FILTER DIFF PRES SENSOR SHORT LOW	Air Filter Differential Pressure Sensor Short Low		Analog Input Circuit Fault
107-15	HIGH AIR FILTER DIFF PRES WARNING	High Air Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
107-17	LOW AIR FILTER DIFF PRES WARNING	Low Air Filter Differential Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
110-0	HIGH ENGINE COOLANT TEMP SHUTDOWN	High Engine Coolant Temperature Shutdown	Shutdown	Data Link Circuit Fault and Digital Input Circuit Fault
110-15	HIGH ENGINE COOLANT TEMP WARNING	High Engine Coolant Temperature Warning	Warning	Data Link Circuit Fault and Digital Input Circuit Fault
110-17	LOW COOLANT TEMP WARNING	Low Engine Coolant Temperature Warning	Warning	Data Link Circuit Fault and Digital Input Circuit Fault
111-0	HIGH ENG COOL LEVEL SHUTDOWN	High Engine Coolant Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
111-1	LOW ENG COOL LEVEL SHUTDOWN	Low Engine Coolant Level Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
111-3	ENGINE COOLANT LEVEL SENSOR SHORT HIGH	Engine Coolant Level Sensor Short High		Analog Input Circuit Fault
111-4	ENGINE COOLANT LEVEL SENSOR SHORT LOW	Engine Coolant Level Sensor Short Low		Analog Input Circuit Fault
111-15	HIGH ENG COOL LEVEL WARNING	High Engine Coolant Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
111-17	LOW ENG COOL LEVEL WARNING	Low Engine Coolant Level Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
137-0	HIGH FIRE EXTNG PRES SHUTDOWN	High Fire Extinguisher Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
137-1	LOW FIRE EXTNG PRES SHUTDOWN	Low Fire Extinguisher Pressure Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
137-3	FIRE EXTING PRES SENSOR SHORT HIGH	Fire Extinguisher Pressure Sensor Short High		Analog Input Circuit Fault
137-4	FIRE EXTNG PRES SENSOR SHORT LOW	Fire Extinguisher Pressure Sensor Short Low		Analog Input Circuit Fault
137-15	HIGH FIRE EXTNG PRES WARNING	High Fire Extinguisher Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
137-17	LOW FIRE EXTNG PRES WARNING	Low Fire Extinguisher Pressure Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
167-17	LOW BATTERY CHARGING SYS VOLT WARN	Low Battery Charging System Voltage Warning	Warning	Charging System
168-0	HIGH BATTERY VOLTAGE SHUTDOWN	High Battery Voltage Shutdown	Shutdown	Charging System
168-15	HIGH BATTERY VOLTAGE WARNING	High Battery Voltage Warning	Warning	Charging System
168-17	LOW BATTERY VOLTAGE WARNING	Low Battery Voltage Warning	Warning	Charging System
171-0	HIGH AMBIENT AIR TEMP SHUTDOWN	High Ambient Air Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
171-1	LOW AMBIENT AIR TEMP SHUTDOWN	Low Ambient Air Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
171-3	AMBIENT AIR TEMP SENSOR SHORT HIGH	Ambient Air Temperature Sensor Short High		Analog Input Circuit Fault
171-4	AMBIENT AIR TEMP SENSOR SHORT LOW	Ambient Air Temperature Sensor Short Low		Analog Input Circuit Fault
171-15	HIGH AMBIENT AIR TEMP WARNING	High Ambient Air Temperature Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
171-17	LOW AMBIENT AIR TEMP WARNING	Low Ambient Air Temperature Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
173-0	HIGH EXHAUST TEMP SHUTDOWN	High Exhaust Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
173-1	LOW EXHAUST TEMP SHUTDOWN	Low Exhaust Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
173-3	EXHAUST TEMPERATURE SENSOR SHORT HIGH	Exhaust Temperature Sensor Short High		Analog Input Circuit Fault
173-4	EXHAUST TEMPERATURE SENSOR SHORT LOW	Exhaust Temperature Sensor Short Low		Analog Input Circuit Fault
173-15	HIGH EXHAUST TEMP WARNING	High Exhaust Temperature Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
173-17	LOW EXHAUST TEMP WARNING	Low Exhaust Temperature Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault
175-0	HIGH ENGINE OIL TEMP SHUTDOWN	High Engine Oil Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
175-1	LOW ENGINE OIL TEMP SHUTDOWN	Low Engine Oil Temperature Shutdown	Shutdown	Digital Input Circuit Fault and Analog Input Circuit Fault
175-3	ENGINE OIL TEMP SENSOR SHORT HIGH	Engine Oil Temperature Sensor Short High		Analog Input Circuit Fault
175-4	ENGINE OIL TEMP SENSOR SHORT LOW	Engine Oil Temperature Sensor Short Low		Analog Input Circuit Fault
175-15	HIGH ENGINE OIL TEMP WARNING	High Engine Oil Temperature Warning	Warning	Digital Input Circuit Fault and Analog Input Circuit Fault

Showing the first 80 of 166 codes.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Speed Sensor (Engine) - Adjust adjustment

Remove the speed sensor from the flywheel housing. Remove all debris from the tip. Align a ring gear tooth in the center of the threaded sensor opening.
By hand, screw the speed sensor into the hole until the end contacts the gear tooth.
Turn the sensor counterclockwise through 270 degrees (three-fourths turn).
Tighten locknut to 25 ± 5 N·m (18 ± 4 lb ft). Do not allow sensor to turn.

