ECU TOYOTA AYGO 2021 Repair Manual

4217-3. Do-it-yourself maintenance
7
Maintenance and care
AYGO_OM_Europe_OM9A012E
11ECU-B NO.4*17.5Multi-mode manual transmission
12AM2 NO.27.5Multiport fuel injection system/sequential
multiport fuel injection system
13AM2 NO.37.5Smart entry & start system
14ICS*27.5Charging system
15ST30Starting system
16STRG LOCK7.5Steering lock system
17H-LP-MAIN25H-LP RH-LO, H-LP LH-LO, H-LP RH-HI,
H-LP LH-HI
18WIPER-S*27.5Multiport fuel injection system/sequential
multiport fuel injection system
19STA7.5
Multiport fuel injection system/sequential
multiport fuel injection system, starting
system, multi-mode manual transmis-
sion, Stop & Start system
20ECU-B NO.315Audio system, smart entry & start system
21ECU-B NO.17.5Gauges and meters
22ECU-B NO.27.5Vehicle stability control system
23J/B60Instrument fuse box
24ALT125
DEF, S/HTR F/R, S/HTR F/L, CANVAS
TOP, ABS NO.1, ABS NO.2, RDI NO.1,
FOG FR, DRL
25AMT*150Multi-mode manual transmission
BBC*240Stop & Start system
FuseAmpereCircuit

4237-3. Do-it-yourself maintenance
7
Maintenance and care
AYGO_OM_Europe_OM9A012E■
Driver ’s side instrument panel
FuseAmpereCircuit
1IG1 NO.25
Back-up light, multiport fuel injection sys-
tem/sequential multiport fuel injection
system, audio system, vehicle stability
control system
2WASHER15Windshield washer, rear window washer
3ECU-IG NO.15
Main body ECU, gauges and meters, air
conditioning system, rear window defog-
ger, outside rear view mirror defoggers,
seat heaters, canvas top, audio system,
PCS system
4ECU-IG NO.25Electric power steering system, Stop &
Start system
5WIPER RR15Rear window wiper
6IG1 NO.15Electric cooling fan, anti-lock brake sys-
tem, vehicle stability control system
7WIPER25Windshield wiper
8MIR HTR10Outside rear view mirror defoggers
9P/OUTLET15Power outlet
10ECU-ACC7.5Outside rear view mirrors, audio system,
Stop & Start system, gauges and meters

4247-3. Do-it-yourself maintenance
AYGO_OM_Europe_OM9A012E
11IG2 NO.25
Steering lock system, multiport fuel injec-
tion system/sequential multiport fuel
injection system, multi-mode manual
transmission
12A/BAG7.5SRS airbag system
13METER5Gauges and meters, Stop & Start system
14IG2 NO.115Multiport fuel injection system/sequential
multiport fuel injection system, stop lights
15EFI NO.17.5
Multiport fuel injection system/sequential
multiport fuel injection system, Stop &
Start system
16OBD7.5On-board diagnosis system
17STOP10
Stop lights, high mounted stoplight, multi-
port fuel injection system/sequential mul-
tiport fuel injection system, anti-lock
brake system, vehicle stability control
system, multi-mode manual transmis-
sion, smart entry & start system
18TA I L10
Position lights, license plate lights, rear
fog light, front fog lights, tail lights, switch
illumination, multiport fuel injection sys-
tem/sequential multiport fuel injection
system, gauges and meters, audio sys-
tem
19HTR40Air conditioning system
20AM140HTR, OBD, A/C, TAIL, FOG RR, STOP,
P/W, DOOR F/L, DOOR F/R
21AM2 NO.130EFI NO.2, EFI-MAIN, D/L
22EFI NO.27.5Multiport fuel injection system/sequential
multiport fuel injection system
23EFI-MAIN20
EFI NO.1, multiport fuel injection system/
sequential multiport fuel injection system,
fuel pump
24D/L25Main body ECU, door lock system
25P/W30Power windows
FuseAmpereCircuit

4287-3. Do-it-yourself maintenance
AYGO_OM_Europe_OM9A012E■
Headlights
Turn the bulb base counter-
clockwise.
Unplug the connector while
pressing the lock release.
Replace the light bulb, and
install the bulb base.
Align the 3 tabs on the light bulb
with the mounting, and insert.
Turn and secure the bulb
base.
Shake the bulb base gently to
check that it is not loose, turn
the headlights on once and visu-
ally confirm that no light is leak-
ing through the mounting.
Replacing light bulbs

4367-3. Do-it-yourself maintenance
AYGO_OM_Europe_OM9A012E
■LED Lights
The front position lights, daytime running lights and tail lights consist of a
number of LEDs. If any of the LEDs burn out, take your vehicle to any autho-
rized Toyota retailer or Toyota author ized repairer, or any reliable repairer to
have the light replaced.
■ Condensation build-up on the inside of the lens
Temporary condensation build-up on the inside of the headlight lens does not
indicate a malfunction. Contact any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer for more information in the follow-
ing situations:
● Large drops of water have built up on the inside of the lens.
● Water has built up inside the headlight.
WARNING
■Replacing light bulbs
● Turn off the lights. Do not attempt to replace the bulb immediately after
turning off the lights.
The bulbs become very hot and may cause burns.
● Do not touch the glass portion of the light bulb with bare hands. When it is
unavoidable to hold the glass portion, use and hold with a clean dry cloth
to avoid getting moisture and oils on the bulb.
Also, if the bulb is scratched or dropped, it may blow out or crack.
● Fully install light bulbs and any parts used to secure them. Failure to do so
may result in heat damage, fire, or water entering the headlight unit. This
may damage the headlights or cause condensation to build up on the lens.
■ To prevent damage or fire
● Make sure bulbs are fully seated and locked.
● Check the wattage of the bulb before installing to prevent heat damage.

