engine MAZDA 6 2002 Workshop Manual Suplement

F2–130
ON-BOARD DIAGNOSTIC
End Of Sie
3INSPECT POOR CONNECTION OF IDM
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.
4INSPECT IDM CIRCUIT FOR SHORT TO GND
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—IDM terminal 2B and body GND.
—IDM terminal 2C and body GND.
—IDM terminal 2D and body GND.
—IDM terminal 2E and body GND.
—IDM terminal 2F and body GND.
•Is there continuity?Yes Repair or replace harness for short to GND, go to Step 9.
No Go to next step.
5INSPECT IDM CIRCUIT FOR SHORT TO
POWER
•Turn engine switch to ON (Engine OFF).
•Inspect voltage between following harnesses:
—IDM terminal 2B and body GND.
—IDM terminal 2C and body GND.
—IDM terminal 2D and body GND.
—IDM terminal 2E and body GND.
—IDM terminal 2F and body GND.
•Is voltage below 1.0 V?Yes Go to next step.
No Repair or replace harness for short to power, go to Step 9.
6INSPECT IDM
•Inspect IDM.
(See F2–84 INJECTOR DRIVER MODULE
(IDM) INSPECTION)
•Is there any malfunction?Yes Replace IDM, go to Step 9.
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 Step 9.
No Go to next step.
8INSPECT IDM CIRCUIT FOR OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—IDM terminal 2B and PCM terminal 30.
—IDM terminal 2C and PCM terminal 42.
—IDM terminal 2D and PCM terminal 44.
—IDM terminal 2E and PCM terminal 45.
—IDM terminal 2F and PCM terminal 43.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to next step.
9VERIFY TROUBLESHOOTING OF DTC P0200
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
F2–131
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

F2–134
ON-BOARD DIAGNOSTIC
DTC P0223A6E407001082227
Diagnostic procedure
DTC P0223 Accelerator position sensor No.2 circuit high 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 above 4.7 V, PCM determines accelerator position sensor No.2
circuit high input.
POSSIBLE
CAUSE•Accelerator position sensor No.2 malfunction
•Connector or terminal malfunction
•Accelerator position sensor No.2 power and signal circuits short each other
•Open circuit in wiring between accelerator position sensor terminal C and PCM terminal 88
•Open circuit in wiring between accelerator position sensor terminal D and PCM terminal 91
•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)
A
C
D90
88
91 ACCELERATOR POSITION SENSOR NO.2
91
9010 PCM
A
B C D
6
25
4
3
2
2
5
53
6
ACCELERATOR POSITION SENSOR
HARNESS SIDE CONNECTORPCM
HARNESS SIDE CONNECTOR

ON-BOARD DIAGNOSTIC
F2–135
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 7.
No Go to next step.
3INSPECT ACCELERATOR POSITION SENSOR
NO.2 CIRCUIT FOR SHORT WITH EACH OTHER
•Turn engine switch to OFF.
•Inspect continuity between accelerator position
sensor terminals A and C
•Is there continuity?Yes Repair or replace harness for short with each other, go to
Step 7.
No Go to next step.
4INSPECT 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 7.
(See F2–44 ACCELERATOR PEDAL COMPONENT
DISASSEMBLY/ASSEMBLY)
No Go to next step.
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 ACCELERATOR POSITION SENSOR
NO.2 CIRCUIT FOR OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—Accelerator position sensor terminal C and
PCM terminal 88.
—Accelerator position sensor terminal D and
PCM terminal 91.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to Step 7.
7VERIFY TROUBLESHOOTING OF DTC P0223
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.
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

