2002 MAZDA 6 sensor

F2–124
ON-BOARD DIAGNOSTIC
DTC P0191A6E407001082221
Diagnostic procedure
End Of Sie
DTC P0191 Fuel pressure sensor circuit performance problem
DETECTION
CONDITION•PCM monitors fuel pressure in common rail from fuel pressure sensor while engine is running. PCM
calculates difference between actual fuel pressure and target fuel pressure. If pressure difference exceeds
preprogrammed criteria, PCM determines fuel pressure sensor circuit performance problem.
POSSIBLE
CAUSE•Fuel pressure sensor malfunction
•Suction control valve malfunction
•Clogged fuel line
•PCM malfunction
STEP INSPECTION ACTION
1VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Information
availability.
•Is any related repair 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.
2FOLLOW OTHER DETECTED DTC FIRST
•Turn engine switch to OFF.
•Start engine.
•Have P0091, P0092, P0192, P0193 been
detected?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Go to next step.
3INSPECT FUEL PRESSURE SENSOR
•Inspect fuel pressure sensor.
(See F2–79 FUEL PRESSURE SENSOR
INSPECTION)
•Is there any malfunction?Yes Replace common rail, go to Step 6.
(See F2–53 SUPPLY PUMP REMOVAL/INSTALLATION)
No Go to next step.
4INSPECT SUCTION CONTROL VALVE
•Inspect suction control valve.
(See F2–54 SUCTION CONTROL VALVE
INSPECTION)
•Is there any malfunction?Yes Repair supply pump, go to Step 6.
(See F2–54 SUPPLY PUMP INSPECTION)
No Go to next step.
5INSPECT FUEL LINE
•Turn engine switch to OFF.
•Inspect for clogs in following fuel lines for each
cylinder:
—Common rail and fuel injector.
—Common rail and fuel tank.
• Is there any malfunction?Yes Repair or replace suspected fuel line, go to next step.
No Go to next step.
6VERIFY TROUBLESHOOTING OF DTC P0016
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from PCM memory using WDS or
equivalent.
•Start engine.
•Is same DTC present?Yes Replace PCM, go to next step.
(See F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
7VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
•Is there any DTC present?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed.

ON-BOARD DIAGNOSTIC
F2–125
F2
DTC P0192A6E407001082222
Diagnostic procedure
DTC P0192 Fuel pressure sensor circuit low input
DETECTION
CONDITION•PCM monitors input voltage from fuel pressure sensor while engine is running. If input voltage from fuel
pressure sensor is below 0.4 V, PCM determines fuel pressure sensor circuit low input.
POSSIBLE
CAUSE•Fuel pressure sensor malfunction
•Connector or terminal malfunction
•Short to GND in wiring between fuel pressure sensor terminal C and PCM terminal 90
•Open circuit in wiring between fuel pressure sensor terminal C and PCM terminal 90
•Short to GND in wiring between fuel pressure sensor terminal B and PCM terminal 61
•Fuel pressure sensor signal and GND circuits short each other
•PCM malfunction
STEP INSPECTION ACTION
1VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Information
availability.
•Is any related repair 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.
2INSPECT POOR CONNECTION OF FUEL
PRESSURE SENSOR CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to Step 9.
No Go to next step.
3INSPECT FUEL PRESSURE SENSOR SIGNAL
CIRCUIT FOR SHORT TO GND
•Turn engine switch to OFF.
•Inspect continuity between fuel pressure
sensor terminal C and body GND.
•Is there continuity?Yes Repair or replace harness for short to GND, go to Step 9.
No Go to next step.
4INSPECT FUEL PRESSURE SENSOR POWER
CIRCUIT FOR OPEN
•Turn engine switch to ON. (Engine OFF)
•Inspect voltage at fuel pressure sensor
terminal C (harness side).
•Is voltage below 1.0 V?Yes Repair or replace harness for open, go to Step 9.
No Go to next step.
2
8
7
2
8
6
8
5
43
6
2
CBAC
B
A90
61
91PCM FUEL PRESSURE SENSOR
91 9061 FUEL PRESSURE SENSOR
HARNESS SIDE CONNECTORPCM
HARNESS SIDE CONNECTOR

