Mazda 6. Manual — part 149
F–118
ON-BOARD DIAGNOSTIC
7
INSPECT MAF PID
• Start engine.
• Access MAF PID using WDS or equivalent.
• Verify that MAF PID changes quickly according
to race engine RPM.
• Is MAF PID response okay?
Yes Go to next step.
No
Replace Mass air flow sensor, then go to Step 18.
8
INSPECT FOR EXCESSIVE AIR SUCTION OF
INTAKE AIR SYSTEM
• Visually inspect for loosen, cracks or damages
hoses on intake air system.
• Is there any malfunction?
Yes Repair or replace source of air suction, then go to Step 18.
No
Go to next step.
9
INSPECT FUEL LINE PRESSURE
• Turn ignition key to OFF.
Note
• If engine won’t start, inspect fuel line
pressure with ignition key ON.
• Inspect fuel line pressure while engine running.
• Is fuel line pressure okay?
Yes Go to step 11.
No
• If fuel line pressure is too high: Replace fuel pump unit,
then go to Step 18.
• If fuel line pressure is too low: Go to next step.
10
INSPECT FUEL LINE FROM FUEL PUMP TO
FUEL DELIVERY PIPE
• Visually inspect fuel line for any leakage.
• Is any fuel leakage found?
Yes Replace suspected fuel line, then go to Step 18.
No
Inspect fuel filters for follows:
• Restriction or clogging at fuel filter (high-pressure side).
• Foreign materials or stain inside fuel filter (low-pressure
side)
Perform following actions as result.
• If restriction or clogging is found at fuel filter (high-
pressure side), replace fuel pump unit.
• If foreign materials or stain is found inside fuel filter
(low-pressure side), clean of fuel tank and filter.
• If all items above are okay, replace fuel pump unit.
Then go to Step 18.
11
CHECK IGNITION COIL OPERATION AND
HIGH-TENSION LEAD WITH TIMING LIGHT
• Verify blinking condition on each cylinders
using timing light at idle.
• Do all cylinders show blinking condition?
Yes Go to Step 15.
No
Go to next step.
12
CHECK HIGH-TENSION LEADS OF NO
BLINKING CYLINDER
• Turn ignition key to OFF.
• Inspect high-tension leads for installation
condition, corrosion on terminal, open lead and
damaged cover.
• Is condition of high-tension lead okay?
Yes Go to next step.
No
Replace faulty high-tension lead, then go to Step 18.
13
INSPECT POWER SUPPLY TERMINAL AT
IGNITION COIL CONNECTOR
• Disconnect ignition coil connector.
• Turn ignition key to ON (Engine OFF).
• Check voltage at ignition coil connector
terminal B (harness-side) and body ground.
• Is voltage B+?
Yes Go to next step.
No
Check for open circuit between ignition coil connector and
ignition switch. Repair or replace wiring harness, then go to
Step 18.
14
INSPECT IGNITION COIL RESISTANCE
• Check ignition coil resistance.
• Is coil resistance okay?
Yes Go to next step.
No
Replace ignition coil, then go to Step 18.
15
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is it okay?
Yes Go to next step.
No
Implement engine overhaul for repairs, then go to Step 18.
STEP
INSPECTION
ACTION
ON-BOARD DIAGNOSTIC
F–119
F
End Of Sie
DTC P0172
A6E397001084W28
Diagnostic procedure
16
INSPECT VARIABLE VALVE TIMING CONTROL
SYSTEM OPERATION
Note
• The following test should be performed for
variable valve timing control system. Go to
next step for vehicles without variable valve
timing control system.
• Inspect variable valve timing control system
F–239 Variable Valve Timing Control
.)
• Does variable valve timing control system work
properly?
Yes Go to next step.
No
Repair or replace malfunctioning part according to variable
valve timing control system inspection results, then go to
Step 18.
17
INSPECT FUEL INJECTOR OPERATION
• Remove fuel injector.
• Inspect injector operation.
• Is fuel injector okay?
Yes Go to next step.
No
Replace injector, then go to next step.
18
VERIFY TROUBLESHOOTING OF DTC P0171
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOER self-test.
.)
• Is same DTC present?
Yes Replace PCM, then go to next step.
(See
No
Go to next step.
19
VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
DTC P0172
Fuel trim system too rich
DETECTION
CONDITION
• PCM monitors short fuel trim (SHRTFT) and long fuel trim (LONGFT) values during closed loop fuel
control. If fuel trim exceeds preprogrammed criteria, PCM determines that fuel system is too rich.
Diagnostic support note
• This is a continuous monitor. (FUEL SYSTEM)
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one
drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• Misfire
• Front HO2S deterioration
• Front HO2S heater malfunction
• Pressure regulator malfunction
• Fuel pump malfunction
• Fuel return hose clogged
• Purge solenoid valve malfunction
• Purge solenoid hoses improper connection
• PCV valve malfunction
STEP
INSPECTION
ACTION
1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
.)
• Is same DTC present?
