Mazda 6. Manual — part 145
F–102
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0123
A6E397001084W20
5
VERIFY TP SIGNAL CIRCUIT FOR OPEN
CIRCUIT
• Turn ignition key to OFF.
• Inspect continuity between TP sensor terminal
B (harness-side) and PCM terminal 2A.
• Is there continuity?
Yes Go to next step.
No
Repair or replace suspected harness, then go to Step 7.
6
VERIFY TP SIGNAL CIRCUIT FOR SHORT TO
GROUND
• Inspect continuity between TP sensor terminal
B (harness-side) and body ground.
• Is there continuity?
Yes Repair or replace suspected harness, then go to Step 7.
No
Go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0122
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOEO/KOER self-test.
.)
• Is same 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 P0123
TP circuit high input
DETECTION
CONDITION
• If PCM detects TP sensor voltage at PCM terminal 2A is above 4.9 V after ignition key to on, the PCM
determines that TP circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition in first drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal A and PCM terminal 2H
• Short to constant voltage supply circuit between TP sensor terminal B and PCM terminal 2A
ON-BOARD DIAGNOSTIC
F–103
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
INSPECT TP SENSOR CONNECTOR
• Turn ignition key to OFF.
• Verify that the TP sensor connector is
connected securely.
• Is connector okay?
Yes Go to next step.
No
Connect the connector securely, then go to Step 9.
3
INSPECT POOR CONNECTION OF TP SENSOR
CONNECTOR
• Disconnect TP sensor connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
Yes Repair or replace suspected terminal, then go to Step 9.
No
Go to next step.
4
INSPECT TP SENSOR
• Perform TP sensor inspection.
)
• Is TP sensor okay?
Yes Go to next step.
No
Replace TP sensor, then go to Step 9.
5
INSPECT TP SENSOR SIGNAL CIRCUIT FOR
SHORT TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between terminal B and body
ground.
• Is voltage above 4.9?
Yes Repair or replace short to power circuit. Then, go to Step 9.
No
Go to next step.
6
VERIFY TP SENSOR GROUND CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between TP sensor
connector terminal A and body ground.
• Is there continuity?
Yes Repair or replace open circuit between TP sensor
connector terminal A (harness-side) and PCM connector
terminal 2H (harness-side). Then, go to Step 9.
No
Go to next step.
DTC P0123
TP circuit high input
F–104
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0125
A6E397001084W21
Diagnostic procedure
7
INSPECT PCM CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
Yes Repair terminal, then go to Step 9.
No
Go to Step 9.
8
VERIFY TP SIGNAL CIRCUIT FOR SHORT TO
CONSTANT VOLTAGE CIRCUIT
• Inspect continuity between TP sensor
connector terminals B and C.
• Is there continuity?
Yes Repair or replace suspected harness, then go to next step.
No
Go to next step.
9
VERIFY TROUBLESHOOTING OF DTC P0123
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOEO/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 P0125
Excessive time to enter closed loop fuel control
DETECTION
CONDITION
• PCM monitors ECT sensor signal at PCM terminal 1M after engine is started while engine is cold. If engine
coolant temperature does not reach the expected temperature for specified period, PCM determines that it
has taken an excessive amount of time for the engine coolant temperature to reach the temperature
necessary to start closed-loop fuel control.
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 PCM memory.
POSSIBLE
CAUSE
• ECT sensor malfunction
• Poor connection of connectors
• PCM malfunction
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 CURRENT INPUT SIGNAL STATUS-IS
CONCERN INTERMITTENT OR CONSTANT
• Start engine.
• Warm up engine completely.
• Access ECT PID using WDS or equivalent.
• Is ECT PID above 60 °C {140 °F}?
Yes Intermittent concern exists. Go to INTERMITTENT
CONCERNS TROUBLESHOOTING procedure.
(See
No
Go to next step.
4
INSPECT POOR CONNECTION OF ECT
SENSOR CONNECTOR
• Turn ignition key to OFF.
• Disconnect ECT sensor connector.
• Inspect for poor connection (damaged, pulled-
out pins, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminal, then go to Step 7.
No
Go to next step.
ON-BOARD DIAGNOSTIC
F–105
F
End Of Sie
DTC P0131, P0132
A6E397001084W22
Diagnostic procedure
5
INSPECT ECT SENSOR
• Inspect ECT sensor.
TEMPERATURE (ECT) SENSOR
INSPECTION
• Is it okay?
Yes Go to next step.
No
Replace ECT sensor, then go to Step 7.
6
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out pins, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminal, then go to next step.
No
Go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0125
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Turn ignition key to ON (Engine OFF).
• Access ECT PID using WDS or equivalent.
• Wait until ECT PID below 20 °C {68 °F}.
• Start engine and warm it up completely.
• Is PENDING CODE the same as DTC stored?
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 P0131
DTC P0132
Front HO2S stuck low
Front HO2S stuck high
DETECTION
CONDITION
• PCM monitors input voltage from front HO2S when the following monitoring conditions are met. If input
voltage from sensor remains below or above 0.45 V for 41.2 s, PCM determines that there is no front
HO2S inversion.
MONITORING CONDITIONS
— Engine speed is above 1,500 rpm.
— Engine coolant temperature is above 80
°C {176°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
• Front HO2S malfunction
• Front HO2S heater malfunction
• Fuel injector malfunction
• Pressure regulator malfunction
• Fuel pump malfunction
• Fuel delivery hose clogging or leakage
• Fuel filter clogging
• Fuel return hose clogging or leakage
• Air suction or leakage
• PCV valve malfunction
• Purge solenoid valve malfunction
• Purge solenoid hoses are hooked up incorrectly.
• Ignition coil malfunction
• Insufficient compression
• Engine malfunction
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.
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