F2–126
ON-BOARD DIAGNOSTIC
End Of Sie
5INSPECT FUEL PRESSURE SENSOR SIGNAL
CIRCUIT FOR SHORT TO GND
•Turn engine switch to OFF.
•Inspect continuity between fuel pressure
sensor terminal B and body GND.
•Is there continuity?Yes Repair or replace harness for short to GND, go to Step 9.
No Go to next step.
6INSPECT FUEL PRESSURE SENSOR CIRCUIT
FOR SHORT WITH EACH OTHER
•Turn engine switch to OFF.
•Inspect continuity between fuel pressure
sensor terminals B and A.
•Is there continuity?Yes Repair or replace harness for short with each other, go to
Step 9.
No Go to next step.
7INSPECT FUEL TEMPERATURE SENSOR
•Inspect fuel temperature sensor.
(See F2–79 FUEL PRESSURE SENSOR
INSPECTION)
•Is there any malfunction?Yes Repair supply pump, go to Step 9.
(See F2–54 SUPPLY PUMP INSPECTION)
No Go to next step.
8INSPECT POOR CONNECTION OF PCM
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to next step.
No Go to next step.
9VERIFY TROUBLESHOOTING OF DTC P0192
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from PCM memory using WDS or
equivalent.
•Start engine.
•Is same DTC present?Yes Replace PCM, go to next step.
(See F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
10VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
•Is there any DTC present?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC
F2–127
F2
DTC P0193A6E407001082223
Diagnostic procedure
DTC P0193 Fuel pressure sensor circuit high input
DETECTION
CONDITION•PCM monitors input voltage from fuel pressure sensor while engine is running. If input voltage from fuel
pressure sensor is above 4.8 V, PCM determines fuel pressure sensor circuit high input.
POSSIBLE
CAUSE•Fuel pressure sensor malfunction
•Connector or terminal malfunction
•Fuel pressure sensor power and signal circuits short each other
•Open circuit in wiring between fuel pressure sensor terminal B and PCM terminal 61
•Open circuit in wiring between fuel pressure sensor terminal A and PCM terminal 91
•PCM malfunction
STEP INSPECTION ACTION
1VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Information
availability.
•Is any related repair 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.
2INSPECT POOR CONNECTION OF FUEL
PRESSURE SENSOR CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to Step 7.
No Go to next step.
3INSPECT FUEL PRESSURE SENSOR CIRCUIT
FOR SHORT WITH EACH OTHER
•Turn engine switch to OFF.
•Inspect continuity between fuel pressure
sensor terminals C and B
•Is there continuity?Yes Repair or replace harness for short with each other, go to
Step 7.
No Go to next step.
4INSPECT FUEL TEMPERATURE SENSOR
•Inspect fuel temperature sensor.
(See F2–77 FUEL TEMPERATURE SENSOR
INSPECTION)
•Is there any malfunction?Yes Repair supply pump, go to Step 7.
(See F2–54 SUPPLY PUMP INSPECTION)
No Go to next step.
53
6
2
5
4
3
6
2
25
FUEL PRESSURE SENSOR
C
B
A90
61
91PCM
CBA
919061 FUEL PRESSURE SENSOR
HARNESS SIDE CONNECTORPCM
HARNESS SIDE CONNECTOR

F2–128
ON-BOARD DIAGNOSTIC
End Of Sie
5INSPECT POOR CONNECTION OF PCM
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to Step 7.
No Go to next step.
6INSPECT FUEL PRESSURE SENSOR CIRCUIT
FOR OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—Fuel pressure sensor terminal B and PCM
terminal 61.
—Fuel pressure sensor terminal A and PCM
terminal 91.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to next step.
7VERIFY TROUBLESHOOTING OF DTC P0193
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from PCM memory using WDS or
equivalent.
•Start engine.
•Is same DTC present?Yes Replace PCM, go to next step.
(See F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
8VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
•Is there any DTC present?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC
F2–131
F2
DTC P0221A6E407001082225
Diagnostic procedure
End Of Sie
DTC P0221 Accelerator position sensor No.2 circuit performance problem
DETECTION
CONDITION•PCM monitors input voltage from accelerator position sensor No.1 and accelerator position sensor No.2
while engine is running. If voltage difference exceeds 0.9 V, PCM determines accelerator position sensor
No.2 circuit performance problem.
POSSIBLE
CAUSE•Accelerator position sensor malfunction
•Connector or terminal malfunction
•Accelerator position sensor misadjustment
•PCM malfunction
STEP INSPECTION ACTION
1VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Information
availability.
•Is any related repair 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.
2INSPECT POOR CONNECTION OF
ACCELERATOR POSITION SENSOR
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to Step 5.
No Go to next step.
3INSPECT ACCELERATOR POSITION SENSOR
•Turn engine switch to OFF.
•Inspect accelerator position sensor.
(See F2–72 ACCELERATOR POSITION
SENSOR INSPECTION)
•Is there any malfunction?Yes Adjust or replace accelerator position sensor, go to Step 5.
(See F2–73 ACCELERATOR POSITION SENSOR
ADJUSTMENT)
(See F2–44 ACCELERATOR PEDAL COMPONENT
DISASSEMBLY/ASSEMBLY)
No Go to next step.
4INSPECT POOR CONNECTION OF PCM
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to next step.
No Go to next step.
5VERIFY TROUBLESHOOTING OF DTC P0221
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from PCM memory using WDS or
equivalent.
•Start engine.
•Is same DTC present?Yes Replace PCM, go to next step.
(See F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
6VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
•Is there any DTC present?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed.

