2002 MAZDA 6 fuel pressure

F2–24
CONTROL SYSTEM, ON-BOARD DIAGNOSTIC
CONTROLLER AREA NETWORK (CAN)A6E404018881206Outline
•The PCM transmit/received the information other units using CAN to simplify the system.
Transmit Information
•Engine speed
•Vehicle speed
•Accelerator pedal position
•Fuel injection information
•Torque reduction inhibit
•Intake air temperature
•Engine coolant temperature
•Travelled distance
•Glow indicator light conditions
•Engine displacement
•Number of cylinders
•Air induction type
•Fuel type and delivery
•Country
•Transmission/axle type
•Tire circumference (front/rear)
•Cruise main indicator light conditions
•Cruise set indicator light conditions
Received Information
•Torque reduction request from DSC HU/CM
•Wheel speed from ABS HU/CM or DSC HU/CM
—Front left
—Front right
•Travelled distance from ABS HU/CM or DSC HU/CM
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OUTLINEA6E407018881201•The on-board diagnostic system is essentially carried over from that of the current MPV (LW) MZR-CD (RF
Turbo) engine models, except for the following. (See MPV Workshop Manual Supplement 1737-1*-02C.)
—DTCs, PID monitoring items, and simulation items have been changed.
—KOEO/KOER self-test items have been changed.
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DTCA6E407018881202
×: Applicable –: Not applicable
ON-BOARD DIAGNOSTIC
DTC Condition Detection condition MILMemory
function
P0016Crankshaft position-camshaft position
correlation malfunctionInput signals from CKP sensor and CMP sensor
are misaligned.××
P0088 Fuel pressure system too highFuel pressure is higher than preprogrammed
criteria.–×
P0091 Suction control valve circuit low inputInput voltage from suction control valve does not
change from off to on.××
P0092 Suction control valve circuit high inputInput voltage from suction control valve does not
change from on to off.××
P0093 Fuel system leak detectionFuel pressure after fuel injection is lower than
preprogrammed criteria.××
P0097 IAT sensor No.1 circuit low input Input voltage from IAT sensor No.1 is below 0.1 V.××
P0098 IAT sensor No.1 circuit high input Input voltage from IAT sensor No.1 is above 5.0 V.××
P0102 MAF sensor circuit low input Input voltage from MAF sensor is below 0.2 V.××
P0103 MAF sensor circuit high input Input voltage from MAF sensor is above 4.9 V.××
P0107 Boost sensor circuit low inputInput voltage from boost sensor is below 1.9 V
when engine speed is 2,400 rpm or above and
accelerator opening angle is 50% or above.××
P0108 Boost sensor circuit high input Input voltage from boost sensor is above 4.9 V.××

ON-BOARD DIAGNOSTIC
F2–25
F2
P0112 IAT sensor No.2 circuit low input Input voltage from IAT sensor No.2 is below 0.1 V.××
P0113 IAT sensor No.2 circuit high input Input voltage from IAT sensor No.2 is above 5.0 V.××
P0117 ECT sensor circuit low input Input voltage from ECT sensor is below 0.1 V.××
P0118 ECT sensor circuit high input Input voltage from ECT sensor is above 5.0V.××
P0121Accelerator position sensor No.1 circuit
performance problemInput voltage from accelerator position sensor No.1
is above 1.3 V when accelerator pedal is
depressed.××
P0122Accelerator position sensor No.1 circuit
low inputInput voltage from accelerator position sensor No.1
is below 0.3 V.××
P0123Accelerator position sensor No.1 circuit
high inputInput voltage from accelerator position sensor No.1
is above 4.7 V.××
P0182 Fuel temperature sensor circuit low inputInput voltage from fuel temperature sensor is below
0.1 V.××
P0183 Fuel temperature sensor circuit high inputInput voltage from fuel temperature sensor is above
5.0 V.××
P0191Fuel pressure sensor circuit performance
problemPressure difference between actual fuel pressure
and target fuel pressure exceeds preprogrammed
criteria.××
P0192 Fuel pressure sensor circuit low inputInput voltage from fuel pressure sensor is below 0.4
V.××
P0193 Fuel pressure sensor circuit high inputInput voltage from fuel pressure sensor is above
4.8 V.××
P0200 Fuel injector circuit malfunction Injection confirmation signal is not input normally.××
P0221Accelerator position sensor No.2 circuit
performance problemVoltage difference between accelerator position
sensor No.1 and accelerator position sensor No.2
exceeds 0.9 V.××
P0222Accelerator position sensor No.2 circuit
low inputInput voltage from accelerator position sensor No.2
is below 0.3 V.××
P0223Accelerator position sensor No.2 circuit
high inputInput voltage from accelerator position sensor No.2
is above 4.7 V.××
P0300 Random misfire detectionInterval time of CKP sensor input signal exceeds
preprogrammed criteria.××
P0336 CKP sensor circuit performance problemInput signal from CKP sensor is not proper pulse
number.××
P0337 CKP sensor circuit low inputInput signal from CKP sensor is not input at 12
crankshaft revolutions.××
P0341 CMP sensor circuit performance problemInput signal from CMP sensor is not proper pulse
number.××
P0342 CMP sensor circuit low inputInput signal from CMP sensor is not input at 12
crankshaft revolutions.××
P0380 Glow plug relay circuit malfunctionInput voltage from glow plug relay is as following:
—1.0 V or below when glow plug relay is on.
—4.0 V or above when glow plug relay is off.××
P0504Brake switch signal correlation
malfunctionInput signal from brake switch 1 brake switch 2 is as
following:.
—Brake switch 1 is ON and brake switch 2 is ON.
—Brake switch 1 is OFF and brake switch 2 is
OFF.××
P0510 Idle switch circuit malfunctionInput voltage from idle switch is B+ when
accelerator position sensor No.1 voltage is below
0.7 V.××
P0512 Engine switch circuit malfunctionInput voltage from engine switch is B+ when engine
speed is 1,200 rpm or above.××
P0564 Cruise control signal malfunctionInput voltage from cruise control switch is as
following for 120 s:
—Below 0.1 V.
—1.4—1.9 V.
—3.7—3.9 V.
—4.5—4.6 V.××
P0602 PCM programming error No configuration data in PCM.××
P0606 PCM malfunction PCM does not read DTC from output devices.×× DTC Condition Detection condition MILMemory
function