Yes Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See
F–120
ON-BOARD DIAGNOSTIC
End Of Sie
2
VERIFY RELATED PENDING CODE OR
STORED DTCS
• Turn ignition key to OFF, then ON (Engine
OFF).
• Verify related pending code or stored DTCs.
• Is other DTCs present?
Yes Go to appropriate DTC troubleshooting procedures.
No
If drive ability concern is present, go to Step 8.
If not, go to next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0172 on FREEZE FRAME DATA?
Yes Go to next step.
No
Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
4
VERIFY CURRENT INPUT SIGNAL STATUS
(IGNITION KEY TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs using
WDS or equivalent.
• Is there any signal that is far out of
specification when ignition key is ON and
engine runs?
Yes Inspect suspected sensor and excessive resistance in
related wiring harnesses. Repair or replace if necessary.
Then go to Step 10.
No
Go to next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS
UNDER TROUBLE CONDITION
• Inspect PID data while simulating FREEZE
FRAME DATA condition.
• Is there any input signal which causes drastic
changes?
Yes Inspect suspected sensor and related wiring harnesses,
and repair or replace it. Then go to Step 10.
No
Go to next step.
6
VERIFY CURRENT INPUT SIGNAL STATUS OF
FRONT HO2S
• Access O2S11 PID using WDS or equivalent.
• Verify PID while racing engine (in PARK (ATX)
or NEUTRAL (MTX)).
• Is PID reading okay?
— Above 0.55 V when accelerator pedal is
suddenly depress (rich condition).
— Below 0.55 V just after release of
accelerator pedal (lean condition)
Yes Go to next step.
No
Replace suspected front HO2S.
Then go to Step 10.
7
INSPECT FUEL LINE PRESSURE
• Turn ignition key to OFF.
• Inspect fuel line pressure while engine running.
• Is fuel line pressure okay?
Yes Go to next step.
No
Replace fuel pump unit, then go to Step 10.
8
INSPECT PURGE SOLENOID VALVE FOR
STUCK OPEN
• Turn ignition key to OFF.
• Disconnect both hoses from purge solenoid
valve.
• Blow air through purge solenoid valve.
• Does air blow through?
Yes Replace purge solenoid valve.
Then go to Step 10.
No
Go to next step.
9
INSPECT PCV VALVE OPERATION
• Inspect PCV valve operation.
• Is PCV valve okay?
Yes Go to next step.
No
Replace PCV valve, then go to next step.
10
VERIFY TROUBLESHOOTING OF DTC P0172
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from memory using WDS or
equivalent.
• Perform KOER self-test.
.)
• Is same DTC present?
Yes Replace PCM, then go to next step.
(See
No
Go to next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See
.)
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
ON-BOARD DIAGNOSTIC
F–121
F
DTC P0300
A6E397001085W01
Diagnostic procedure
DTC P0300
Random misfire detection
DETECTION
CONDITION
• PCM monitors CKP sensor input signal interval time. PCM calculates change of interval time for each
cylinder. If change of interval time exceeds preprogrammed criteria, PCM detects misfire in the
corresponding cylinder. While the engine is running, the PCM counts number of misfires that occurred at
200 crankshaft revolutions and 1,000 crankshaft revolutions and calculates misfire ratio for each
crankshaft revolution. If the ratio exceeds the preprogrammed criteria, PCM determines that a misfire,
which can damage catalytic converter or affect emission performance, has occurred.
Diagnostic support note
• This is a continuous monitor (MISFIRE).
• MIL illuminates if PCM detects the misfire which affects emission performance in two consecutive drive
cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• MIL flashes if PCM detects the misfire which can damage the catalytic converter during first drive cycle.
Therefore, PENDING CODE is not available while MIL flashes.
• PENDING CODE is available if PCM detects the misfire which affects emission performance during first
drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• CKP sensor malfunction
• CMP sensor malfunction
• Ignition coil malfunction
• High-tension lead malfunction
• MAF sensor contamination
• Excess air suction in intake air system (between MAF sensor and intake manifold)
• Fuel pump malfunction
• Fuel pressure regulator malfunction
• Fuel line clogged
• Fuel filter clogged
• Fuel leakage in fuel line
• Fuel runout
• Poor quality fuel
• Purge control solenoid valve malfunction
• PCV valve malfunction
• EGR valve malfunction
• Vacuum hoses damages or improper connection
• Related connector and terminal malfunction
• Related wiring harness malfunction
• Insufficient compression
• Variable valve timing control system improper (L3-VE)
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to
next step.
2
VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
VERIFY RELATED PENDING CODE OR
STORED DTCs
• Turn ignition key to OFF then ON (Engine
OFF).
• Verify related pending code or stored DTCs.
• Are other DTCs present?
Yes Go to appropriate DTC troubleshooting.
(See
No
Go to next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS
(IGNITION KEY TO ON/IDLE)
• Access BOO, ECT, IAT, MAF, RPM, TP, and
VSS PIDs using WDS or equivalent.
(See
• Is there any signal that is far out of
specification when ignition switch is ON and
engine runs at idle?
Yes Inspect suspected circuit and/or part according to
inspection results.
(See
Then go to Step 22.
No
Go to next step.
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