Mazda 6. Manual — part 176
F–226
TROUBLESHOOTING
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6
Carry out fuel line pressure inspection.
Is fuel line pressure correct?
Yes
Inspect fuel injector for following:
• Open or short in injector
• Leakage
• Injection volume
No
Zero or low:
Inspect fuel pump circuit.
Inspect for fuel pump relief valve open.
Inspect for fuel leakage inside pressure regulator.
Inspect for clogged main fuel line.
High:
Inspect pressure regulator for high pressure cause.
Inspect for clogged fuel return line.
7
Inspect spark plug for following.
• Heat range
• Air gap
Is spark plug okay?
Yes
Go to next step.
No
Replace spark plug.
8
Remove suspected fuel injector.
Inspect following:
• Resistance
• Fuel injection volume
Are all above items okay?
Yes
Inspect for open circuit between suspected fuel injector
connector terminal and PCM connector following
terminals:
• For #1 or #4 cylinder: 1A
• For #2 or #3 cylinder: 1B
No
Replace fuel injector.
9
Is air cleaner element free of restrictions?
Yes
Go to next step.
No
Replace air cleaner element.
10
Carry out spark test.
Is strong blue spark visible at each cylinder?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
11
Carry out fuel line pressure inspection.
Is fuel line pressure correct?
(See
Yes
Go to next step.
No
Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
12
Inspect following PIDs.
• ECT
• O2S11 (When engine can be started)
• MAF
.)
Are PIDs okay?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
13
Carry out purge control inspection.
(When engine can be started)
(See
F–233 Purge Control System Inspection
.)
Is purge control correct?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
14
Carry out compression inspection.
Is compression correct?
Yes
Inspect for clogging in exhaust system.
No
Repair or replace malfunctioning parts.
15
When engine cannot be started, inspect intake-
air system for air leakage.
When engine can be started, carry out intake
manifold vacuum inspection.
Is air sucked in from intake-air system?
Yes
Repair or replace malfunctioning part.
No
Go to next step.
16
Carry out fuel line pressure inspection.
Is fuel line pressure correct?
(See
Yes
Inspect following PIDs.
• ECT
• O2S11
• MAF
(See
Inspect PCM GND condition.
No
Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
17
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace or reprogram PCM.
STEP
INSPECTION
RESULTS
ACTION
TROUBLESHOOTING
F–227
F
INTERMITTENT CONCERN TROUBLESHOOTING
A6E398018881W31
Vibration Method
1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the
steps below.
Note
• There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the
things to check for are:
— Connectors not fully seated.
— Wire harnesses not having full play.
— Wires laying across brackets or moving parts.
— Wires routed too close to hot parts.
• An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched
between parts.
• The connector joints, points of vibration, and places where wire harnesses pass through the fire wall, body
panels, etc. are the major areas to be checked.
Inspection Method for Switch Connectors or Wires
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON position (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Turn switch on manually.
5. Shake each connector or wire harness a bit
vertically and horizontally while monitoring the
PID.
• If PID value is unstable, check for poor
connection.
Inspection Method for Sensor Connectors or Wires
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition switch to ON position (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Shake each connector or wire harness a bit
vertically and horizontally while monitoring the
PID.
• If PID value is unstable, check for poor
connection.
Y3U103WN3
Y3U103WN4
F–228
TROUBLESHOOTING
Inspection Method for Sensors
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition switch to ON position (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.
• If PID value is unstable or malfunction occurs, check for poor connection and/or poorly mounted sensor.
Inspection Method for Actuators or Relays
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition switch to ON position (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Prepare the Output State Control for actuators or relays that you are inspecting.
4. Vibrate the actuator or relay with your finger for 3 seconds are Output State Control is activated.
• If variable click sound is heard, check for poor connection and/or poorly mounted actuator or relay.
Note
• Vibrating relays too strongly may result in
open relays.
Water Sprinkling Method
Caution
• Indirectly change the temperature and humidity by spraying water onto the front of the radiator.
• If a vehicle is subject to water leakage, the leakage may damage the control module. When testing
a vehicle with a water leakage problem, special caution must be used.
If malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps.
1. Connect WDS or equivalent to DLC-2 if you are inspecting sensors or switches.
2. Turn ignition switch to ON position (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for sensor or switch if you are inspecting sensors or switches.
4. If you are inspecting the switch, turn it on manually.
5. Spray water onto the vehicle or run it through a
car wash.
• If PID value is unstable or malfunction occurs,
repair or replace part as necessary.
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Y3U103WN5
YMU103WC3
TROUBLESHOOTING
F–229
F
ENGINE CONTROL SYSTEM OPERATION INSPECTION
A6E398018881W32
Main Relay Operation Inspection
1. Verify that the main relay clicks when the ignition switch is turned to ON position and off.
• If there is no operation sound, inspect the following.
— Harness and connector between ignition switch and main relay terminal A.
— Harness and connector between PCM terminal 2X and main relay terminal E.
Intake Manifold Vacuum Inspection
1. Verify air intake hoses are installed properly.
2. Start the engine and run it at idle.
3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake manifold
side.
4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.
• If not as specified, inspect the following.
Specification
More than 60 kPa {450 mmHg, 18 inHg}
Note
• Air suction can be located by engine speed change when lubricant is sprayed on the area where suction is
occurring.
— Air suction at throttle body, intake manifold and PCV valve installation points
— Accelerator cable free play
— Fuel injector insulator
— Engine compression
(See
Idle Air Control System Inspection
Engine coolant temperature compensation inspection
1. Connect WDS or equivalent to the DLC-2.
2. Select the following PIDs.
• ECT
• IAT
• RPM
3. Verify that the engine is in cold condition, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
• If the engine speed does not decrease or decreases slowly, inspect the following.
— ECT sensor and related harness
(See
F–53 ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION
— IAC valve and related harness
(See
F–13 IDLE AIR CONTROL (IAC) VALVE INSPECTION
.)
Load compensation inspection
1. Start the engine and run is at idle.
2. Connect WDS or equivalent to the DLC-2.
3. Verify that P0506, P0507 or P0511 not displayed.
• If P0506, P0507 or P0511 shown, carry out DTC inspection.
(See
4. Change the duty value of the IAC valve to 100% using the IAC PID.
5. Verify that the idle speed increases.
• If the idle speed does not change, inspect the following.
— IAC valve air passage
— Open or short circuit between IAC valve connector terminals and PCM connector terminals 4G and 4J
6. Select the following PIDs.
• ACSW
• IAC
• PSP
• RPM
Note
• Excludes temporary idle speed drop just after the loads are turned on.
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