LOCATION INDEX
F2–33
F2
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1 PCM (with built-in BARO sensor and immobilizer
unit)
(SeeF2–64 PCM REMOVAL/INSTALLATION)
(SeeF2–65 PCM INSPECTION)
(SeeF2–68 PCM CONFIGURATION)
2 Clutch switch
(SeeF2–68 CLUTCH SWITCH INSPECTION)
3 Neutral switch
(SeeF2–69 NEUTRAL SWITCH INSPECTION)
4 Idle switch
(SeeF2–70 IDLE SWITCH INSPECTION)
(SeeF2–71 IDLE SWITCH ADJUSTMENT)
5 Accelerator position sensor
(SeeF2–72 ACCELERATOR POSITION SENSOR
INSPECTION)
(SeeF2–73 ACCELERATOR POSITION SENSOR
ADJUSTMENT)
6 MAF/IAT sensor
(SeeF2–74 MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) SENSOR INSPECTION)
7 IAT sensor No.2
(SeeF2–75 INTAKE AIR TEMPERATURE (IAT)
SENSOR NO.2 INSPECTION)
8ECT sensor
(SeeF2–76 ENGINE COOLANT TEMPERATURE
(ECT) SENSOR REMOVAL/INSTALLATION)
(SeeF2–76 ENGINE COOLANT TEMPERATURE
(ECT) SENSOR INSPECTION)
9 Fuel temperature sensor
(SeeF2–77 FUEL TEMPERATURE SENSOR
INSPECTION)
10 Boost sensor
(SeeF2–78 BOOST SENSOR INSPECTION)
11 Fuel pressure sensor
(SeeF2–79 FUEL PRESSURE SENSOR
INSPECTION)
12 CMP sensor
(SeeF2–80 CAMSHAFT POSITION (CMP)
SENSOR REMOVAL/INSTALLATION)
(SeeF2–80 CAMSHAFT POSITION (CMP)
SENSOR INSPECTION)
13 CKP sensor
(SeeF2–81 CRANKSHAFT POSITION (CKP)
SENSOR REMOVAL/INSTALLATION)
(SeeF2–82 CRANKSHAFT POSITION (CKP)
SENSOR INSPECTION)
14 Calibration resistor
(SeeF2–83 CALIBRATION RESISTOR
INSPECTION)
15 IDM
(SeeF2–84 INJECTOR DRIVER MODULE (IDM)
INSPECTION)

