GROUP

NUMBER

CAMPAIGN
DATE
JUNE, 2023
0B

Technical Service Bulletin
SUBJECT:
1B

23-01-051H-1
MODEL(S)
TUCSON PLUG-IN
(NX4 PHEV) &
SANTA FE PLUG-IN
(TM PHEV)

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT
CHANGE (SERVICE CAMPAIGN T9F)
2B

This TSB supersedes 23-01-051H to include updated information on disconnecting the 12V
circuit on page 6, step 3.

 IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail
delivery and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WEBDCS to identify open campaigns.
DESCRIPTION: This bulletin provides information related to the cleaning of the cooling system and
coolant change to address the following problem:
 “Refill Inverter Coolant” warning light displayed on the cluster
 No DTC’s present
 Normal level of coolant in Inverter Reservoir Tank
 Measured EWP Speed > 2,800 RPM
The cause of the warning light is due to increased EWP Speed due to poor flow of coolant inside the
cooling circuit. The coolant in the system will be discharged and any foreign substances in the circuit
will be flushed out with new coolant added in the end.
STUI
As outlined in the Digital Documentation Policy, all claims require VIN and Mileage validation
through VCI connection or photo capture. Additionally, please ensure the repair Part photo
requirement is completed according to the steps in the TSB. All claims submitted that have
incomplete, illegible, or missing documentation are subject to debit.

APPLICABLE VEHICLES (Certain):
 2022MY Tucson Plug-in Hybrid (NX4 PHEV) equipped with 1.6L Gamma II turbocharged
engines produced from 06/30/2021 – 11/01/2021.
 2022MY Santa Fe Plug-in Hybrid (TM PHEV) equipped with 1.6L Gamma II turbocharged
engines produced from 05/13/2021 – 09/30/2021.

Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair

SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

Information

i




To ensure proper understanding of the service procedure and equipment
connections, it is recommended to view or print this bulletin in color.
When working on the vehicle, ensure to disconnect the high voltage system and
wear protective eye safety goggles to avoid injury from coolant leaks under
pressure.
To securely connect the equipment hoses, use existing coolant hose clamps at the
identified locations on the vehicle as the equipment flushes coolant under pressure.

PARTS INFORMATION:
Part Name

Part Number

Quantity

Coolant (BSC-2)

00232-19113

2 gal.

Remarks
Supersedes 00232-19111

SST INFORMATION:
Tool Name

Figure

Coolant Flushing
Equipment Set

Part Number

Quantity

Remarks

KQ253-CV158QQH

1

Each dealer will be shipped
one free of charge

WARRANTY INFORMATION:
Model

Op Code

Operation

Op Time

Causal Part

Tucson Plug-in
(NX4 PHEV)

20D141R1

COOLING SYSTEM
CIRCUIT DEBRIS
DISCHARGE AND
COOLANT
REPLACEMENT

1.1 M/H

00232-19113

Santa Fe Plug-in
(TM PHEV)

20D141R2

Nature Cause
Code Code

E83

ZZ5

NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part that is not covered by this campaign is found in need of replacement
while performing the Service Campaign and the affected part is still under warranty, submit
a separate claim using the same repair order. If the affected part is out of warranty, submit
a Prior Approval request for goodwill consideration prior to the repair.
NOTE 3: Op times include VIN, Mileage and Part (if applicable) validation. All claims
submitted that have incomplete, illegible, or missing documentation are subject to
debit.

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

COOLANT FLUSH AND FILTER EQUIPMENT OPERATING INSTRUCTIONS:
1. Air Draining (Coolant discharge)
a. When discharging the remaining coolant using air, turn off the coolant pump
and close the inlet valve. (If the inlet valve is opened, the air may flow back
and the remaining coolant may not be recovered.)
b. Equipment setting condition:
i. Air ‘ON’, Pump ‘OFF’, Inlet valve ‘OFF’

c. The air pressure can be adjusted up to 3 bar to achieve desired draining
performance.
2. Coolant Cleaning (Flushing and filtering of the vehicle’s coolant circuit)
a. Equipment setting condition:
i. Pressure 2 bar, Air ‘ON’, Pump ‘ON’, Inlet valve ‘ON’

b.

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

CAUTION

!

The coolant circulation container must always have 8L (about half of the reservoir bottle) of either
tap water, distilled water or coolant (blue BSC-2) that was discharged from the previous vehicle.
Never use salty or light water in the coolant circulation container.



For cleaning equipment, make sure to turn on the water pump first and then turn on the air.
After turning on the air, visually check whether the air comes out from the end of the inlet of
the equipment. When air does not come out, operate the air pressure valve to increase the
pressure a little to check that air comes out and set it to 2 bar.

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

NOTICE
After one cleaning operation is completed, clean the filter & filter case of the equipment with an
air gun to remove foreign substances.
 Ensure to remove as much of the foreign substances as possible.
 A poorly cleaned filter can result in decreased flow rate and degrade the cleaning effect
of the cleaning machine.



Sludge can get stuck to the inner wall of the filter gaps, be sure to clean the filter evenly.

! WARNING



When working on the high voltage system, make sure that you are familiar and comply with
the "Safety Precautions, Cautions and Warnings." If you do not comply with the instructions,
death or serious injury due to electric shock or leakage may occur.
When working on the high voltage system, make sure to cut off the high voltage first
according to the "High Voltage Cut-off Procedure." If you do not comply with the
instructions, death or serious injury due to electric shock or leakage may occur.

