2003 MAZDA MODEL B-SERIES ECU

To put your vehicle in P (Park):
²Come to a complete stop
²Move the gearshift lever and securely latch it in P (Park)
WARNING: Always set the parking brake fully and make sure
the gearshift is latched in P (Park). Turn the ignition to the
LOCK position and remove the key whenever you leave your
vehicle.
R (Reverse)
With the gearshift lever in R (Reverse), the vehicle will move backward.
Always come to a complete stop before shifting into and out of R
(Reverse).
N (Neutral)
With the gearshift lever in N (Neutral), the vehicle can be started and is
free to roll. Hold the brake pedal down while in this position.
(Overdrive)
The normal driving position for the
best fuel economy. Transmission
operates in gears one through
five.
(Overdrive) can be
deactivated by pressing the
transmission control switch on the end of the gearshift lever. This will
illuminate the O/D OFF lamp and activate Drive.
Drive (not shown)
Drive is activated when the transmission control switch is pressed.
²This position allows for all forward gears except overdrive.
²O/D OFF lamp is illuminated.
²Provides engine braking.
²Use when driving conditions cause excessive shifting from O/D to
other gears. Examples: city traffic, hilly terrain, heavy loads, trailer
towing and when engine braking is required.
²To return to O/D (overdrive mode), press the transmission control
switch. The O/D OFF lamp will not be illuminated.
²O/D (Overdrive) is automatically returned each time the key is turned
off.
O/D
ON/OFF
Driving
121

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
10 7.5A Speed control servo/amplifier assembly,
Generic Electronic Module (GEM), Shift
lock actuator, Turn signals, 4x4
11 7.5A Instrument cluster, 4x4, Main light switch,
Central Security Module (CSM), Generic
Electronic Module (GEM)
12 Ð Not used
13 20A Brake pedal position switch
14 10A Anti-lock Brake System (ABS) control
module
15 Ð Not used
16 30A Windshield wiper motor, Wiper HI/LO
relay, Wiper run/park relay
17 20A Cigar lighter, Data Link Connector (DLC)
18 Ð Not used
19 25A Powertrain Control Module (PCM) power
diode, Ignition, PATS (Passive Anti-Theft
System)
20 7.5A Generic Electronic Module (GEM), Radio
21 15A Hazard flasher
22 20A Auxiliary power socket
23 Ð Not used
24 7.5A Clutch Pedal Position (CPP) switch,
Starter interrupt relay
25 Ð Not used
26 10A Battery saver relay, Auxiliary relay box,
Restraint Central Module (RCM), Generic
Electronic Module (GEM), Instrument
cluster
27 Ð Not used
28 7.5A Generic Electronic Module (GEM), Radio
29 20A Radio
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144

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
30 Ð Not used
31 Ð Not used
32 Ð Not used
33 15A Headlamps, Daytime Running Lamps
(DRL) module, Instrument cluster
34 Ð Not used
35 15A Horn relay (if not equipped with a Central
Security Module)
36 Ð Not used
Power distribution box
The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle's main electrical systems
from overloads.
WARNING: Always disconnect the battery before servicing high
current fuses.
WARNING: To reduce risk of electrical shock, always replace
the cover to the Power Distribution Box before reconnecting
the battery or refilling fluid reservoirs.
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and specificationschapter.
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145

2.3L engine (if equipped)
The high-current fuses are coded as follows:
Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
1 50A** I/P fuse panel
2 Ð Not used
3 Ð Not used
4 Ð Not used
5 Ð Not used
6 50A** Anti-lock Brake System (ABS) pump
motor
7 30A* Powertrain Control Module (PCM)
8 20A* Central security module, Power door locks,
Remote entry
9 Ð Not used
10 Ð Not used
11 50A** Starter relay, Ignition switch
12 20A* Power windows
1234521 22 23 24
25 26 27 28
29 30 31 32
33 34 35 36
37 38 39 40
41 42 43 44
67891055
49 4854 53 52
515656 B
56 A
5050 B
50 A 47 4545 B
45 A
4646 B
46 A 11 12 13 14 15
16 17 18 19 20
Roadside Emergencies
146

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
13 Ð Not used
14 Ð Not used
15 Ð Not used
16 40A** Blower motor
17 20A** Auxiliary cooling fan
18 Ð Not used
19 Ð Not used
20 Ð Not used
21 10A* PCM memory
22 Ð Not used
23 20A* Fuel pump motor
24 30A* Headlamps
25 10A* A/C clutch relay
26 Ð Not used
27 Ð Not used
28 30A* ABS module
29 Ð Not used
30 15A* Trailer Tow
31 20A* Foglamp, Daytime Running Lamps (DRL)
32 Ð Not used
33 15A* Park lamp, Central security module
34 Ð Not used
35 Ð Not used
36 Ð Not used
37 Ð Not used
38 10A* Left headlamp low beam
39 Ð Not used
40 Ð Not used
41 20A* Heated oxygen sensors
42 10A* Right headlamp low beam
43 Ð (Resistor)
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147

ENGINE OIL
Checking the engine oil
Refer to the service maintenance section for the appropriate intervals for
checking the engine oil.
1. Make sure the vehicle is on level ground.
2. Turn the engine off and wait a few minutes for the oil to drain into
the oil pan.
3. Set the parking brake and ensure the gearshift is securely latched in
P (Park) (automatic transmission) or 1 (First) (manual
transmission).
4. Open the hood. Protect yourself from engine heat.
5. Locate and carefully remove the engine oil level indicator (dipstick).
²2.3L I4 engine
Maintenance and Specifications
196

6. Fluid level should be at the
bottom of the opening.
7. Add enough fluid through the
filler opening so that the fluid
level is at the bottom of the
opening.
8. Install and tighten the fill plug
securely.
Use only fluid that meets Mazda specifications. Refer toLubricant
Specificationsin this chapter.
Checking and adding transfer case fluid (if equipped)
Vehicle must be on level surface.
1. Clean the filler plug.
2. Remove the filler plug and
inspect the fluid level.
3. Assure the vehicle cannot move.
4. Add only enough fluid through
the filler opening so that the
fluid level is at the bottom of
the opening.

Maintenance and Specifications
226

SNOW TIRES AND CHAINS
WARNING: Driving too fast for conditions creates the
possibility of loss of vehicle control. Driving at very high speeds
for extended periods of time may result in damage to vehicle
components.
NOTE:Snow tires must be the same size and grade as the tires you
currently have on your vehicle.
The tires on your vehicle have all weather treads to provide traction in
rain and snow. However, in some climates, you may need to use snow
tires and chains. If you need to use snow tires and chains, it is
recommended that steel wheels are used of the same size and
specifications as those originally installed.
Follow these guidelines when using snow tires and chains:
²Do not use tire chains on aluminum wheels. Chains may chip the
wheels.
²Use only SAE Class S chains.
²Install chains securely, verifying that the chains do not touch any
wiring, brake lines or fuel lines.
Drive cautiously. If you hear the cables rub or bang against the
vehicle, stop and retighten them. If this does not work, remove
the cables to prevent vehicle damage.
²If possible, avoid fully loading your vehicle.
²Remove the tire chains when they are no longer needed. Do not use
tire chains on dry roads.
²The suspension insulation and bumpers will help prevent vehicle
damage. Do not remove these components from your vehicle when
using snow tires and chains.
Maintenance and Specifications
231