Mazda 6. Manual — part 172
F–210
TROUBLESHOOTING
NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE
A6E398018881W15
Diagnostic procedure
End Of Sie
13
KNOCKING/PINGING - ACCELERATION/CRUISE
DESCRIPTION
Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g., hot spot in
combustion chamber).
POSSIBLE CAUSE
• Engine overheating due to cooling system malfunction
• ECT sensor malfunction
• IAT sensor malfunction
• MAF sensor malfunction
• Knock sensor malfunction
• Erratic signal from CMP sensor
• Inadequate engine compression
• Inadequate fuel pressure
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the 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
Connect WDS or equivalent to DLC-2.
Access ECT PID.
Verify ECT PID is less than 116
°C {241°F}
during driving.
Is ECT PID less than specification?
Yes
Go to next step.
No
Inspect cooling system for cause of overheating.
2
Connect WDS or equivalent to DLC-2.
Access IAT, MAF and SPARKADV PIDs.
Monitor each PID.
(See
.)
Are PIDs okay?
Yes
Go to next step.
No
IAT PID: Inspect IAT sensor
MAF PID: Inspect MAF sensor
SPARKADV PID: Inspect CMP sensor and knock
sensor.
3
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
4
Is engine compression correct?
Yes
Go to next step.
No
Inspect for cause.
5
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
Inspect ignition timing.
No
Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
6
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
TROUBLESHOOTING
F–211
F
NO.14 POOR FUEL ECONOMY
A6E398018881W16
Diagnostic procedure
14
POOR FUEL ECONOMY
DESCRIPTION
Fuel economy is unsatisfactory.
POSSIBLE CAUSE
• Contaminated air cleaner element
• VIS malfunction (if equipped)
• Engine cooling system malfunction
• Improper ATF level (ATX)
• Weak spark
• Poor fuel quality
• Erratic or no signal from CMP sensor
• Clutch slippage (MTX)
• VTCS malfunction
• Improper variable valve timing control system operation (if equipped)
• Improper coolant level
• Inadequate fuel pressure
• Spark plug malfunction
• PCV valve malfunction
• Brake dragging
• Improper valve timing due to jumping out of timing belt
• Contaminated MAF sensor
• Improper engine compression
• Exhaust system clogging
Warning
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing 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
Inspect for following:
• Air cleaner element for contamination
• ATF level
• Fuel quality
• Coolant level
• Brake dragging
• Clutch slippage
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
2
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
3
Access ECT PID.
Drive vehicle while monitoring PID.
(See
Is PID within specification?
Yes
Go to next step.
No
Inspect for coolant leakage, cooling fan and condenser
fan operations or thermostat operation.
F–212
TROUBLESHOOTING
End Of Sie
4
Is strong blue spark visible at each disconnected
high-tension lead while cranking engine?
Yes
Inspect for following:
• Spark plugs malfunction
• CMP sensor is improperly installed.
• Trigger wheel damage on camshaft
• Open or short circuit on CMP sensor
• Open or short circuit between CMP sensor and
PCM terminal 2J or 2M
Repair or replace malfunctioning parts.
If okay, go to next step.
No
Inspect following:
• High-tension leads
• Ignition coil and connector
5
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.
6
Inspect for VTCS operation.
(See
F–231 Variable Tumble Control System
.)
Does VTCS work properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
7
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 for 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.
8
Note
• The following test should be performed for
vehicles with VIS. Go to next step for
vehicles without VIS.
Inspect for VIS operation.
(See
F–230 VIS Operation Inspection
Does VIS work properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
9
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
10
Inspect for restriction in the exhaust system.
Is there any restriction?
Yes
Inspect exhaust system.
No
Go to next step.
11
Inspect for contaminated MAF sensor.
Is there any contamination?
Yes
Go to next step.
No
Inspect for cause.
12
Inspect MAF sensor for contamination.
Is there any contamination?
Yes
Replace MAF sensor.
No
Go to next step.
13
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for cause.
14
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
TROUBLESHOOTING
F–213
F
NO.15 EMISSION COMPLIANCE
A6E398018881W17
Diagnostic procedure
15
EMISSION COMPLIANCE
DESCRIPTION
Fails emissions test.
POSSIBLE CAUSE
• Vacuum lines leakage or blockage
• Cooling system malfunction
• Spark plug malfunction
• Leakage from intake manifold
• Erratic or no signal from CMP sensor
• Inadequate fuel pressure
• PCV valve malfunction or incorrect valve installation
• EGR valve malfunction
• Exhaust system clogging
• Fuel tank ventilation system malfunction
• Charcoal canister damage
• Air cleaner element clogging or restriction
• Throttle body malfunction
• Spark leakage from high-tension leads
• Improper air/fuel mixture ratio control operation
• Catalyst converter malfunction
• Engine internal parts malfunction
• Excessive carbon is built up in combustion chamber
• Improper engine compression
• Improper valve timing
Warning
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing 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
Inspect for following:
• Vacuum lines for leakage or blockage
• Electrical connections
• Proper maintenance schedule followed
• Intake-air system and air cleaner element
concerns: obstructions, leakage or dirtiness
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
2
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
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 any other drivability concern present?
Yes
Go to appropriate symptom troubleshooting.
No
Go to next step.
4
Connect WDS or equivalent to DLC-2.
Access ECT PID.
Warm up engine and run it at idle.
Verify ECT PID is correct.
(See
Is ECT PID correct?
Yes
Go to next step.
No
Inspect for coolant leakage, cooling fan and condenser
fan operation or thermostat operation.
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