BULLETIN NOTES
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red.
Previous SA:

Date(s) Issued:

SA-017/23

09/14/23, 08/28/23, 07/24/23, 06/09/23, 05/24/23, 05/15/23 and 03/27/23

APPLICABLE MODEL(S)/VINS
2024 CX-90
DESCRIPTION
The CX-90 has new and revised features that are different from previous models and may be difficult to understand. This
Service Alert provides valuable information to support potential dealer and customer concerns.
Index

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PDI fuse
Key Transmitter and Auxiliary Key
Immobilizer (Code Word)
Theft-Deterrent System
High Voltage
Mazda M Hybrid Boost
Plug-In Hybrid Electric Vehicle (PHEV)
High Voltage Battery Service Cautions
High Voltage Battery Maintenance
PHEV 355V High Voltage Shutdown Before Service
M Hybrid Boost 48V High Voltage Shutdown Before Service
High Voltage Battery Replacement
Back Up Sub Battery for e-SKYACTIV PHEV
PHEV Refueling Procedure
PHEV Instrument Cluster Battery Range
PHEV interfere with flat lift
PHEV 355V and M Hybrid Boost 45V Electric Fan Service Caution
Engine Coolant Drain Location
PHEV 355V HVAC Compressor Oil
• Engine Oil Level Measurement (Infotainment Center Display)
• New FR-8EAT(Front Engine Rear Drive-8 Electrical Automatic Transmission)
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Newly developed Transfer Case for All-Wheel Drive
i-stop
PHEV Q85 type Battery Charging
i-ACTIVSENSE
i-ACTIVSENSE Indicators
Smart Brake Support (SBS)
Forward detection function
Turn-Across Traffic
Front Crossing
Intersection accident avoidance assist function
Rearward detection function
Rear Crossing
Secondary Collision Reduction
Mazda Radar Cruise Control with Stop & Go Function System (MRCC)
Speed Limit Assist
Cruising & Traffic Support (CTS)
Distance & Speed Alert (DSA)
Lane-Keep Assist System
Lane Departure Warning System (LDWS)
Emergency Lane Keeping (ELK)
Road Keep Assist
Blind Spot Assist
Head-on traffic avoidance assist
High Beam Control System (HBC)
Blind Spot Monitoring (BSM) System
Vehicle Exit Warning
Front Cross Traffic Alert (FCTA) System
Rear Cross Traffic Alert (RCTA) System
Driver Attention Alert (DAA) System
Driver Monitoring (DM)
Traffic Sign Recognition System (TSR)
360° View Monitor System
Driver Personalization System
Active Driving Display
Approaching Vehicle Audible System (AVAS)
MyMazda App Remote Engine Start
Mazda Connected Vehicle Viewer (MCVV)
Transmission Selector Lever Operation Change
Mazda intelligent Drive Select (Mi-Drive)
Hill Descent Control
AUTOHOLD
Hill Launch Assist (HLA)
Wireless Apple Carplay™ / Android Auto™
Wireless Qi Charger
Liftgate Lens Illumination
Power Liftgate Hands-free function
Remote Power Window
Electric Parking Brake (EPB)
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MAZDA CONNECT Power Function
Power Door Locks
Proximity Type Auto Lock Function
Transmitter Battery Saving Function
Keyless Entry Using Auxiliary Key
Occupant Comfort
Rear Seat Alert
Maintenance Mode
Connected Vehicle Maintenance Mode
Engine Maintenance Mode
Front Wiper Service Position
Rear Brake Maintenance Mode
PHEV 355V High Voltage Shutdown Before Service
M Hybrid Boost 48V High Voltage Shutdown Before Service
• USB Type C Flash Drive
• Web-Based Training Courses
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Item

Service Information

Fuse to be Installed at PDI
Fuse F1 (25A) is removed from the engine compartment
drivers side fuse block.
NOTE:

Fuse Block (Engine Compartment Drivers Side)

• Make sure the fuse is fully installed into position and
flush with all of the other fuses.
• Check for the Connected Vehicle signal after installing
fuse F1. The connectivity signal bar looks like a vertical
stack bar on the bottom right corner of the screen and
should be white as shown below to be working
properly. This bar is not displayed on the "Home"
screen, but on the "Entertainment" or "Navigation"
menu.

