Mazda 6. Manual — part 169
F–198
TROUBLESHOOTING
End Of Sie
NO.7 SLOW RETURN TO IDLE
A6E398018881W09
Diagnostic procedure
End Of Sie
26
Is air leakage felt or heard at intake-air system
components while racing engine to higher
speed?
Yes
Repair or replace.
No
Go to next step.
27
Inspect engine condition while tapping EGR
valve housing.
Is engine condition improved?
Yes
Replace EGR valve.
No
Go to next step.
28
Note
• The following test should be performed for
vehicles with variable valve timing control
system. Go to next step for vehicles
without variable valve timing control
system.
Inspect variable valve timing control system
operation.
(See
F–239 Variable Valve Timing Control
.)
Does variable valve timing control work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
29
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for causes.
30
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
7
SLOW RETURN TO IDLE
DESCRIPTION
Engine takes more time than normal to return to idle speed.
POSSIBLE CAUSE
• ECT sensor malfunction
• Thermostat is stuck open.
• Throttle body malfunction
• Air leakage from intake-air system
STEP
INSPECTION
RESULTS
ACTION
1
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
2
Remove thermostat and inspect operation.
(See
(See
Is thermostat okay?
Yes
ECT and thermostat are okay.
Go to next step.
No
Access ECT PID on WDS or equivalent.
Inspect for both ECT PID and temperature gauge on
instrument cluster readings.
If temperature gauge on instrument cluster indicates
normal range but ECT PID is not same as temperature
gauge reading, inspect ECT sensor.
If temperature gauge on instrument cluster indicates
cold range but ECT PID is normal, inspect temperature
gauge and heat gauge unit.
3
Is throttle body free of contaminations?
Yes
Inspect for air leakage from intake-air system
components while racing engine to higher speed.
No
Clean or replace throttle body.
4
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
TROUBLESHOOTING
F–199
F
NO.8 ENGINE RUNS ROUGH/ROLLING IDLE
A6E398018881W10
Diagnostic procedure
8
ENGINE RUNS ROUGH/ROLLING IDLE
DESCRIPTION
• Engine speed fluctuates between specified idle speed and lower speed and engine shakes
excessively.
• Idle speed is too slow and engine shakes excessively.
POSSIBLE CAUSE
• Air leakage from intake-air system parts
• A/C system operation is improper
• Spark leakage from high-tension leads
• Spark plug malfunction
• Purge solenoid valve malfunction
• IAC valve improper operation
• EGR valve malfunction
• Erratic or no signal from CMP sensor
• Low engine compression
• Improper valve timing
• Improper variable valve timing control system operation (L3-VE)
• Erratic signal from CKP sensor
• Poor fuel quality
• PCV valve malfunction
• Air cleaner restriction
• Restriction in exhaust system
• Disconnected electrical connectors
• Inadequate fuel pressure
• Fuel pump body mechanical malfunction
• Improper load signal input
• Fuel line restriction or clogging
• Improper fuel injection control operation
• Fuel leakage from fuel injector
• Fuel injector clogging
• Engine overheating
• Vacuum leakage
• Pressure regurator malfunction
Warning
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing the fuel system services:
• 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 leakage 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
“BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this
manual.
(See
.)
(See
Caution
• Disconnecting/connecting quick release connector without cleaning it may possibly cause
damage to fuel pipe and quick release connector. Always clean quick release connector
joint area before disconnecting/connecting, and make sure that it is free of foreign material.
STEP
INSPECTION
RESULTS
ACTION
1
Verify following:
• External fuel shut off or accessory (kill
switch, alarm etc.)
• Fuel quality (e.g. proper octane,
contamination, winter/summer blend)
• No air leakage from intake-air system
• Proper sealing of intake manifold and
components attached to intake manifold:
EGR valve, IAC valve
• Ignition wiring
• Electrical connections
• Fuses
• Smooth operation of throttle valve
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
F–200
TROUBLESHOOTING
2
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
3
Is engine overheating?
Yes
Go to symptom troubleshooting "No.17 Cooling system
concerns - Overheating".
No
Go to next step.
4
Note
• Following test is for engine running rough
idle with A/C on concerns. If other
symptoms exist, go to next step.
Connect pressure gauge to A/C low and high
pressure side lines.
Start engine and run it at idle.
Turn A/C switch on.
Measure low side and high side pressures.
