Mazda 6. Manual — part 143
F–94
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0117
A6E397001084W16
5
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect PCM terminals 2E and 2H (harness-
side) for tightness using feeler tool.
• Are there any malfunction?
Yes Repair or replace terminal, then go to Step 9.
No
Go to next step.
6
INSPECT IAT SENSOR SIGNAL CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between MAF/IAT sensor
terminal D (harness-side) and PCM terminal
2E.
• Is there any continuity?
Yes Go to next step.
No
Repair or replace harness for open, then go to Step 9.
7
INSPECT IAT SENSOR GROUND CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between MAF/IAT sensor
terminal E (harness-side) and PCM terminal
2H.
• Is there continuity?
Yes Go to next step.
No
Repair or replace harness for open, then go to next step.
8
VERIFY TROUBLESHOOTING OF DTC P0113
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.
9
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 P0117
ECT circuit low input
DETECTION
CONDITION
• PCM monitors ECT sensor signal at PCM terminal 1M. If PCM detects ECT sensor voltage below 0.2 V,
PCM determines that the ECT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• 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
• ECT sensor malfunction
• Connect or terminal malfunction
• Short to ground circuit between ECT sensor terminal A and PCM connector terminal 1M.
• Short each harness ECT signal circuit and ECT ground circuit.
• PCM malfunction
ON-BOARD DIAGNOSTIC
F–95
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 TERMINAL BENT
• Turn ignition key to OFF.
• Disconnect ECT sensor connector.
• Inspect for bent of ECT sensor terminals A and
B (part-side).
• Is there any malfunction?
Yes Repair or replace terminal, then go to Step 6.
No
Go to next step.
3
CLASSIFY ECT SENSOR MALFUNCTION OR
HARNESS MALFUNCTION
• Connect WDS or equivalent to DLC-2.
• Access ECT PID.
• Verify ECT value when disconnecting ECT
sensor connector.
• Does ECT value change?
Yes Replace ECT sensor, then go to Step 6.
No
Go to next step.
4
INSPECT ECT SIGNAL CIRCUIT FOR SHORT
TO GROUND
• Turn ignition key to OFF.
• Inspect continuity between ECT sensor
terminal A (harness-side) and body ground.
• Is there any continuity?
Yes Repair or replace harness for short to ground, then go to
Step 6.
No
Go to next step.
5
INSPECT IAT CIRCUIT FOR SHORT
HARNESSES
• Inspect continuity between ECT sensor
terminal A and B (harness-side).
• Is there any continuity?
Yes Repair or replace harness for short, then go to next step.
No
Go to next step.
DTC P0117
ECT circuit low input
F–96
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0118
A6E397001084W17
6
VERIFY TROUBLESHOOTING OF DTC P0117
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.
7
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 P0118
ECT circuit high input
DETECTION
CONDITION
• PCM monitors ECT sensor signal at PCM terminal 1M. If PCM detects ECT sensor voltage above 4.6 V,
PCM determines that ECT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• 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
• ECT sensor malfunction
• Open circuit between ECT sensor terminal A and PCM terminal 1M
• Short to power circuit between ECT sensor terminal A and PCM terminal 1M
• Open circuit between ECT sensor terminal B and PCM terminal 2H
• Poor connection of ECT sensor or PCM connectors
• PCM malfunction
ON-BOARD DIAGNOSTIC
F–97
F
Diagnostic procedure
End Of Sie
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 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 8.
No
Go to next step.
3
CLASSIFY ECT SENSOR MALFUNCTION OR
HARNESS MALFUNCTION
• Connect WDS or equivalent to DLC-2.
• Access ECT PID.
• Connect a jumper wire between ECT sensor
terminals A and B.
• Verify ECT value
• Is voltage below 4.5 V?
Yes Replace ECT sensor, then go to Step 8.
No
Go to next step.
4
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
SHORT TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between ECT sensor terminal
A (harness-side) and body ground.
• Is there voltage B+?
Yes Repair or replace harness for short to power, then go to
Step 8.
No
Go to next step.
5
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out pins, corrosion, etc.).
• Are there any malfunction?
Yes Repair or replace terminal, then go to Step 8.
No
Go to next step.
6
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between ECT sensor
terminal A (harness-side) and PCM terminal
1M.
• Is there any continuity?
Yes Go to next step.
No
Repair or replace harness for open, then go to Step 8.
7
INSPECT ECT SENSOR GROUND CIRCUIT
FOR OPEN CIRCUIT
• Inspect continuity between ECT sensor
terminal B (harness-side) and PCM terminal
2H.
• Is there any continuity?
Yes Go to next step.
No
Repair or replace harness for open, then go to next step.
8
VERIFY TROUBLESHOOTING OF DTC P0118
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.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See
No
Troubleshooting completed.
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