Wiring Harness (Open Circuit) - Test diagnostic

Tools: Digital multimeter

Identify the connectors and wire numbers of the suspect circuits using the Electrical System Schematic.
Turn the disconnect switch to the OFF position.
Disconnect the components and the ECM from the wiring harness.
Place a jumper wire from the contact of the suspect wire to frame ground at one disconnected harness connection.
At the other connector, measure resistance from the contact of the suspect wire to frame ground.

Wiring Harness (Short Circuit) - Test diagnostic

Tools: Digital multimeter

Identify the connectors and wire numbers of the suspect circuits using the Electrical System Schematic.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the component and the ECM from the wiring harness.
Place one multimeter probe on the contact of the suspect wire at the ECM harness connector.
Use the other probe to check resistance across all other contacts in the ECM connectors and frame ground.

Electrical Connector - Inspect maintenance

Tools: Cotton swab or soft brush, Denatured alcohol

Check the connection of the connectors: locking rings locked, locking clips on Sure Seal connectors, center tight, pins and sockets aligned.
Check the wires at the connector: straight entry, properly crimped, contacts locked into connector.
Check each wire for nicks or abrasion in the insulation.
Check for moisture at the connector (damaged or lost seals, loose wire hole plugs).
Check for dirty or corroded contacts. Clean with cotton swab or soft brush and denatured alcohol only.
Check each pin and socket for a snug fit using a new pin and socket.

Real Time Clock Programming operation

From the MAIN MENU highlight CONFIGURE and press Enter; SECURITY is highlighted.
Scroll down to highlight TIME/DATE and press Enter; SET TIME/DATE is displayed.
Select the time, then use Scroll Right/Left to select a digit and Scroll Up/Down to change it.
Press Enter to save the time; press Escape once to return to SET TIME/DATE.
Highlight and select the date; program the 8-digit date with year highlighted.
Press Enter to save the date; press Escape three times to return to MAIN MENU.

Voltage and Frequency Adjustment operation

From the MAIN MENU, highlight the CONTROL menu and press Enter. ADJUST SPEED and ADJUST VOLTAGE are displayed.
Press the Scroll Up key to increase voltage or the Scroll Down key to decrease voltage.
Press the Scroll Left key to decrease engine speed or the Scroll Right key to increase engine speed.

Electronic Control Module (Generator Set) - Flash Program repair

Tools: 171-4400 Communication Adapter II, Caterpillar Electronic Technician (ET) with WinFlash

Connect the Data Link Cable between the Communication Adapter and the Electronic Technician.
Connect the Data Link Cable between the Communication Adapter and the Service Connector of the genset.
Turn the disconnect switch to the ON position.
Use WinFlash in order to load the software.

Electronic Control Module (Generator Set) - Replace repair

Tools: 4 mm hex wrench

Note hour meter, all engine setpoints, and programmed spare inputs/outputs from old ECM.
Shut down the engine. Remove the positive lead wire from the battery.
Remove the harness connector from the ECM. A 4 mm hex wrench is required.
Remove the six nuts that fasten the ECM to the front panel. Remove the ECM.
Place new ECM in the front panel, install and tighten the six nuts.
Reconnect the harness connector and the positive battery lead.
Reprogram setpoints, spare inputs/outputs, hour meter, voltmeter/ammeter programming and AC offset adjustment.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

Which generators use the Caterpillar EUI engine?

The Caterpillar EUI powers 5 generator set(s), including Caterpillar BRK1-Up, Caterpillar CAL1-Up, Caterpillar CMC1-Up, Caterpillar CNB1-Up, Caterpillar FDN1-Up.

What is a common problem with the Caterpillar EUI engine?

A commonly reported issue on generators using the Caterpillar EUI is: Engine Overcrank Warning — ENGINE FAILURE TO START SHUTDOWN is displayed on the EMCP 3. Cause: The engine does not start within the number of crank cycles that are programmed. Fix: Check for active diagnostic codes on the engine ECM and the EMCP 3 and correct them first; view the setpoints (Crank Duration, Crank Cycle Rest Interval, and Maximum Number of Crank Cycles) and compare against the default setpoints, reprogram the setpoints if not correct; for MUI engines inspect the 2301A Governor power source and wiring; for EUI engines check communications between EMCP 3 and Engine ECM.