• The following instrument cluster error messages may
appear prior to PDI completion. The error messages
will clear after fuse F1 is installed.
In-Vehicle Network Malfunction. Have the Vehicle Inspected

Driver Attention Alert Disabled

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Key Transmitter and Auxiliary Key
Vehicles arrive at the dealer with auxiliary keys and key
transmitters located in the front cup holders.

SA-016/23
Temporary Lost Key Procedure
See Owner's Manual -> Opening/closing -> Key

NOTE:
• Key machine software update coming soon to support
the CX-90.
Except CX-50, CX-90, 5 digit
key code

CX-50, CX-90, 4 digit key
code and a plastic bar code
tag

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• Disgard the plastic bar code tag during PDI. The plastic
bar code tag is used during vehicle production and is
not needed by the customer.
• If additional auxiliary metal keys are needed, the key
machine will require a 5-digit code. Just add “5” as the
1st digit to make the 4-digit to 5-digit.
The auxiliary keys need to be inserted into the key
transmitters during PDI.
Remove the transmitter lower
cover by sliding the knob in
the direction shown and then
sliding the cover in the
opposite direction.

Insert the auxiliary key.

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Install the transmitter lower
cover by inserting the tabs of
the lower cover into the slots
of the transmitter.

Transmitter Note:

• If one transmitter is lost, inform the customer to take
cautions not to lose the 2nd transmitter.
• If both transmitters are lost, the vehicle will be disabled
and MDARS will need to be used to program new
transmitters.
• Replacement battery type is CR2032 (3V, 225mAh),
which is different then previous 6th generation
transmitter battery type CR2025 (3V, 160mAh). If the
wrong battery is installed, the transmitter might not
work properly (malfunction).
When a CX-90 VIN is input into the Immobilizer (Code
Word application you will have two Out Code fields.
Outcode #1 and Outcode #2 from MDARS should be
entered in these fields.

Immobilizer (Code Word)
CX-90 has 32 character immobilizer in and out codes (2 sets
of 16 characters).

Once retrieved, there will be an "Incode1" and "Incode2"
that will need to be entered into MDARS.

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Theft-Deterrent System
If the theft-deterrent system detects an inappropriate entry
into the vehicle, which could result in the vehicle or its
contents being stolen, the alarm alerts the surrounding area of
Owner's Manual -> Opening / Closing -> Security System an abnormality by sounding the horn and flashing the hazard
> Theft-Deterrent System
warning lights.
The system will not function unless it's properly armed. So
when you leave the vehicle, follow the arming
procedure correctly.
MGSS -> Mazda M Hybrid Boost

Mazda M Hybrid Boost (Inline 6 cylinder)
M hybrid boost uses kinetic energy generated during
deceleration to charge the M hybrid boost battery
which generates power using a motor with excellent power
generation efficiency. Using the electrical power stored in the
M hybrid boost battery, a high-capacity storage battery,
contributes to improved driving performance and fuel
economy by reducing engine load and performing motor
assist. In addition, restarting the engine from the istop status
using the motor achieves quiet performance.
1. Vehicle Front
2. Motor
3. M hybrid boost battery (48 volts LiB Pack)
4. DC-DC Converter (M Hybrid Boost)
MGSS -> EV SYSTEM OUTLINE
Plug-In Hybrid Electric Vehicle (PHEV) System Outline
(Inline 4 cylinder)
• The motor is integrated between the longitudinal
engine and the transmission, and a two-clutch, onemotor parallel hybrid system that transmits drive force
through the clutch has been adopted.
• A plug-in hybrid system that can be can be recharged
from an external power source has been adopted

1. Lead-acid Battery
2. Engine
3. Motor

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4. Transmission
5. Sub-battery
6. PCM
7. High voltage (for drive) battery (355 volts LiB Pack)

8. BECM
9. Charging port electrical supply unit
10. Charging control unit
11. 1500W PSU
12. DC/DC converter
13. Inverter
14. Drive Motor Control Module
15. Electronically controlled brake unit
High Voltage Battery Service Cautions
Inner Service of High Voltage Battery (LiB Pack for PHEV:
355 volts) should NOT be handled by Dealer Technicians for
SAFETY reason. Also, NO Inner Service for 48 volts LiB Pack
is allowed.
High Voltage Battery Maintenance
For new vehicles in stock at the dealer, inspect and maintain
the high voltage battery periodically.

