ECU KIA NIRO HYBRID EV 2021 Service Manual

Maintenance
16 7
Vacuum crankcase ventilation
hoses
Inspect the surface of hoses for evi-
dence of heat and/or mechanical
damage. Hard and brittle rubber,
cracking, tears, cuts, abrasions, and
excessive swelling indicate deterio-
ration. Particular attention should be
paid to examine those hose surfaces
nearest to high heat sources, such
as the exhaust manifold.
Inspect the hose routing to assure
that the hoses do not come in con-
tact with any heat source, sharp
edges or moving component which
might cause heat damage or
mechanical wear. Inspect all hose
connections, such as clamps and
couplings, to make sure they are
secure, and that no leaks are pres-
ent. Hoses should be replaced
immediately if there is any evidence
of deterioration or damage.
Air cleaner filter
A Genuine Kia air cleaner filter is
recommended when the filter is
replaced.
Spark plugs
Make sure to install new spark plugs
of the correct heat range.
Cooling system
Check the cooling system compo-
nents, such as the radiator, coolant
reservoir, hoses and connections for
leakage and damage. Replace any
damaged parts.
Coolant (Engine / Inverter)
The coolant should be changed at
the intervals specified in the mainte-
nance schedule.
Dual clutch transmission Fluid
Inspect the dual clutch transmission
fluid according to the maintenance
schedule.
Brake hoses and lines
Visually check for proper installation,
chafing, cracks, deterioration and
any leakage. Replace any deteriorat-
ed or damaged parts immediately.

Maintenance
24 7
✽
✽
NOTICE
Make sure the coolant cap is proper-
ly closed after refill of coolant.
Otherwise the engine could be over-
heated while driving.
1. Check if the radiator cap label is
straight front.2. Make sure that the tiny protru-
sions inside the coolant cap
should be securely interlocked.WARNING
Radiator cap
Do not remove the radiator cap
when the engine and radiator
are hot. Scalding hot coolant
and steam may blow out under
pressure which may result in
serious injury.
OQL075072
■Engine room front view
ODE076007
■Engine room rear view

731
Maintenance
Checking the parking brake
(if equipped)
Check whether the stroke is within
specification when the parking brake
pedal is depressed with 66 lb, 294 N
(30 kg) of force. Also, the parking
brake alone should securely hold the
vehicle on a fairly steep grade. If the
stroke is more or less than specified,
have the parking brake adjusted by
an authorized Kia dealer.
Stroke : 6~7 notch
PARKING BRAKE
OJF055017

739
Maintenance
BATTERY (PLUG-IN HYBRID)
For best battery service
Keep the battery securely mount-
ed.
Keep the battery top clean and dry.
Keep the terminals and connec-
tions clean, tight, and coated with
petroleum jelly or terminal grease.
Rinse any spilled electrolyte from
the battery immediately with a
solution of water and baking soda.
If the vehicle is not going to be
used for an extended time, discon-
nect the battery cables.Always read the following
instructions carefully when
handling a battery.
If any electrolyte gets into
your eyes, flush your eyes
with clean water for at least
15 minutes and get immedi-
ate medical attention.
If electrolyte gets on your
skin, thoroughly wash the
contacted area. If you feel
pain or burning sensation,
get medical attention imme-
diately.
An inappropriately disposed
battery can be harmful to the
environment and human
health. Dispose the battery
according to your local law(s)
or regulation.
The battery contains lead. Do
not dispose of it after use.
Please return the battery to
an authorized Kia dealer to
be recycled.
Never attempt to recharge the bat-
tery when the battery cables are con-
nected.
WARNING- Risk of
explosion
Keep lit cigarettes and
all other flames or
sparks away from the
battery.
The battery contains
hydrogen -- a highly
combustible gas which
will explode if it comes
in contact with a flame or
spark.
Keep batteries out of the
reach of children
because batteries con-
tain highly corrosive
SULFURIC ACID and
electrolytes. Do not
allow battery acid to
contact your skin, eyes,
clothing or paint finish.
Wear eye protection
when charging or work-
ing near a battery.
Always provide ventila-
tion when working in an
enclosed space.
ODEP079016

