Mazda 3 - Dtc P0118 [Lf]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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• Inspect for bent of ECT sensor terminals A
and B (part-side).
• Is there any malfunction?
4
CLASSIFY ECT SENSOR MALFUNCTION
OR WIRING HARNESS MALFUNCTION
• Connect the WDS or equivalent to DLC-2.
• Access ECT PID.
• Verify ECT value when disconnecting ECT
sensor connector.
• Does the ECT value change?
Yes
Replace the ECT sensor, then go to Step 7.
No
Go to the next step.
5
INSPECT ECT SIGNAL CIRCUIT FOR
SHORT TO GROUND
• Turn the ignition switch off.
• Inspect continuity between ECT sensor
terminal A (wiring harness-side) and body
ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short
to ground, then go to Step 7.
No
Go to the next step.
6
INSPECT IAT CIRCUIT FOR SHORT
WIRING HARNESSES
• Inspect for continuity between ECT sensor
terminal A and B (wiring harness-side).
• Is there continuity?
Yes
Repair or replace the wiring harness for
short, then go to the next step.
No
Go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC
P0117 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [LF].)
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
(See AFTER REPAIR PROCEDURE [LF].)
• Are any DTC present?
Yes
Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF].)
No
Troubleshooting completed.
DTC P0118 [LF]
B3E010201084W14