CAUTION

!


Be sure to wear sufficient eye protection (safety goggles) when connecting or disconnecting
hoses to the vehicle and when operating the coolant cleaning equipment until you have
verified coolant discharge and cleaning is operating properly. An accidental discharge may
occur and fluid may enter your eyes if you do not follow this precaution.

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

VEHICLE SERVICE PROCEDURE – DEBRIS DISCHARGE AND COOLANT CHANGE

1. Check for blue coolant inside the inverter reservoir
tank.
2. Using the GDS under “Data Analysis”, monitor the
initial RPM of the EWP when starting vehicle to
confirm Refill Inverter Coolant warning.
- Spec is 2,000 – 2,800 RPM
- “Refill Inverter Coolant" displayed above 2,800
RPM.

A

3. Turn off the vehicle and remove the service
interlock connector (A). Disconnect the negative
battery cable under the rear deck in the hatch
area.

4. Remove the reservoir tank cap (B) then remove
the coolant from inside the tank using the Siphon
Pump Hose.
- Use a bucket to catch the coolant that comes out
from the discharge side of the Siphon Pump Hose as
seen in the photo.

B

Siphon Pump Hose

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

5. Ensure that the supplied 90Deg angled hose
fittings are installed on the hose ends.

6. Disconnect the two hoses from the reservoir tank
and connect them to the cleaning equipment as
follows:
- Circulation inlet hose Blue to the hose located
on the left side of the reservoir tank.
- Circulation outlet hose Red to the hose located
on the upper right side of the reservoir tank.
- Circulate coolant and air to perform a 3-minute
cleaning.
7. While the cleaning equipment is in operation,
remove the reservoir tank to clean the residual
coolant and debris inside.
- Use tap or distilled water to flush out thoroughly
ensuring there is no blue coolant residual visible.
- Once thoroughly flushed out, use an air tool to
dry out the reservoir.

B
Circulation
outlet (hose)

Outlet

Circulation
inlet (hose)

Inlet

Coolant
circulation
container

8. After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through the
system for 30 seconds. Turn off the air to the
cleaning equipment.

Coolant pump
and air
pressurizer

Foreign material

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

9. Reverse the hose connections from step 6.
- Circulation inlet hose Blue to the hose located
on the upper right side of the reservoir tank.
- Circulation outlet hose Red to the hose located
on the left side of the reservoir tank.
- Circulate coolant and air to perform a 3-minute
cleaning.
10. Repeat operation 7.
- After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through
the system for 30 seconds. Turn off the air to the
cleaning equipment.
11. Repeat operation 6.
- Circulation inlet hose Blue to the hose located
on the left side of the reservoir tank.
- Circulation outlet hose Red to the hose located
on the upper right side of the reservoir tank.
- Circulate coolant and air to perform a 3-minute
cleaning.

B
0

Circulation inlet
(hose)

Outlet

12. After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through
the system for 1 minute. Turn off the air to the
cleaning equipment.

Circulation
outlet (hose)

Inlet

Coolant
circulation
container
Coolant pump
and air
pressurizer

Foreign material

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

13. Remove the air separator.

14. Disconnect the two circulation hoses from the
reservoir tank hoses and connect them to the air
separator hoses as follows:
- Circulation inlet hose Blue to the air separator
inlet hose (left when looking from the top)
- Circulation outlet hose Red to the air separator
outlet hose (right when looking from the top).
- Circulate coolant and air to perform a 5-minute
cleaning.
15. After 5 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through the
system for 1 minute. Turn off the air to the cleaning
equipment.

E

0
Circulation
inlet (quick
connector)

16. Remove the circulation equipment and reinstall
the air separator, inverter reservoir tank and all
hose connections.

Circulation
outlet (quick
connector)
Direction of
cleaning/air
blowing

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

17. Confirm that all coolant hoses are properly
installed and inject the improved low-conductivity
coolant (BSC-2) into vehicle.
- Reconnect the Service Interlock Connector (A)
- Perform air bleeding through ‘S/W Management
→ Electric Water Pump Control (about 3 minutes)’
in the GDS-M.
- Additionally perform the air bleeding through
‘Actuation Test → Select ‘BMS’ → EWP Max RPM
Operation (about 10 minutes)’.

Outlet

Inlet

Coolant
circulation
container
Coolant pump
and air
pressurizer

NOTE

Foreign material

Coolant injection amount: 5.5 ~ 6.5ℓ
18. Turn the vehicle on into “Ready” mode and
confirm that the phrase “Refill Inverter Coolant” is not
shown on the cluster.
- If the message is shown, repeat the flush
procedure starting from Step 1.
- If the message is not shown, proceed to the next
step.

TSB #: 23-01-051H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9F)

19. Clean the filter & filter case of the equipment with
the air gun to remove foreign substances.
 Ensure to remove as much of the foreign
substances as possible.
 A poorly cleaned filter can result in decreased
flow rate and degrade the cleaning effect of the
cleaning machine.
 Sludge can get stuck to the inner wall of the
filter gaps, be sure to clean the filter evenly.

20.

STUI
Using STUI, photograph the
reservoir showing Blue BSC-2
coolant along with the last 6 digits
of the VIN and the date of the
repair on a piece of paper.
Upload the photo to STUI.

21. End of Service Procedure.

TSB #: 23-01-051H-1

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