2002 MAZDA 6 low oil pressure

D–6
OUTLINE, LUBRICATION SYSTEM
SUPPLEMENTAL SERVICE INFORMATIONA6E330202000204•The following changes and/or additions have been made since publication of the Mazda6 Workshop Manual
(1730-1*-02C).
Oil pressure
•Inspection procedure has been adopted. (MZR-CD (RF Turbo) engine model)
Engine oil
•Inspection procedure has been adopted. (MZR-CD (RF Turbo) engine model)
•Replacement procedure has been adopted. (MZR-CD (RF Turbo) engine model)
Oil filter
•Replacement procedure has been adopted. (MZR-CD (RF Turbo) engine model)
Oil cooler
•Removal/Installation procedure has been adopted. (MZR-CD (RF Turbo) engine model)
Oil pan
•Removal/Installation procedure has been adopted. (MZR-CD (RF Turbo) engine model)
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LOCATION INDEXA6E333014100201MZR-CD (RF Turbo)
.
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OUTLINE
LUBRICATION SYSTEM
4
3
1
2
A6E3300W003
1 Oil pressure switch
(See D–7 OIL PRESSURE INSPECTION)
2 Oil filter
(See D–9 OIL FILTER REPLACEMENT)3 Oil cooler
(See D–9 OIL COOLER REMOVAL/
INSTALLATION)
4 Oil pan
(See D–10 OIL PAN REMOVAL/INSTALLATION)

F1–2
OUTLINE
OUTLINE OF CONSTRUCTIONA6E390218881201•The fuel and emission control systems are essentially carried over from the current Mazda6 (GG), except for
the following features. (See Mazda6 Training Manual 3359-1*-02C.)
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FEATURESA6E390218881202System simplification
•Controller area network has been adopted with TCM communication (4WD).
TCM adoption
•DTC for CAN (TCM communication) has been adopted.
Modifications to match the vehicle characteristics
•The idle speed has been modified.
•Fuel pump (transfer) has been adopted.
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SPECIFICATIONSA6E390218881203
*1: Without the BARO sensor
*2: With the BARO sensor
Bold frames: New specifications
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OUTLINE
Item 2WD 4WD
Air cleaner element Type Paper element (oil permeated)
IAC valve Type Duty control
Fuel injectorType Hi-ohmic
Type of fuel delivery Top-feed
Type of drive Voltage
Pressure regulatorRegulating pressure
(kPa {kgf/cm
2, psi})440 {4.5, 64}
Fuel tankCapacity
(L {US qt, lmp qt})64 {68, 56} 62 {65, 54}
Fuel SpecificationUnleaded
(RON 90*
1/95*2 or above)Unleaded (RON 95 or above)
Catalyst Type TWC (monolythic)
EGR control Type Stepping motor type
Evaporative emission control
systemType Canister type
PCV system Type Closed type

OUTLINE
F1–3
F1
CONTROL SYSTEM DIAGRAM (4WD)A6E390218881204
.
* : Equipped for L3 engine modelEnd Of Sie
9
8
7
54
3
10
19
18
17
15
16
14
13
11
12
20
29
28
27
25
26
24
23
21
22
30
3938
3735
33
36
31
32
40
6
1
2
3441
A6E39022000
1PCM
2 Ignition coil
3 Generator
4* VAD shutter valve
5 Air cleaner
6 MAF sensor
7* VAD shutter valve actuator
8* VAD control solenoid valve
9* Vacuum chamber
10* VAD check valve (one-way)
11 IAC valve
12 Purge solenoid valve
13 TP sensor
14 MAP sensor
15* VIS control solenoid valve
16 Variable tumble control solenoid valve
17* VIS shutter valve actuator
18* VIS shutter valve
19 VTCS shutter valve actuator
20 VTCS shutter valve
21 Fuel injector22* OCV
23 CMP sensor
24 EGR valve
25 Knock sensor
26 ECT sensor
27 PCV valve
28 CKP sensor
29 HO2S (front)
30 HO2S (rear)
31 Charcoal canister
32 Check valve (two-way)
33 Pressure regulator
34 Fuel filter (high-pressure)
35 Fuel pump
36 Fuel filter (low-pressure)
37 Fuel tank
38 Rollover valve
39 Pulsation damper
40 Fuel pump (transfer)
41 To PCM