F2–132
ON-BOARD DIAGNOSTIC
DTC P0222A6E407001082226
Diagnostic procedure
DTC P0222 Accelerator position sensor No.2 circuit low input
DETECTION
CONDITION•PCM monitors input voltage from accelerator position sensor No.2 while engine is running. If input voltage
from accelerator position sensor No.2 is below 0.3 V, PCM determines accelerator position sensor No.2
circuit low input.
POSSIBLE
CAUSE•Accelerator position sensor No.2 malfunction
•Connector or terminal malfunction
•Open circuit in wiring between accelerator position sensor terminal A and PCM terminal 90
•Short to GND in wiring between accelerator position sensor terminal C and PCM terminal 88
•Accelerator position sensor No.2 signal and GND circuits short each other
•PCM malfunction
STEP INSPECTION ACTION
1PERFORM DTC CONFIRMATION PROCEDURE
•Perform “DTC Confirmation Procedure”.
(See F2–85 DTC CONFIRMATION
PROCEDURE)
•Is same DTC present during KOEO or KOER
self-test?Yes Go to next step.
No Intermittent concern exists. Go to “Intermittent Concern
Troubleshooting”.
(See F2–227 INTERMITTENT CONCERN
TROUBLESHOOTING)
ACCELERATOR POSITION SENSOR NO.2
72
7
5
6
27
54
3
2
A
C
D90
88
91PCM
DC B
A
91
9010 PCM
HARNESS SIDE CONNECTOR ACCELERATOR POSITION SENSOR
HARNESS SIDE CONNECTOR

ON-BOARD DIAGNOSTIC
F2–133
F2
End Of Sie
2INSPECT POOR CONNECTION OF
ACCELERATOR POSITION SENSOR NO.2
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to Step 8.
No Go to next step.
3INSPECT ACCELERATOR POSITION SENSOR
NO.2 POWER CIRCUIT FOR OPEN
•Turn engine switch to ON. (Engine OFF).
•Inspect voltage at accelerator position sensor
terminal A (harness side).
•Is voltage below 1.0 V?Yes Repair or replace harness for open, go to Step 8.
No Go to next step.
4INSPECT ACCELERATOR POSITION SENSOR
NO.2 SIGNAL CIRCUIT FOR SHORT TO GND
•Turn engine switch to OFF.
•Inspect continuity between accelerator position
sensor terminal C and body GND.
•Is there continuity?Yes Repair or replace harness for short to GND, go to Step 8.
No Go to next step.
5INSPECT ACCELERATOR POSITION SENSOR
NO.2 CIRCUIT FOR SHORT WITH EACH OTHER
•Turn engine switch to OFF.
•Inspect continuity between accelerator position
sensor terminals C and D.
•Is there continuity?Yes Repair or replace harness for short with each other, go to
Step 8.
No Go to next step.
6INSPECT ACCELERATOR POSITION SENSOR
NO.2
•Inspect accelerator position sensor No.2.
(See F2–72 ACCELERATOR POSITION
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace accelerator position sensor, go to Step 8.
(See F2–44 ACCELERATOR PEDAL COMPONENT
DISASSEMBLY/ASSEMBLY)
No Go to next step.
7INSPECT POOR CONNECTION OF PCM
CONNECTOR
•Turn engine switch to OFF.
•Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Is there any malfunction?Yes Repair or replace suspected terminal, go to next step.
No Go to next step.
8VERIFY TROUBLESHOOTING OF DTC P0222
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from PCM memory using WDS or
equivalent.
•Perform KOEO/KOER self-test.
(See F2–86 KOEO/KOER SELF-TEST
PROCEDURE)
•Is same DTC present?Yes Replace PCM, go to next step.
(See F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
9VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
•Is there any DTC present?Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed. STEP INSPECTION ACTION