GROUP
ELE

MODEL
2018-2019MY
Niro (DE EV/PHEV)

NUMBER
186 (Rev 1, 10/14/2019)

DATE
September 2019

TECHNICAL SERVICE BULLETIN
SUBJECT:

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

 NOTICE
This bulletin has been revised to include additional information. New/revised
sections of this bulletin are indicated by a black bar in the margin area.
This bulletin provides the procedure to inspect and repair the Electric Water Pump(s) (EWP) on
some 2018-2019MY Niro (DE) HEV, PHEV, and EV vehicles produced between November 24,
2018 through January 30, 2019, which may exhibit a MIL ON (DTC U1116 and/or U1118) due
to a coolant leak from the EWP Can Case. Follow the procedure in this bulletin to inspect and
repair the EWP. Before conducting the procedure, verify that the vehicle is included in the list of
affected VINs.

 NOTICE
A Service Action is a repair program without customer notification that is performed
during the warranty period. Any dealer requesting to perform this repair outside the
warranty period will require DPSM approval.
Repair status for a VIN is provided on WebDCS (Service → Warranty Coverage →
Warranty Coverage Inquiry → Campaign Information). Not completed Recall / Service
Action reports are available on WebDCS (Consumer Affairs → Not Completed Recall
→ Recall VIN → Select Report), which includes a list of affected vehicles.
This issue number is SA394.
File Under:
Circulate To:

X General Manager


X Service Advisors


X Technicians


X Service Manager


X Parts Manager


X Body Shop Manager 
X Fleet Repair


Page 2 of 9

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

SUBJECT:

EWP Repair Flowchart:

DE EV

DE HEV/PHEV
Vehicle In - MIL ON?
(DTC U1116)

YES

NO

Replace motor
EWP assembly
and connector.

Replace the
EWP Can Case kit(s)
only.

DTC Inspection
Delete Codes

Model
(DE)
(HEV/PHEV)

(DE)
(EV)

Vehicle In - MIL ON?
(DTC U1116 and/or U1118)

NO DTCs

DTC U1116 only.
Replace traction motor
EWP assembly and
connector. Replace
battery EWP Can Case
kit only.

Both DTCs stored.
Replace both
EWP assemblies
and connectors.

Air Bleeding

DTC U1118 only.
Replace battery EWP
assembly and connector.
Replace traction motor
EWP Can Case kit only.

Vehicle Out

MIL ON

Repair Procedure

DTC
U1116

Replace the hybrid motor
EWP assembly and EWP connector.

NO DTCs

Replace the hybrid motor EWP Can Case kit only.

DTC U1116
and U1118

Replace the both the battery and traction motor
EWP assemblies and EWP connectors.

DTC U1116

Replace the traction motor EWP assembly and EWP
connector. Replace the battery EWP Can Case kit.

DTC U1118

Replace the battery EWP assembly and EWP
connector. Replace the traction motor EWP Can Case kit.

NO DTCs

Replace the traction motor and battery EWP
Can Case kits only.

 NOTICE
This bulletin does not apply to the combustion engine electric water pump (EWP)
found on HEV/PHEV. It only applies to the hybrid motor EWP for HEV/PHEV models.

TSB: SA394 (Rev 1) Niro (DE HEV/PHEV/EV) September 2019

Page 3 of 9
SUBJECT:

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

EWP Inspection and Replacement Procedure:
1. (DE HEV/PHEV) Remove the hybrid motor
EWP assembly by referring to “Hybrid Motor
System → Hybrid Motor Cooling System →
Electric Water Pump (EWP) → Repair
procedures” chapter in the applicable Shop
Manual on KGIS.

Hybrid Motor
EWP

(HEV/PHEV)

(DE EV) Remove the battery motor EWP
assembly by referring to “Battery Control
System → High Voltage Battery Cooling
System → Motor Electric Water Pump
(EWP) → Repair procedures” chapter in the
applicable Shop Manual on KGIS.

Battery Motor
EWP

(DE EV) Remove the traction motor EWP
assembly by referring to “Traction Motor
System → Motor Cooling System → Motor
Electric Water Pump (EWP) → Repair
procedures” chapter in the applicable Shop
Manual on KGIS.

2.

Traction Motor
EWP

(EV)

If replacing the EWP Can Case kit,
proceed to page 3.
If replacing the EWP connector, proceed
to page 5.

EWP Can Case Replacement Procedure:
1. Using a 3mm hex tool, remove the five
(5) EWP cover bolts (A) from the EWP
assembly (B).
Torque specification for bolts (A):
3.6 lb.ft. (4.9 N.m, 0.5 kgf.m)

B

A

TSB: SA394 (Rev 1) Niro (DE HEV/PHEV/EV) September 2019

Page 4 of 9
SUBJECT:

2.

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

Detach the EWP cover (C) from the EWP
assembly (B).

C

B
3.

Remove the EWP Can Case (D) by
pulling apart from the EWP Assembly
(B).

D

B

4.

Remove the stator o-ring and replace
with the new supplied o-ring (E) from the
Can Case kit.

 NOTICE
The new stator o-ring from the
Can Case kit will have a white
marking.

TSB: SA394 (Rev 1) Niro (DE HEV/PHEV/EV) September 2019

E

Page 5 of 9
SUBJECT:

5.

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

Insert the new supplied Can Case (F)
from the Can Case kit into the EWP
assembly.

F

 NOTICE
Ensure to align the pin from the
Can Case to the EWP assembly
housing.

B
6.

Reassemble the EWP cover and torque
the five (5) retaining cover bolts from
step 1 to specification.

C

Torque specification for bolts:
3.6 lb.ft. (4.9 N.m, 0.5 kgf.m)

7.

If only replacing the EWP Can Case and
o-rings, replace all removed parts in the
reverse order of removal and follow the
recommended procedures outlined on
the “EWP Repair Flowchart” on page 2.
If also replacing the EWP connector,
proceed to the EWP Wiring Connector
Repair Procedure outlined on page 5
before re-installing the EWP assembly.

TSB: SA394 (Rev 1) Niro (DE HEV/PHEV/EV) September 2019

Page 6 of 9
SUBJECT:

SERVICE ACTION: ELECTRIC WATER PUMP
INSPECTION AND REPAIR (SA394)

EWP Wiring Connector Repair Procedure:
1.

Locate the EWP wiring harness and
connector (A). Niro (DE PHEV) is shown.

A