Are pressures within specifications?
(See
.)
Yes
Go to next step.
No
If A/C is always on, go to symptom troubleshooting
"No.24 A/C is always on or A/C compressor runs
continuously".
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
5
Note
• Following test is for engine running rough
with P/S on. If other symptoms exist, go to
next step.
Start engine and run it at idle.
Access PSP PID.
Inspect if PSP PID is on while turning steering
wheel right to left.
Is PSP PID okay?
Yes
Inspect power steering pressure switch operation and
wiring harness between P/S pressure switch connector
and PCM connector terminal 1Z.
No
Go to next step.
6
Visually inspect CKP sensor and teeth of
crankshaft pulley.
Are CKP sensor and teeth of crankshaft pulley
okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
7
Measure gap between CKP sensor and teeth of
crankshaft pulley.
Specification
0.5—1.5 mm {0.020—0.075 in}
Is gap within specification?
Yes
Go to next step.
No
Adjust CKP sensor.
8
Inspect for cracks on high-tension leads.
Are there any cracks on high-tension leads?
Yes
Repair suspected high-tension leads.
No
Go to next step.
9
Inspect spark plug condition.
Is spark plug wet, covered with carbon or
grayish white?
Yes
Spark plug is wet or covered with carbon:
Inspect for fuel leakage from injector.
Spark plug is grayish white:
Inspect for clogged fuel injector.
No
Install spark plugs on original cylinders.
Go to next step.
10
Start engine and disconnect IAC valve
connector.
Does rpm drop or engine stall?
Yes
Go to next step.
No
Inspect IAC valve and wiring harness.
11
Install fuel pressure gauge between fuel pipe
and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
(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
Visually inspect for fuel leakage at fuel injector,
O-ring, and fuel line.
Service as necessary.
Does fuel line pressure hold after ignition switch
is turned off?
(See
Yes
Go to next step.
No
Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
STEP
INSPECTION
RESULTS
ACTION
TROUBLESHOOTING
F–201
F
End Of Sie
NO.9 FAST IDLE/RUNS ON
A6E398018881W11
Diagnostic procedure
13
Connect WDS or equivalent to DLC-2.
Start the engine and run it at idle.
Access O2S11 PID.
Is O2S11 PID okay?
• More than 0.45 V when accelerator pedal is
suddenly depressed: rich condition
• Less than 0.45 V during fuel cut: lean
condition
Yes
Go to next step.
No
Inspect and repair or replace faulty HO2S, harness,
connector or terminal, then go to next step.
14
Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid valve side.
Plug opening end of vacuum hose. Start engine.
Does engine condition improve?
Yes
Inspect if purge solenoid valve sticks open
mechanically.
Inspect EVAP control system.
No
Go to next step.
15
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
16
Inspect for restriction in exhaust system.
Is there any restriction?
Yes
Inspect exhaust system.
No
Go to next step.
17
Visually inspect CMP sensor and teeth of
camshaft.
Are CMP sensor and teeth of camshaft okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
18
Inspect engine condition while tapping EGR
valve housing.
Does engine condition improve?
Yes
Replace EGR valve.
No
Go to next step.
19
Note
• The following test should be performed for
vehicles with variable valve timing control
system. Go to next step for vehicles witout
variable valve timing control system.
Inspect variable valve timing control system
operation.
(See
F–239 Variable Valve Timing Control
Does variable valve timing control system work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
20
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for causes.
21
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
9
FAST IDLE/RUNS ON
DESCRIPTION
• Engine speed continues at fast idle after warm-up.
• Engine runs after ignition switch is turned off.
POSSIBLE CAUSE
• ECT sensor malfunction
• Air leakage from intake-air system
• Throttle body malfunction
• Accelerator cable free play misadjustment
• Cruise control cable misadjustment
• Improper load signal input
STEP
INSPECTION
RESULTS
ACTION
1
Connect WDS or equivalent to DLC-2.
Access ECT PID.
Start and warm up engine to normal operating
temperature.
Is ECT PID reading between 82—112
°C {180—
234
°F}?
Yes
Go to next step.
No
ECT PID is higher than 112
°C {234°F}:
Go to symptom troubleshooting "No.17 Cooling system
concerns - Overheating".
ECT PID is less than 82
°C {180°F}:
Go to symptom troubleshooting "No.18 Cooling system
concerns - Runs cold".
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