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SA-018/23

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View from the bottom of
PHEV LiB Package

P-N Terminals

PHEV 355V High Voltage Shutdown Before Service
CAUTION: Technician Hybrid & EV Specialist Cerfitication
is required.
Always make sure to follow the MGSS High Voltage
Shutdown procedure before servicing the vehicle.
1) Confirm No charging cable at the charging connector.
2) Open the Driver’s side door.
3) IG ON (READY LAMP ON) and wait for 3 seconds or more.
4) IG OFF (READY LAMP OFF) and wait for 5 minutes
(Wait for stop of Electric fan if moving even after 5 minutes.)
5) Remove minus terminal at 12 volts Lead-acid battery
within 25 minutes after IG OFF (then, Driver’s door can
be closed.) and wait for more 1 minute.
6) Remove SERVICE PLUG with electrical insulating gloves.
7) Leave 10 minutes or more for electric discharge.
8) Check NO voltage at INVERTER Harness connection (P-N
terminals) in PHEV LiB Package with electrical
insulating gloves.
9) In case of removing OBC &/or 1500W Power Supply
after OBC Contactor, Check NO voltage at P-N terminals
at 1500W Power Supply coupler with electrical
insulting gloves.
1500W Power Supply

P-N Terminals
Volt Meter to use Max DC
450V

M Hybrid Boost 48V High Voltage Shutdown Before
Service
Always make sure to follow the MGSS High Voltage
Shutdown procedure before servicing the vehicle.
1) IG OFF (READY LAMP OFF) and confirm stopping the
Engine.
2) Leave 30 seconds or more.
3) Remove minus terminal at 12 volts Lead-acid battery.

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High Voltage Battery Replacement
If MGSS diagnosis leads to a high voltage battery
replacement, contact Hotline for technical support.
CAUTION: DO NOT perform MGSS HIGH VOLTAGE
BATTERY REMOVAL/INSTALLATION.

Back Up Sub Battery for e-SKYACTIV PHEV
PHEV models have a Sub Battery for backup power to
several systems when losing their electric supply from the
main battery. The Backup Power Supply Battery (BPS)
1. PCM
is located under the passenger-side foot support.
2. BPS Unit
Inspection at regularly scheduled maintenance intervals and
3. Sub Battery
additional charging is NOT necessary. If the Warning light/
DTC (P143B:00) is found based on the voltage down from the
BPS, replace the Sub Battery following the procedures in
the Workshop Manual.

PHEV Refueling Procedure
1. Press the Fuel lid opener switch on the cluster panel

2. "Prepairing for refueling" is displayed on the instrument
cluster.
3. Wait for instrument cluster to display "Ready to Refuel".
This will take 1~10 seconds.
4. Fuel Filler Lid unlocks after "Ready to Refuel" is displayed.
PHEV Instrument Cluster Battery Range
Battery range shows 1mi even enough Battery State of
Charge (SOC) is high.

NOTE: If the customer leaves the vehicle with the fuel lid
door open for 10-20 min, the on-board fuel tank vapor
recovery system will re-seal itself. Then when the customer
tries to refuel the vehicle, the pump dispenser may click off
due to pressure in the fuel tank.
To reset the system:
1. Install the fuel cap and close the fuel lid.
2. Turn the vehicle on with the START pushbutton and
when the READY indicator turns ON, turn the
vehicle off.
3. Press the fuel lid opener button and start the
process over again.
Under low temperature environment, the engine output
characteristics decrease significantly due to the
characteristics of Lithium-ion Battery (LiB). Therefore, even
though the SOC remains enough, when the motor output is
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lower than the threshold of battery output (*), the drive
mode is switched from EV mode to HEV mode, and the
maximum driving distance display shows 1 mile (1 km) as