F2–136
ON-BOARD DIAGNOSTIC
DTC P0300A6E407001082228
Diagnostic procedure
End Of Sie
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 the interval time exceeds preprogrammed criteria, PCM determines random misfire detection.
POSSIBLE
CAUSE•Fuel leakage or clogged in fuel line
•Fuel injector malfunction
•CKP sensor malfunction
•CMP sensor malfunction
•Inadequate engine compression
•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.
•Has P0200 been detected?Yes Go to DTC P0200 inspection.
(See F2–129 DTC P0200)
No Go to next step.
3INSPECT FUEL LINE
•Turn engine switch to OFF.
•Inspect for fuel leakage or clogs in following
fuel lines for each cylinder:
—Common rail and fuel injector.
—Fuel injector and fuel tank.
• Is there any malfunction?Yes Repair or replace suspected fuel line, go to Step 8.
No Go to next step.
4INSPECT FUEL INJECTOR
•Inspect fuel injector.
(See F2–56 FUEL INJECTOR INSPECTION)
•Is there any malfunction?Yes Replace fuel injector, go to Step 8.
(See F2–55 FUEL INJECTOR REMOVAL/INSTALLATION)
No Go to next step.
5INSPECT CKP SENSOR
•Inspect CKP sensor.
(See F2–82 CRANKSHAFT POSITION (CKP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CKP sensor, go to Step 8.
(See F2–81 CRANKSHAFT POSITION (CKP) SENSOR
REMOVAL/INSTALLATION)
No Go to next step.
6INSPECT CMP SENSOR
•Inspect CMP sensor.
(See F2–80 CAMSHAFT POSITION (CMP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CMP sensor, go to Step 8.
(See F2–80 CAMSHAFT POSITION (CMP) SENSOR
REMOVAL/INSTALLATION)
No Go to next step.
7INSPECT ENGINE COMPRESSION
•Inspect engine compression.
(See B2–8 COMPRESSION INSPECTION)
•Is there any malfunction?Yes Implement engine overhaul for repairs, go to next step.
No Go to next step.
8VERIFY TROUBLESHOOTING OF DTC P0300
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.
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.

ON-BOARD DIAGNOSTIC
F2–137
F2
DTC P0336A6E407001082229
Diagnostic procedure
End Of Sie
DTC P0336 CKP sensor circuit performance problem
DETECTION
CONDITION•PCM monitors input signal from CKP sensor while engine is running. If input signal from CKP sensor is not
proper pulse number, PCM determines CKP sensor circuit performance problem.
POSSIBLE
CAUSE•CKP sensor malfunction
•Connector or terminal malfunction
•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.
2VERIFY DTC P0336 DETECTED AGAIN
•Clear DTC from PCM memory using WDS or
equivalent.
•Start engine.
•Is same DTC present?Yes Go to next step.
No Intermittent concern exists. Go to “Intermittent Concern
Troubleshooting”.
(See F2–227 INTERMITTENT CONCERN
TROUBLESHOOTING)
3INSPECT POOR CONNECTION OF CKP
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 6.
No Go to next step.
4INSPECT CKP SENSOR
•Inspect CKP sensor.
(See F2–82 CRANKSHAFT POSITION (CKP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CKP sensor, go to Step 6.
(See F2–81 CRANKSHAFT POSITION (CKP) SENSOR
REMOVAL/INSTALLATION)
No Go to next step.
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 next step.
No Go to next step.
6VERIFY TROUBLESHOOTING OF DTC P0336
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.

F2–138
ON-BOARD DIAGNOSTIC
DTC P0337A6E407001082230
Diagnostic procedure
DTC P0337 CKP sensor circuit low input
DETECTION
CONDITION•PCM monitors input signal from CKP sensor while engine is running. If input signal from CKP sensor is not
input at 12 crankshaft revolutions, PCM determines CKP sensor circuit low input.
POSSIBLE
CAUSE•CKP sensor malfunction
•Connector or terminal malfunction
•Short to GND in wiring between CKP sensor terminal A and PCM terminal 29
•Short to GND in wiring between CKP sensor terminal B and PCM terminal 3
•Open circuit in wiring between CKP sensor terminal A and PCM terminal 29
•Open circuit in wiring between CKP sensor terminal B and PCM terminal 3
•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.
CKP SENSOR
A
B
5
4
3
62
25
3
6
29
3PCM
CKP SENSOR
HARNESS SIDE CONNECTORPCM
HARNESS SIDE CONNECTOR
A
BC
29 3

ON-BOARD DIAGNOSTIC
F2–139
F2
End Of Sie
2INSPECT POOR CONNECTION OF CKP
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 CKP SENSOR CIRCUIT FOR SHORT
TO GND
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—CKP sensor terminal A and body GND.
—CKP sensor terminal B and body GND.
•Is there continuity?Yes Repair or replace harness for short to GND, go to Step 7.
No Go to next step.
4INSPECT CKP SENSOR
•Inspect CKP sensor.
(See F2–82 CRANKSHAFT POSITION (CKP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CKP sensor, go to Step 7.
(See F2–81 CRANKSHAFT POSITION (CKP) SENSOR
REMOVAL/INSTALLATION)
No Go to next step.
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 CKP SENSOR CIRCUIT FOR OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—CKP sensor terminal A and PCM terminal
29.
—CKP sensor terminal B and PCM terminal 3.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to next step.
7VERIFY TROUBLESHOOTING OF DTC P0337
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