Mazda 6. Manual — part 148
F–114
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0140
A6E397001084W26
7
VERIFY TROUBLESHOOTING OF DTC P0138
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from memory using WDS or
equivalent.
• Run PCM adaptive memory procedure drive
mode and HO2S heater, HO2S, and TWC
repair verification drive mode.
(See
• Is PENDING CODE the same as DTC
present?
Yes Replace PCM, then go to next step.
(See
No
Go to next step.
8
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 P0140
Rear HO2S circuit no activity detected
DETECTION
CONDITION
• PCM monitors input voltage from rear HO2S when the following conditions are met. If input voltage from
sensor never exceed 0.55 V for 30.4 s, PCM determines that sensor circuit is not activated.
MONITORING CONDITIONS
— HO2S, HO2S heater and TWC repair verification drive mode
— Following conditions are met:
• Engine speed is above 1,500 rpm.
• Engine coolant temperature is above 80 °C {158 °F}.
Diagnostic support note
• This is a continuous monitor (CCM).
• 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
• Rear HO2S deterioration
• Rear HO2S heater malfunction
• Leakage exhaust system
• Open or short to ground circuit between rear HO2S terminal A and PCM terminal 1Y
• Insufficient compression
• Engine malfunction
ON-BOARD DIAGNOSTIC
F–115
F
Diagnostic procedure
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
2
VERIFY RELATED PENDING AND STORED
DTCS
Note
• If fuel monitor DTC, DTC P0131or P0132 is
retrieved, ignore it until P0140 is fixed.
• Turn ignition key to OFF, then ON (Engine
OFF).
• Verify pending and stored DTCs using WDS or
equivalent.
• Is other DTC present?
Yes Go to appropriate DTC troubleshooting procedures.
(See
No
Go to next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0140 on FREEZE FRAME DATA?
Yes Go to next step.
No
Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
(See
4
VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up engine.
• Access O2S12 for P0140 or O2S22 for P0160
PID using WDS or equivalent.
• Verify PID while racing engine at least 10
times (in NEUTRAL (MTX) or PARK (ATX)).
• Is PID reading okay?
— More than 0.55 V at least once during
engine racing.
Yes Go to step 7.
No
Go to next step.
5
INSPECT INSTALLATION OF REAR HO2S
• Check if rear HO2S is loosely installed.
• Is sensor installed securely?
Yes Go to next step.
No
Install sensor securely, then go to Step 9.
DTC P0140
Rear HO2S circuit no activity detected
F–116
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0171
A6E397001084W27
6
INSPECT GAS LEAKAGE FROM EXHAUST
SYSTEM
• Visually check if any gas leakage is found
between exhaust pipe and rear HO2S.
• Is there any gas leakage?
Yes Repair or replace any faulty exhaust parts, then go to Step
9.
No
• Inspect the following harnesses for open or short to
ground circuit, repair or replace harness if necessary.
— Rear HO2S terminal A (harness-side) to PCM
terminal 1Y (harness-side)
• Repair or replace harness if necessary.
• If all items above are okay, replace faulty sensor.
Then go to Step 9.
7
INSPECT SEALING OF ENGINE COOLANT
PASSAGE
Warning
• Removing radiator cap when radiator is
hot is dangerous. Scalding coolant and
steam may shoot out and cause serious
injury.
• When removing radiator cap, wrap a
thick cloth around and turn it slowly.
• Remove radiator cap.
• Implement procedure to bleed air from engine
coolant, then run engine at idle.
• Is there any small bubble, which makes engine
coolant white at filling opening?
Note
• Large bubbles are normal since they are
remaining air coming out from engine
coolant passage.
Yes Air gets in from poor sealing on head gasket or other areas
between combustion chamber and engine coolant
passage.
Repair or replace faulty parts, then go to Step 9.
No
Go to next step.
8
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is it okay?
Yes Go to next step.
No
Implement engine overhaul for repairs, then go to next
step.
9
VERIFY TROUBLESHOOTING OF DTC P0140
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.
10
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 P0171
Fuel trim system too lean
DETECTION
CONDITION
• PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) values during closed loop
fuel control. If fuel trim exceeds preprogrammed criteria, PCM determines that fuel system is too lean.
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 conditions during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
ON-BOARD DIAGNOSTIC
F–117
F
Diagnostic procedure
POSSIBLE
CAUSE
• Misfire
• Front HO2S deterioration
• Front HO2S heater malfunction
• Pressure regulator malfunction
• Fuel pump malfunction
• Fuel filter clogged or restricted
• Fuel leakage on fuel line from fuel delivery pipe and fuel pump
• Fuel return hose clogged
• Leakage exhaust system
• Purge solenoid valve malfunction
• Purge solenoid hoses improper connection
• Insufficient compression
• Variable valve timing control system improper operation (L3-VE)
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
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 If misfire DTC is present, go to step 7.
If other DTC is present, go to appropriate DTC
troubleshooting procedures.
(See
No
If drive ability concern is present, go to Step 7.
If not, go to next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0171 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
• 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 18.
No
Go to next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS
UNDER TROUBLE CONDITION
• Inspect same PIDs as Step 4 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 18.
No
Go to next step.
6
VERIFY CURRENT INPUT SIGNAL STATUS OF
FRONT HO2S
• Access O2S11 for P0171 PID using WDS or
equivalent.
• Check PID under following accelerator pedal
condition (in PARK (ATX) or NEUTRAL
(MTX)).
• Is PID reading okay?
— Above 0.55 V when accelerator pedal is
suddenly depressed (rich condition).
— Below 0.55 V just after release of
accelerator pedal (lean condition)
Yes Inspect for air suction at followings due to cracks, damages
and loosening parts:
• From air cleaner to throttle body
• From throttle body to dynamic chamber
• From dynamic chamber to intake manifold
• Vacuum hoses
Note
• Engine speed may change when rust penetrating
agent is sprayed on the air suction area.
Repair or replace any faulty part, then go to Step 18.
No
Visually inspect for any gas leakage between exhaust
manifold and front HO2S.
• If there is no leakage, replace FRONT HO2S.
Then go to Step 18.
DTC P0171
Fuel trim system too lean
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