F2–34
ENGINE TUNE-UP
ENGINE TUNE-UP PREPARATIONA6E4008020002011. Start the engine and warm up completely.
2. Verify that the gear is in neutral position.
3. Verify that the accelerator pedal is released.
4. Turn off the A/C switch.
5. Turn off all electrical loads.
6. Verify that no DTC is present.
7. Connect the WDS or equivalent to the DLC-2.
8. Wait until the electrical fan stops.
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IDLE SPEED INSPECTIONA6E4008020002021. Perform “Engine Tune-up Preparation”. (See F2–34 ENGINE TUNE-UP PREPARATION.)
2. Monitor the RPM PID using the WDS or equivalent.
3. Verify that engine speed is within specification.
•If not as specified, inspect the following.
—Suction control valve
—Fuel injector
—Accelerator position sensor
—ECT sensor
—Fuel pressure sensor
—CMP sensor
—CKP sensor
Specification
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CORRECTION PROCEDUREA6E400802000203
Note
•Perform each procedure by selecting the corresponding menu on the WDS screen. These procedures
appear when “Powertrain” in the “Toolbox tab” is selected.
Correction after Parts Installation
Note
•Perform this procedure after replacing the PCM and/or fuel injectors.
1. Perform “Engine Tune-up Preparation”. (See F2–34 ENGINE TUNE-UP PREPARATION.)
2. Perform “Correction after Parts Installation” using the WDS or equivalent.
ENGINE TUNE-UP
DLC-2
A6E40702001
Load condition Engine speed (rpm)
No load 725—825 (775±50)
A/C switch is on 725—825 (775±50)

FUEL SYSTEM
F2–45
F2
BEFORE REPAIR PROCEDUREA6E401201006203
Warning
•Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep
sparks and flames away from fuel.
•Fuel line spills and leads are dangerous. Fuel can ignite and cause serious injuries or death and
damage. Fuel can also irritate skin and eyes. To prevent this, always complete the following “Fuel
Line Safety Procedures”.
Fuel Line Safety Procedures
Note
•Fuel in the fuel system is under high pressure when the engine is not running.
1. Avoid fuel line spills and leaks by completing the following procedures.
(1) Remove the fuel-filler cap and release the pressure in the fuel tank.
(2) When disconnecting a fuel line hose, wrap a rag around it to protect against fuel leakage.
(3) Plug the hose after removal.
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AFTER REPAIR PROCEDUREA6E401201006204
Warning
•Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and
damage. When installing the fuel hose, observe “Fuel Hose Installation” described below.
Fuel Line Air Bleeding
Caution
•Continuously cranking the engine for over 30 s can damage the battery and the starter.
1. Continue cranking the engine for 30 s and stop for 5—10 s until the engine starts.
Fuel Hose Installation
1. Verify that there is no damage or deformation on the fuel hose and fuel pipe when installing.
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FUEL TANK REMOVAL/INSTALLATIONA6E401242110201
Warning
•Repairing a fuel tank that has not been properly steam cleaned can be dangerous. Explosion or
fire may cause death or serious injury. Always properly steam clean a fuel tank before repairing it.
•Fuel line spills and leakage are dangerous. Fuel can also irritate skin and eyes. To prevent this, do
not damage the sealing surface of the fuel gauge sender unit when removing or installing.
Caution
•Disconnecting/connecting the quick release connector without cleaning it may possibly cause
damage to the fuel pipe and quick release connector. Always clean the quick release connector
joint area before disconnecting/connecting using a cloth or soft brush, and make sure that it is
free of foreign material.
FUEL SYSTEM

FUEL SYSTEM
F2–49
F2
(2) Apply a slight amount of clean engine oil to
the sealing surface of the fuel pump unit.
(3) Align the fuel pipe on the fuel pump unit and
quick release connector so that the tabs of the
retainer are correctly fitted into the quick
release connector. Push the quick release
connector straight into the retainer until a click
is heard.
(4) Lightly pull and push the quick release
connector a few times by hand and verify that
it can move 2.0—3.0 mm {0.08—0.11 in} and
it is connected securely.
•If the quick release connector does not
move at all, verify that O-ring is not
damaged of that is has not slipped, and reconnect the quick release connector.
2. When the retainer is removed, perform the following procedure.
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FUEL TANK INSPECTIONA6E401242110202
Caution
•Disconnecting/connecting the quick release connector without cleaning it may possibly cause
damage to the fuel pipe and quick release connector. Always clean the quick release connector
joint area before disconnecting/connecting using a cloth or soft brush, and make sure that it is
free of foreign material.
Note
•This inspection is for two rollover valves and check valve (two-way) integrated in the fuel tank.
1. Remove the fuel tank with the fuel gauge sender unit. (See F2–45 FUEL TANK REMOVAL/INSTALLATION.)
2. Plug the fuel pipe of the fuel gauge sender unit.
3. Plug port C.
4. Connect the pump to port B.
5. Level the fuel tank.
6. Apply pressure of +2.0 kpa {+34 mmHg, +1.3
inHg} to port B.
(1) Verify there is airflow from port A.
•If there is no airflow, replace the fuel tank.
7. Apply pressure of –5.9 kPa {–44 mmHg, –1.7
inHg} to port B.
•If there is no vacuum, replace the fuel tank.
•If there is vacuum, turn the fuel tank
upside-down and proceed to next step.
8. Apply pressure of +2.0 kPa {+15 mmHg, +0.6
inHg} to port B.
(1) Verify there is no airflow from port A.
•If there is airflow, replace the fuel tank.
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OILOIL
PLASTIC FUEL HOSE QUICK RELEASE
CONNECTOR SEALING
SURFACE
A6E3912W006
B
C
APLUG
PLUG
CHECK VALVE
(TWO-WAY)
FUEL GAUGE SENDER UNIT
ROLLOVER VALVE
A6E40122034
B CA
PLUGPLUG
CHECK VALVE
(TWO-WAY)
FUEL GAUGE SENDER UNIT
ROLLOVER VALVE
A6E40122035

