Dtc P0118 [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Inspect for bent of ECT sensor terminals A
and B (part-side).
• Is there any malfunction?
CLASSIFY ECT SENSOR MALFUNCTION
OR WIRING HARNESS MALFUNCTION
• Connect the WDS or equivalent to DLC-2.
• Access ECT PID.
4
• Verify ECT value when disconnecting ECT
sensor connector.
• Does the ECT value change?
INSPECT ECT SIGNAL CIRCUIT FOR
SHORT TO GROUND
• Turn the ignition switch off.
5
• Inspect continuity between ECT sensor
terminal A (wiring harness-side) and body
ground.
• Is there continuity?
INSPECT IAT CIRCUIT FOR SHORT
WIRING HARNESSES
• Inspect for continuity between ECT sensor
6
terminal A and B (wiring harness-side).
• Is there continuity?
VERIFY TROUBLESHOOTING OF DTC
P0117 COMPLETED
• Make sure to reconnect all disconnected
connectors.
7
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
8
(See AFTER REPAIR PROCEDURE
• Are any DTC present?
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DTC P0118 [LF]

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Yes Replace the ECT sensor, then go to Step 7.
No Go to the next step.
Repair or replace the wiring harness for short
Yes
to ground, then go to Step 7.
No Go to the next step.
Repair or replace the wiring harness for
Yes
short, then go to the next step.
No Go to the next step.
Replace the PCM, then go to the next step.
Yes
(See PCM REMOVAL/INSTALLATION
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [LF].)
No Troubleshooting completed.
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B3E010201084W14