Mazda 2002 6 - Page 226

ON-BOARD DIAGNOSTIC
F–97
F
Diagnostic procedure
End Of Sie
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
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.
(See F–66 KOEO/KOER SELF-TEST.)
• Is same DTC present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
9 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See F–66 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.