F2–54
FUEL SYSTEM
SUPPLY PUMP INSPECTIONA6E401213350202
Caution
•The supply pump is sealed to maintain proper function. Special tools and testers are required
when disassembling the supply pump. Disassembling the supply pump without special tools and
testers will cause a malfunction.
•Consult an authorized DENSO parts distributor for repair if any of the following supply pump parts
are possibly malfunctioning.
1. Supply pump inner parts
2. Suction control valve
3. Fuel temperature sensor
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SUCTION CONTROL VALVE INSPECTIONA6E401213350203
Caution
•The supply pump is sealed to maintain proper function. Special tools and testers are required
when disassembling the supply pump. Disassembling the supply pump without special tools and
testers will cause a malfunction.
•Consult an authorized DENSO parts distributor for repair if suction control valve is possibly
malfunctioning.
Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the suction control valve connector.
3. Measure the resistance between the suction
control valve terminals using an ohmmeter.
•If not as specified, repair the supply pump.
(See F2–54 SUPPLY PUMP INSPECTION.)
•If as specified, carry out the “Circuit Open/
Short Inspection”.
Specification
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See F2–64 PCM REMOVAL/INSTALLATION.)
2. Inspect the following wiring harnesses for an open or short circuit (continuity check).
Open circuit
•If there is no continuity, the circuit is open. Repair of replace the harness.
—Suction control valve terminal A (harness-side) and PCM terminal 93
—Suction control valve terminal B (harness-side) and PCM terminal 94
Short circuit
•If there is continuity, the circuit is shorted. Repair or replace the harness.
—Suction control valve terminal A (harness-side) and power supply
—Suction control valve terminal A (harness-side) and GND
—Suction control valve terminal B (harness-side) and power supply
—Suction control valve terminal B (harness-side) and GND
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COMMON RAIL INSPECTIONA6E401213015201
Caution
•Do not remove the fuel pressure sensor nor the fuel pressure limiter from the common rail. Since
fuel pressure in the common rail is extremely high, the fuel pressure sensor, fuel pressure limiter,
or the common rail can be damaged, leading to fuel leakage if any of them are removed.
1. Visually inspect the common rail for damage and cracks. Also verify that there is no extreme rust which will
cause fuel leakage.
•If either is observed, replace the common rail.
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Ambient temperature (°C {°F}) Resistance (ohms)
20 {68} Approx. 2.1
SUCTION
CONTROL VALVE A B
A6E40122018

CONTROL SYSTEM
F2–79
F2
FUEL PRESSURE SENSOR INSPECTIONA6E404013015201
Note
•Perform the following test only when directed.
Voltage Inspection
1. Start the engine and warm up the engine completely.
2. Measure the voltage between fuel pressure sensor terminals A and B using a voltmeter at idle.
•If not as specified, perform the “Circuit Open/Short Inspection”.
—If there is no open/short circuit, replace the common rail.
Specification
1.4—1.7 V
3. Turn off the engine and wait three minutes.
4. Turn the engine switch to ON.
5. Measure the voltage between fuel pressure
sensor terminals A and B using a voltmeter.
•If not as specified, perform the “Circuit Open/
Short Inspection”.
—If there is no open/short circuit, replace
the common rail.
Specification
0.9—1.1 V
CIrcuit Open/Short Inspection
1. Inspect for open/short circuit in the following
wiring harnesses.
•If there is open/short circuit, repair or replace wiring harnesses.
Open circuit
•Power circuit
—Fuel pressure sensor terminal C and PCM terminal 90
•Signal circuit
—Fuel pressure sensor terminal B and PCM terminal 61
•GND circuit
—Fuel pressure sensor terminal A and PCM terminal 91
Short circuit
•Power circuit
—Fuel pressure sensor terminal C and PCM terminal 90 to GND
•Signal circuit
—Fuel pressure sensor terminal B and PCM terminal 61 to power circuit
—Fuel pressure sensor terminal B and PCM terminal 61 to GND
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FUEL PRESSURE SENSOR
HARNESS SIDE CONNECTOR
A
B C
A6E40702049