GROUP
HVAC
DATE

Technical Service Bulletin
SUBJECT:

APRIL, 2019

NUMBER
19-HA-001H
MODEL(S)
Multiple HEV, PHEV,
and EV Models

ELECTRIC COMPRESSOR INVERTER
DIAGNOSTIC AND REPLACEMENT GUIDELINES

Description: This bulletin provides additional service diagnostic information and repair procedures
related to electric A/C compressors equipped in hybrid electric vehicles, plug-in hybrid electric
vehicles, and electric vehicles.
Refer to the applicable Shop Manual HVAC section of the vehicle, and then follow the procedures
outlined in this bulletin whenever a vehicle with the following symptom(s) are being diagnosed:
 A/C does not get cold enough or A/C does not operate at all.
 A/C compressor operates with very high abnormal noise.
 Related Diagnostic Trouble Code (DTC) is present.
!

WARNING

Be sure to read and follow the sections listed below from the applicable Shop Manual before
doing any work related with the high voltage system:
 General Safety Information and Caution
 High Voltage Shut-Off Procedures
Failure to follow the safety instructions may result in serious electrical injuries.
Component Overview:
The electric A/C compressor is comprised of 3 segments with each part tasked to a specific function.


Inverter Part – Converts direct current to 3phase alternating current to control the
compressor speed for supporting the required
cooling or heating (if equipped with a heat pump
system) demand.
o Main Parts: PC Board, High voltage
capacitor, Power switch



Motor Part – The brushless DC motor converts
the electric energy into mechanical motion.
o Main Parts: Stator, Rotor, Insulator,
Magnet



Compressor Part – An orbital scroll rotated by
the motor compresses the refrigerant against the
fixed scroll.
o Main Parts: Fixed/Orbital Scroll, Antirotating mechanism, Shaft/Bushing

Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

SUBJECT:

ELECTRIC COMPRESSOR INVERTER DIAGNOSTIC AND REPLACEMENT GUIDELINES

NOTICE
If there’s an issue with other parts of the high voltage system (such as the battery pack,
BMS, power line, fuse, etc.), then it may affect the proper operation of the compressor.
Troubleshooting Flow Diagram:
Follow the information shown below to determine the proper diagnosis and repair procedure.

Service Procedure - Section A:
1. Remove the suction pipe fitting from compressor to gain access to the suction port.
2. Inspect the copper wire and white thread inside the suction port for burnt colored contamination.
Inspection Results – Next Steps
Contamination:
Replace
Compressor

No Contamination:
Go to Section B if
other issues exist.

TSB #: 19-HA-001H

Page 2 of 5

SUBJECT: ELECTRIC COMPRESSOR INVERTER DIAGNOSTIC AND REPLACEMENT GUIDELINES

Service Procedure - Section B:
1. If there any BMS related codes unrelated to the A/C system, resolve the BMS related issues first
and then retest the A/C system function again to determine if further diagnosis is necessary.
2. Inspect the 30A High Voltage DC Protection Fuse if any of the following symptoms are present
and then retest the A/C system.



Compressor will not operate (A/C is not cold).
DTC set in DATC system (B1801 or B1695).

NOTICE
 30A High Voltage DC Fuse is located in the HPCU.
 Shut off High Voltage before inspecting the DC Fuse.

3. Inspect and diagnose the A/C system according to the DTC issues listed below.

DTC Issue List

Related DTC Category

1

CAN Communication Error

B1695, B169588

2

Operation Status Error

B1696, B169688, B1807

3

Interlock Circuit Open

B2470, B247013

4

Low Voltage Warning

B1821, B182188, B1801

5

High Voltage Warning

B1822, B182288, B1802



Refer to the following page for the inverter connector and harness pin resistance inspection
procedures.

TSB #: 19-HA-001H

Page 3 of 5

SUBJECT:

ELECTRIC COMPRESSOR INVERTER DIAGNOSTIC AND REPLACEMENT GUIDELINES

4. Check the resistance at the electric A/C compressor High and Low Voltage connectors.
 Operation Status Error can be the result of internal inverter damage.
o Check the High Voltage Connector resistance.
o Replace the inverter if resistance is out of spec and then retest the A/C system.
High Voltage Connector - Resistance Value Checking
Inspect High Voltage input and ground
(Connector Varies By Model)
resistance between terminals ① and ②.
 OK  Over 100Ω (Open)
 NG  Below 100Ω



① HV High Voltage IG
② HV High Voltage GRN
③ External Interlock (-)
④ External Interlock (+)

CAN Communication Error can be the result of poor contact at the Low Voltage Connector.
o Inspect the connector for (bent pin, poor contact, damage, etc.) and then inspect the
Low Voltage Connector resistance.
o Retest A/C operation after checking or replace the inverter if resistance is out of spec.