4398-1. Essential information
8
When trouble arises
AYGO_OM_Europe_OM9A012E
If your vehicle has to be stopped in an
emergency
Steadily step on the brake pedal with both feet and firmly depress it.
Do not pump the brake pedal repeatedly as this will increase the effort
required to slow the vehicle.
Shift the shift lever to N.
If the shift lever is shifted to N
After slowing down, stop the vehicle in a safe place by the road.
Stop the engine.
If the shift lever cannot be shifted to N
Keep depressing the brake pedal with both feet to reduce vehicle
speed as much as possible.
Vehicles without a smart entry
& start system:
Stop the engine by turning the
engine switch to the “ACC”
position.
Vehicles with a smart entry &
start system:
To stop the engine, press and
hold the engine switch for 2
consecutive seconds or more,
or press it briefly 3 times or
more in succession.
Only in an emergency, such as if it becomes impossible to stop
the vehicle in the normal way, stop the vehicle using the follow-
ing procedure:
Press and hold for 2 seconds
or more, or press briefly 3 times
or more

4428-2. Steps to take in an emergency
AYGO_OM_Europe_OM9A012E
If your vehicle needs to be towed
If towing is necessary, we recommend having your vehicle
towed by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer or commercial towing service,
using a wheel-lift type truck or flatbed truck.
Use a safety chain system for all towing, and abide by all state/
provincial and local laws.
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ When towing the vehicle
■ While towing
● When towing using cables or chains, avoid sudden starts, etc., which
place excessive stress on the towing eyelets, cables or chains. The towing
eyelets, cables or chains may become damaged, broken debris may hit
people, and cause serious damage.
● Do not turn the engine switch to the “LOCK” position (vehicles without a
smart entry & start system) or off (vehicles with a smart entry & start sys-
tem).
There is a possibility that the steering wheel is locked and cannot be oper-
ated.
■ Installing towing eyelets to the vehicle
Make sure that towing eyelets are installed securely.
If not securely installed, towing eyelets may come loose during towing.
Be sure to transport the vehicle with the
front wheels raised or with all four wheels
raised off the ground.
If the vehicle is towed with the front
wheels contacting the ground, the drive-
train and related parts may be damaged.

4438-2. Steps to take in an emergency
8
When trouble arises
AYGO_OM_Europe_OM9A012E
The following may indicate a problem with your transmission. Contact
any authorized Toyota retailer or Toyota authorized repairer, or any
reliable repairer or commercial towing service before towing.
● The engine is running but the vehicle does not move.
● The vehicle makes an abnormal sound.
NOTICE
■To prevent damage to the vehicle when towing using a wheel-lift type
truck
● Vehicles without a smart entry & start system: Do not tow the vehicle from
the rear when the engine switch is in the “LOCK” position or the key is
removed.
The steering lock mechanism is not strong enough to hold the front wheels
straight.
● Vehicles with a smart entry & start system: Do not tow the vehicle from the
rear when the engine switch is off. The steering lock mechanism is not
strong enough to hold the front wheels straight.
● When raising the vehicle, ensure adequate ground clearance for towing at
the opposite end of the raised vehicle. Without adequate clearance, the
vehicle could be damaged while being towed.
■ To prevent damage to the vehicle when towing with a sling-type truck
Do not tow with a sling-type truck, either from the front or rear.
■ To prevent damage to the vehicle during emergency towing
Do not secure cables or chains to the suspension components.
Situations when it is necessary to contact dealers before towing
Towing with a wheel-lift type truck
From the frontFrom the rear
Release the parking brake. Use a towing dolly under the
front wheels.

4448-2. Steps to take in an emergency
AYGO_OM_Europe_OM9A012E
When using a flat-bed truck to transport the vehicle, use tire strapping
belts. Refer to the owner's manual of the flat-bed truck for the tire
strapping method.
In order to suppress vehicle movement during transportation, set the
parking brake and turn the engine switch to the “LOCK” position (vehi-
cles without a smart entry & start system) or off (vehicles with a smart
entry & start system).
If a tow truck is not available in an emergency, your vehicle may be
temporarily towed using cables or chains secured to the emergency
towing eyelets. This should only be attempted on hard surfaced roads
for at most 80 km (50 miles) at under 30 km/h (18 mph).
A driver must be in the vehicle to steer and operate the brakes. The
vehicle’s wheels, drive train, axles, steering and brakes must be in
good condition.
NOTICE
■ Towing with a sling-type truck
Using a flatbed truck
Emergency towing
Do not tow with a sling-type truck to pre-
vent body damage.

4458-2. Steps to take in an emergency
8
When trouble arises
AYGO_OM_Europe_OM9A012E
To have your vehicle towed by another vehicle, the towing eyelet must
be installed to your vehicle. Install the towing eyelet using the follow-
ing procedure.
Take out the wheel bolt wrench (if equipped) and towing eyelet.
( P. 461, 482)
Push the lower left of the eyelet
cover and then open it.
Insert the towing eyelet into the
hole and tighten partially by
hand.
Tighten down the towing eyelet
securely using a wheel bolt
wrench (if equipped) or hard
metal bar.
To prevent damaging the front
bumper, wrap the wheel bolt
wrench with a rag as shown in the
illustration.
Emergency towing procedure