NUMBER

GROUP
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Technical Service Bulletin

HYBRID
CONTROL

MODEL

DATE
JULY 2014

SUBJECT:

14-HC-001

SONAT A (YF HEV)

HYBRID ELECTRIC WATER PUMP DTC POC73, POA93 & Ul 116

Description: This bulletin provides diagnostic information and related service procedure for the
Sonata Hybrid electric water pump (EWP) with the following symptoms and/or OTC :
Warning light:
•
•
•
•
•

Check Engine light on
No "EV Ready" mode or "Ready" light blinks on and off
Charging warning light on , hybrid battery low
"Wrench " symbol (Se rvice Indicator symbol) blinks on and off
Warning in the instrument cluster display: "Hybrid System Warning! Safely stop and Do Not
Drive" and/or alarm sound

Drivability Symptoms :
•
•
•

Vehicle will not start or move in EV mode
Poor acceleration from a stop in EV mode
Veh icle jerks when decelerating to a stop .

OTC List:
OTC

Description

Inspect

POC73

Motor Electronics Coolant Pump 'A' Control

Electric Water Pump

POA93

Inverter 'A' Cooling System Performance

Electric Water Pump

U1116

Lost Communication with Motor Electronics

CAN Line

Applicable Vehicles:

j

2011- Sonata Hybrid (YF HEV)

Parts Information:
Model

Part

Section

PNC

Part Number

2011- Sonata
HEV

Electric water pump

25-251A

36900

36910-300**
(See Parts Catalog)

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

SUBJECT:

HYBRID ELECTRIC WATER PUMP DTC POC73, POA93 & Ul 116

Warranty Information
Model
2011Sonata
Hybrid
(YF HEV)

Op Code

Operation

Op Time

3691 OR1 H

Electric water
pump (EWP)

0.6

GOS operation

0.3

3691 ORQO

Causal P/N

Nature
Code

Cause
Code

36910-300**
(See Parts Catalog)

N09

C15

Service Procedure:
1.

Depress the brake pedal and press the Start/Stop button to select "EV Ready".
Attach a GOS , and select VIN, MCU menu and OTC . Record any OTC . Delete the OTC .

2.

Select Current Data and the parameters shown below.
Drive the vehicle until the engine coolant is fully warm and record the data or ask an assistant
to monitor the GDS.
Accelerate the vehicle to about 30 mph and brake moderately to a stop .
If the results are not as shown on the table below, the electric water pump may not be
functioning correctly.
• If not as shown , go to Step 3 and replace the EWP.
• If as shown , delete the OTC and drive the vehicle for two key-on/key-off drive cycles . If the
DTC and/or condition occur again , go to Step 3 and replace the EWP .
GOS Parameter
Enable Fla!=! for Electric Water Pump (EWP) Operation
Electric Water Pump (EWP) Operation Status
MCU Warning Flag
Electric Water Pump (EWP) Speed
MCU Temperature
MCU (GCU) Temperature
Generator HSG Temperature

3.

Result
ON
ON
OFF
2000-3300 rpm
Below 194°F (91 °C)
Below 199°F (93 °C)
Below 320°F (160°C)

Open the rear trunk and open the cove r to the
safety plug.
Put on insulation gloves and pull up on the
black tab and pull out the safety plug .

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WARNING

Failure to perform this procedure may
result in accidental injury or death.

TSB # : 14-HC-001

Page 2 of 3

SUBJECT:
4.

HYBRID ELECTRIC WATER PUMP OTC POC73, POA 93 & U1116

Without depressing the brake pedal , push the Start-Stop button 2 times to power the cluster.
Attach a GOS and select BMS menu , Current Data and Inverter Capacitor Voltage . Confirm
the Inverter Capacitor Voltage is less than 30V.
• If less than 30V, the system voltage is safe for the technician. Turn off the ignition and
disconnect the negative battery cable in the trunk . Go to Step 5.
• If more than 30V, wait until the voltage is within specification before performing any
repairs .

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5.

Replace the electric water pump (EWP) .
Refer to the procedure in the Sonata Hybrid
Shop Manual , Hybrid Motor System , Hybrid
Motor Cooling System , Electric Water Pump
(EWP) , Repair Procedures.

6.

Reassemble all parts in the reverse order of disassembly.

7.

Fill the radiator with coolant and check for leaks.

110 .

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Use a GOS to bleed air from the hybrid motor cooling system. Refer to the procedure in the
Sonata Hybrid Shop Manual , Hybrid Motor System , Hybrid Motor Cooling System and Coolant.
8.

Attach a GOS and delete any OTC .

9.

Clear the OTC in the Bluelink system according to instructions in TSB 12-BE-005-2 .

10.

Drive the vehicle to confirm proper operation of the vehicle and cooling system .

SB #: 14-HC-001

Page 3 of 3