2002 MAZDA 6 Workshop Manual Suplement

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

F2–140
ON-BOARD DIAGNOSTIC
DTC P0341A6E407001082231
Diagnostic procedure
End Of Sie
DTC P0341 CMP sensor circuit performance problem
DETECTION
CONDITION•PCM monitors input signal from CMP sensor while engine is running. If input signal from CMP sensor is not
proper pulse number, PCM determines CMP sensor circuit performance problem.
POSSIBLE
CAUSE•CMP 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 P0341 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 CMP
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 CMP SENSOR
•Inspect CMP sensor.
(See F2–80 CAMSHAFT POSITION (CMP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CMP sensor, go to Step 6.
(See F2–80 CAMSHAFT POSITION (CMP) 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 P0341
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
F2–141
F2
DTC P0342A6E407001082232
Diagnostic procedure
DTC P0342 CMP sensor circuit low input
DETECTION
CONDITION•PCM monitors input signal from CMP sensor while engine is running. If input signal from CMP sensor is not
input at 12 crankshaft revolutions, PCM determines CMP sensor circuit low input.
POSSIBLE
CAUSE•CMP sensor malfunction
•Connector or terminal malfunction
•Short to GND in wiring between CMP sensor terminal A and PCM terminal 81
•Short to GND in wiring between CMP sensor terminal B and PCM terminal 55
•Open circuit in wiring between CMP sensor terminal A and PCM terminal 81
•Open circuit in wiring between CMP sensor terminal B and PCM terminal 55
•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 CMP
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 CMP SENSOR CIRCUIT FOR SHORT
TO GND
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—CMP sensor terminal A and body GND.
—CMP 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.
A
B CMP SENSOR
A B
55
81 81
55PCM
3
2
2
4
4
6
6
5
5
CMP SENSOR
HARNESS SIDE CONNECTORPCM
HARNESS SIDE CONNECTOR

F2–142
ON-BOARD DIAGNOSTIC
End Of Sie
4INSPECT CMP SENSOR
•Inspect CMP sensor.
(See F2–80 CAMSHAFT POSITION (CMP)
SENSOR INSPECTION)
•Is there any malfunction?Yes Replace CMP sensor, go to Step 7.
(See F2–80 CAMSHAFT POSITION (CMP) 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 CMP SENSOR CIRCUIT FOR OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—CMP sensor terminal A and PCM terminal
81.
—CMP sensor terminal B and PCM terminal
55.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to next step.
7VERIFY TROUBLESHOOTING OF DTC P0342
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
F2–143
F2
DTC P0380A6E407001082233
Diagnostic procedure
DTC P0380 Glow plug relay circuit malfunction
DETECTION
CONDITION•PCM monitors input voltage from glow plug relay while engine is running. PCM determines glow plug relay
circuit malfunction if input voltage from glow plug relay is as following:
—1.0 V or below when glow plug relay is on.
—4.0 V or above when glow plug relay is off.
POSSIBLE
CAUSE•Glow plug relay malfunction
•Connector or terminal malfunction
•Short to GND in wiring between glow plug relay terminal D and PCM terminal 68
•Short to GND in wiring between glow plug fuse and glow plug relay terminal A
•Short to GND in wiring between glow plug relay terminal C and PCM terminal 86
•Short to power circuit in wiring between glow plug relay terminal D and PCM terminal 68
•Short to power circuit in wiring between glow plug relay terminal C and PCM terminal 86
•Glow plug relay power and signal circuits short each other
•Open circuit in wiring between glow plug fuse and glow plug relay terminal A
•Open circuit in wiring between glow plug relay terminal B and GND
•Open circuit in wiring between glow plug relay terminal D and PCM terminal 68
•Open circuit in wiring between glow plug relay terminal C and PCM terminal 86
•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 GLOW
PLUG RELAY 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.
A
B
C
D
GLOW FUSE
GLOW PLUG RELAY
AD
BC
6886
68 86PCM
54362
262
23598
4398
PCM
HARNESS SIDE CONNECTOR
7
GLOW PLUG RELAY
HARNESS SIDE CONNECTOR

F2–144
ON-BOARD DIAGNOSTIC
End Of Sie
3INSPECT GLOW PLUG RELAY CIRCUIT FOR
SHORT TO GND
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—Glow plug relay terminal A and body GND.
—Glow plug relay terminal C and body GND.
—Glow plug relay terminal D 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 GLOW PLUG RELAY CIRCUIT FOR
SHORT TO POWER
•Turn engine switch to ON (Engine OFF).
•Inspect voltage between following harnesses:
—Glow plug relay terminal C and body GND.
—Glow plug relay terminal D 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.
5INSPECT GLOW PLUG RELAY CIRCUIT FOR
SHORT WITH EACH OTHER
•Turn engine switch to OFF.
•Inspect continuity between glow plug relay
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.
6INSPECT GLOW PLUG RELAY CIRCUIT FOR
OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—Glow plug fuse and glow plug relay terminal
A.
—Glow plug relay terminal B and body GND.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to Step 9.
7INSPECT GLOW PLUG RELAY
•Inspect glow plug relay.
(See T–19 RELAY INSPECTION)
•Is there any malfunction?Yes Replace glow plug relay, go to Step 9.
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 Step 9.
No Go to next step.
9INSPECT GLOW PLUG RELAY CIRCUIT FOR
OPEN
•Turn engine switch to OFF.
•Inspect continuity between following
harnesses:
—Glow plug relay terminal D and PCM
terminal 68.
—Glow plug relay terminal C and PCM
terminal 86.
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open, go to next step.
10VERIFY TROUBLESHOOTING OF DTC P0380
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.
11VERIFY 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