F1–6
OUTLINE
.
1AA
1Q
1Z
1AC
1K
1C1D 4M4R 4N4K 4H4E
4T 4C4U 1AD1B 1A 2AB4X
39
38
37
35
36
33
40
45
46
44
43
41
42
34
48
47
A6E39022002
33 Generator
34 Refrigerant pressure switch (middle)
35 PSP switch
36 Blower motor
37 Refrigerant pressure switch (high and low)
38 A/C switch
39 Brake switch
40 Brake light41 Ignition coil
42 Generator
43 Purge solenoid valve
44 VAD control solenoid valve
45 EGR valve
46 Variable tumble control solenoid valve
47 VIS control solenoid valve
48 OCV

F1–8
OUTLINE
.
15 Fuel injector No.2
16 Fuel injector No.3
17 Fuel injector No.4
18 IAC valve
19 Oxygen sensor heater (front)
20 Oxygen sensor heater (rear)
21 A/C relay22 Cooling fan relay
23 Cooling fan relay
24 Cooling fan relay
25 Cooling fan relay
26 Fuel pump relay
27 Ignition switch
28 Main relay
1AA
1Q
1Z
1AC
1K
1C1D 4M4R 4N4K 4H4E
4T 4C4U 1AD1B 1A 2AB4X
39
38
37
35
36
33
31
32
40
44
43
41
42
34
29
30
A6E39022004
29 Generator
30 Refrigerant pressure switch (middle)
31 PSP switch
32 Blower motor
33 Refrigerant pressure switch (high and low)
34 A/C switch
35 Brake switch
36 Brake light37 Ignition coil
38 Generator
39 Purge solenoid valve
40 VAD control solenoid valve
41 EGR valve
42 Variable tumble control solenoid valve
43 VIS control solenoid valve
44 OCV

F1–14
CONTROL SYSTEM
OUTLINEA6E394018880201•The control system is essentially carried over from the current Mazda6 (GG), except for the following. (See
Mazda6 Training Manual 3359-1*-02C.)
Vehicle Adoption
4WD ATX model
•TCM has been adopted. Due to this the PCM terminal of ATX device has been replaced to TCM. The ATX
device information which is needed by the fuel and emission control systems is communicated to the PCM by
the controller area network (CAN).
Unleaded (RON 90 or above) model
•BARO sensor has been eliminated. Due to this the BARO factor for purge control has been eliminated.
Input Device
×:Applicable
—: Not applicable
*
1: For MTX model
*2: With Immobilizer system
CONTROL SYSTEM
Item SignalMazda6 (GG, GY)
Remark for new model
4WD ATX Unleaded
(RON 90 or
above)Current
model
MAF/IAT sensor MAF and IAT×Same as current model
TP sensor TP×Same as current model
MAP sensor MAP×Same as current model
ECT sensor ECT×Same as current model
CMP sensorCylinder
identification×Same as current model
CKP sensor Engine revolution×Same as current model
Knock sensor Knocking×Same as current model
HO2S (Front, Rear)Oxygen
concentration×Same as current model
BARO sensor BARO×—×Same as current model
Neutral switch*
1Load/no load
distinction×Same as current model
Clutch switch*
1Load/no load
distinction×Same as current model
Brake switchBrake pedal
condition×Same as current model
PSP switchP/S oil pump load
condition×Same as current model
VSS Vehicle speed—×—
A/C switch, refrigerant
pressure switch (high,
low pressure)A/C operational×Same as current model
Refrigerant pressure
switch (middle
pressure)A/C compressor load×—×Same as current model
Battery Battery voltage×Same as current model
Generation voltage
(Generator terminal P)Generation voltage×Same as current model
Immobilizer unit*
2Immobilizer system
communication×—×Same as current model