759
Maintenance
✽ ✽
NOTICE
• When replacing fuse, turn the
ignition “OFF” and turn off
switches of all electrical devices
then remove battery (-) terminal.
• The actual fuse/relay panel label
may differ from equipped items.
Inner panel fuse replacement
1. Turn the engine start/stop button
to the OFF position and all other
switches off.
2. Open the fuse panel cover.
If the switch is located in the “OFF”
position, a caution indicator will be
displayed in the cluster.
WARNING- Electrical Fire
Always ensure replacements
fuses and relays are securely
fastened when installed. Failure
to do so can result in a vehicle
fire.
CAUTION
When replacing a blown fuse
or relay, make sure the new
fuse or relay fits tightly into
the clips. Failure to tightly
install the fuse or relay may
cause damage to the wiring
and electric systems.
Do not remove fuses, relays
and terminals fastened with
bolts or nuts. The fuses, relays
and terminals may not be fas-
tened correctly which may
cause vehicle damage.
ODEP079017

761
Maintenance
Fuse switch
Always set the fuse switch to the ON
position before using the vehicle.
If you move the switch to the OFF
position, some items such as audio
and digital clock must be reset and
transmitter (or smart key) may not
work properly. When the switch is
Off, the caution indicator will be dis-
played on the instrument cluster.
Always place the fuse switch in the
ON position while driving the vehicle.
If the switch is located in the “OFF”
position, a caution indicator will be
displayed in the cluster.
Engine compartment fuse
replacement
1. Turn the engine start/stop button
to the OFF position and all other
switches off.
2. Remove the fuse panel cover by
pressing the tab and pulling the
cover up. When the blade type
fuse is disconnected, remove it by
using the clip designed for chang-
ing fuses located in the engine
compartment fuse box. Upon
removal, securely insert reserve
fuse of the same rating.
ODEP079018
ODEP079021
CAUTION - Fuse Panel
Covers
Set all switches to ON before
driving.
If the vehicle is going to be
unused for over 1 month, set
all switches to OFF to prevent
the batteries from draining.
The contact points of the
switches may wear out with
excessive use. Please refrain
from excessive use of the
switches (except for long-term
parking for over 1 month).

Maintenance
62 7
3. Check the removed fuse; replace it
if it is blown. To remove or insert
the fuse, use the fuse puller in the
engine compartment fuse panel.
4. Push in a new fuse of the same
rating, and make sure it fits tightly
in the clips. If it fits loosely, consult
an authorized Kia dealer.Multi fuse
If the multi fuse is blown, it must be
removed as follows:
1. Turn off the engine.
2. Disconnect the negative battery
cable.
3. Remove the nuts shown in the pic-
ture above.
4. Replace the fuse with a new one
of the same rating.
5. Reverse these steps to reinstall
the multi fuse.
✽ ✽
NOTICE
Do not disassemble nor assemble the
multi fuse when it is secured with
nuts and bolts. Incorrect or partial
assembly torque may cause a fire.
Have the vehicle checked by an
authorized Kia dealer.
ODEP079022
CAUTION
After checking the fuse panel in
the engine compartment,
securely install the fuse panel
cover to protect against any
electrical failure which may
occur from water contact. Listen
for the audible clicking sound to
ensure the fuse panel cover is
securely fastened.