NOTICE
Refer to the correct CAN High / CAN Low resistance specifications after confirming the
Inverter Type by part number and VIN production date listed in the Parts Information table.


Interlock Circuit Open can be the result of poor contact at the Low Voltage Connector.
o Inspect the connector proper connection (complete insertion) and then inspect the Low
Voltage Connector interlock resistance after connecting the High Voltage Connector.
o Retest A/C operation after checking or replace the inverter if resistance is out of spec.

Low Voltage Connector - Resistance Value Checking
Inspect CAN High/Low resistance between terminals
② and ⑤.
 OK  Approx. 120 Ω
 NG  Short (≒0 Ω)
 Refer to Parts Information to verify Inverter Type.
Inspect CAN Low ground resistance between
terminals ① (DVOM + probe) and ② (DVOM - probe).
Inspect CAN High ground resistance between
terminals ① (DVOM + probe) and ⑤ (DVOM - probe).
 OK 13~14 KΩ (Conventional Type)
 OK 200~600 KΩ (High Performance DSP Type)
 NG  Short (≒0 Ω) (Both Inverter Types)
Inspect resistance at terminals ③ and ⑥ for interlock
(-/+).
 OK  Below 1.0Ω
 NG  ∞MΩ
NOTE: Connect the high voltage connector in order
to measure the interlock resistance.
TSB #: 19-HA-001H

① GND 12V
② CAN Low
③ Interlock (-)
④ IG 12V
⑤ CAN High
⑥ Interlock (+)

Page 4 of 5

SUBJECT: ELECTRIC COMPRESSOR INVERTER DIAGNOSTIC AND REPLACEMENT GUIDELINES

5. Once it is determined that the Inverter of the Electric A/C Compressor needs replacement, refer to
the applicable Shop Manual for the specific Removal and Installation procedure.
 Shop Manual > Heating, Ventilation and Air Conditioning > Air Conditioning System > Electric
A/C Compressor > Repair procedures > Inverter
NOTE: If the inverter removal and installation service information is not available for a specific
model, refer to the service information for a similar model until the information becomes available.

Parts Information:



Part numbers may be subject to change. Newly created part numbers may be available.
Refer to the latest Parts Catalog and filter by VIN for the applicable part numbers.
Model Year / Model
Compressor
Inverter Kit
Inverter Type
19MY- (FE) NEXO FC
97701-M5000 977S5-M5000
High Performance DSP
15-17MY (LMFC) Tucson FC
97701-4W000 97728-4W000
Conventional
19MY- (OS) KONA EV
97701-K4000 97728-K4000
High Performance DSP
18MY- (AE) IONIQ PHEV
97701-G2800 97728-G2800
Conventional
17MY- (AE) IONIQ HEV
97701-G2000 97728-G2000
Conventional
17MY- (AE) IONIQ EV
97701-G7000 97728-G7000
Conventional
97701-E6100
16-19MY (LFE) Sonata PHEV
97728-E6100
Conventional
97701-E6110
Conventional (SOP-4/18/2018)
97701-E6000
16-19MY (LFE) Sonata HEV
97728-E6000 High Performance DSP (4/19/2018-)
97701-E6010
High Performance DSP (3/15/2019-)
11-15MY (YFE) Sonata HEV
97701-4U000 97728-E7000
Conventional
NOTES:
 Replacement electric compressors include the inverter and are pre-filled with compressor oil.
 Replace only if the motor or compressor portion is damaged/contaminated.
 Replacement inverters include the service kit containing the bolt(s), gasket, and thermal paste.
 CAN High / CAN Low resistance specifications can differ depending on Inverter Type
which can be determined by part number and VIN production date.
 Replace the inverter whenever the pin testing results show an out of spec condition.

Warranty Information:
Model
OP Code Operation
Op Time
Refer to Parts
Information
Refer to WEB
Compressor
97729R00
table for
LTS for the
Inverter
appropriate
current LTS time
model
NOTE: Normal warranty procedures apply.

TSB #: 19-HA-001H

Causal Part

Nature

Cause

Refer to Parts
Information table
above for
applicable P/N

I11

ZZ3

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