CONTROL SYSTEM
F1–19
F1
CONTROL DEVICE AND CONTROL RELATIONSHIP CHARTA6E394018880204Input devices
x: Applicable
*
1: For unleaded fuel (RON 90 or above) model
*2: For MTX model
*3: For 2WD ATX model
Component
IAT sensor x x x xxxx×
MAF sensor x xx xxxxx
TP sensor x x x x x x x x
MAP sensor x x
ECT sensor xx xxx xxxxx x
CMP sensor x x
CKP sensor xxxxxxxxxxxxx
Knock sensor x
Front HO2S x x
Rear HO2S x
BARO sensor*
1x
Neutral switch*
2xxxx
Clutch switch*
2xxxxx
TR switch*
3xxxxx
Brake switch
PSP switch x x x
VSS×
A/C switch, refrigerant
pressure switch (high,
low pressure)xxx××
Refrigerant pressure
switch (middle pressure)×
Battery voltage x x x×
Generator terminal P
(Generation voltage)xxx×
ABS/TCS HU/CM×
Coil×
Idle air control (IAC)Variable air duct (VAD)
controlVariable intake-air
control (VIC)Variable tumble
control system (VTCS)Variable valve timing controlFuel injection controlFuel pump controlElectronic spark advance
(ESA) controlPurge controlEGR controlFront HO2S heater controlRear HO2S heater controlA/C cut-off controlElectrical fan controlGenerator controlTraction controlImmobilizer system

CONTROL SYSTEM
F1–37
F1
Without Using the SST
Caution
•The PCM terminal voltages vary with change in measuring conditions and vehicle conditions.
Always carry out a total inspection of the input systems, output systems, and PCM to determine
the cause of trouble. Otherwise, a wrong diagnosis will be made.
1. Measure the voltage at each terminal.
•If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s)
referring to the Action column in the terminal voltage table.
Terminal voltage table (Reference)
Terminal Signal Connected to Test conditionVoltage
(V)Action
1A IGT1Ignition coil (No. 1,
4 cylinders)•Inspect using the wave profile.
(See F1–44 Inspection Using An
Oscilloscope (Reference).)•Inspect ignition coil
•Inspect related
harness
1B IGT2Ignition coil (No. 2,
3 cylinders)•Inspect using the wave profile.
(See F1–44 Inspection Using An
Oscilloscope (Reference).)•Inspect ignition coil
•Inspect related
harness
1C GND GND Under any condition Below 1.0•Inspect related
harness
1D GND GND Under any condition Below 1.0•Inspect related
harness
1E—— — ——
1F—— — ——
1G BARO BARO sensor Ignition switch ON (at sea level)Approx.
4.1 V•Inspect BARO sensor
•Inspect related
harness
1H—— — ——
1I—— — ——
1JManifold absolute
pressureMAP sensorIgnition switch ON (Engine OFF)Approx.
4.1•Inspect MAP sensor
•Inspect related
harness
IdleApprox.
1.5
1K Brake Brake switchBrake pedal depressed B+•Inspect brake switch
•Inspect related
harness Brake pedal released Below 1.0
1L—— — ——
1M ECT ECT sensorIgnition switch
ONECT 20 °C
{68 °F}3.04—
3.14•Inspect ECT sensor
•Inspect related
harness ECT 60 °C
{140 °F}1.29—
1.39
1N—— — ——
1O—— — ——
1P MAF MAF sensorIgnition switch ONApprox.
0.7•Inspect MAF sensor
•Inspect related
harness
Idle (after warm up)Approx.
1.3
1B 1A
1E 1D
1C 1H 1G 1J
1F 1I 1M
1L 1N 1K 1T 1Q1P 1S
1O 1R 1W1V
1Z 1Y
1X1AC1AB
1AA 1AD1U 2B 2A
2E 2D
2C 2H 2G 2J
2F 2I 2M
2L 2N 2K 2T 2Q2P 2S
2O 2R 2W2V
2Z 2Y
2X2AC2AB
2AA 2AD2U 3B 3A
3E 3D
3C 3H 3G 3J
3F 3I 3M
3L 3N 3K 3T 3Q3P 3S
3O 3R 3W3V
3Z 3Y
3X3AA3U 4B 4A
4E 4D
4C 4H 4G 4J
4F 4I 4M
4L 4N 4K 4T 4Q4P 4S
4O 4R 4W4V
4Z 4Y
4X4AC4AB
4AA 4AD4U
A6A3940W002