763
Maintenance
Main fuse (Plug-in Hybrid)
If the multi fuse is blown, it must be
removed as follows:
1. Turn off the engine.
2. Disconnect the negative battery
cable.
3. Remove the nuts shown in the pic-
ture above.
4. Replace the fuse with a new one
of the same rating.
5. Reverse these steps to reinstall
the multi fuse.
✽ ✽
NOTICE
The electronic system may not func-
tion correctly even when the engine
compartment and internal fuse
box’s individual fuses are not dis-
connected. In such case the cause of
the problem may be disconnection
of the main fuse (BFT type), which is
located inside the positive battery
terminal (+) cap.
Since the main fuse is designed more
intricately than other parts, have the
vehicle checked by an authorized
Kia dealer.
✽ ✽
NOTICE- Remodeling
Prohibited
Do not rewire your vehicle in any
way as doing so may affect the per-
formance of several safety features
in your vehicle. Rewiring your vehi-
cle may also void your warranty and
cause you to be responsible for any
subsequent vehicle damage which
may result.
CAUTION
Visually inspect the battery cap
to ensure it is securely closed.
If the battery cap is not securely
closed, moisture may enter the
system and damage the electri-
cal components.
WARNING- Random
wiring prohibited when
retrofitting equipment
Use of random wiring in the
vehicle might cause danger due
to failure and damage of the
vehicle’s performance.
Using random wires especially
when retrofitting AVN or theft
alarm system, remote engine
control, car phone or radio
might damage the vehicle or
cause fire.
ODEP079023

Maintenance
66 7
Instrument panel (Driver’s side fuse panel) (Hybrid)
Fuse NameFuse ratingCircuit Protected
MODULE 510AElectro Chromic Mirror, Audio/Video & Navigation Head Unit, Audio, Shift Lever Indicator, Air Conditioner
Control Module, Rear Seat Warmer Control Module, Front Air Ventilation Seat Control Module, Front Seat
Warmer Control Module, Head Lamp Leveling Device Actuator LH/RH, Crash Pad Switch, AMP (Amplifier)
MODULE 410ALane Keeping Assist Control Module, Crash Pad Switch, Blind-Spot Collision Warning (BCW) Radar Left
Handle side/Right Handle side, EPB, VESS, Front Seat Warmer Control Module
INTERIOR
LAMP10AFront Vanity Lamp LH/RH, Room Lamp, Overhead Console Lamp, Luggage Lamp, Mood Lamp, BCM,
Wireless Charger
A/BAG15APassenger Occupant Detection Sensor, ACU
IG 125AEngine Room Junction Block (Fuse - DCT4, HPCU2, ACTIVE HYDRAULIC BOOSTER3, ECU3)
CLUSTER10AInstrument Cluster
MODULE 310ABCM (Body Control Module), DCT (Dual Clutch Transmission) Shift Lever, Stop Lamp Switch, Driver Door
Module, Passenger Door Module
MEMORY 27.5AActive Air Flap Unit, VESS
MODULE 810AActive Air Flap Unit, Electric Water Pump (Engine), Engine Room Junction Block (Battery C/Fan Relay),
BMS (Battery Management System) Control Module
A/BAG IND7.5AAir Conditioner Control Module, Instrument Cluster
START7.5A[With Smart Key/With Immobilizer] Inhibitor Switch

775
Maintenance
Engine room compartment fuse panel (Hybrid)
Fuse NameFuse ratingCircuit Protected
MULTI FUSE
B+ 560AFuse - BATTERY C/FAN, HORN, ECU2, Engine Control Relay
B+ 260AInstrument Panel Junction Block (Fuse - S/HEATER (REAR))
B+ 360AInstrument Panel Junction Block
B+ 450AInstrument Panel Junction Block (Fuse - BATTERY MANAGEMENT, P/WINDOW (LH), P/WIN-
DOW (RH), TAIL GATE OPEN, SUNROOF, AMP, S/HEATER (FRT), P/SEAT (DRV))
COOLING FAN60ACooling Fan Relay
REAR HEATED50ARear Heated Relay
BLOWER40ABlower Relay
IG 140A[Without Smart Key] Ignition Switch, [With Smart Key] PDM1 (ACC) Relay, PDM2 (IG1) Relay
IG 240A[Without Smart Key] Ignition Switch, [With Smart Key] PDM3 (IG2) Relay
MDPS80AMDPS (Motor Driven Power Steering) Unit
PTC
HEATER 150APTC Heater 1 Relay
PTC
HEATER 250APTC Heater 2 Relay
CLUTCH
ACTUATOR40AClutch Actuator (HEV)
MAIN150AFuse - H/LAMP HI, INVERTER, ACTIVE HYDRAULIC BOOSTER1, ACTIVE HYDRAULIC
BOOSTER2, WIPER RR, EPB1, EPB2