Dtc P0118 - Mazda Mazda6 Workshop Manual Supplement

DTC P0118

DTC P0118 ECT sensor circuit high input
• PCM monitors input voltage from ECT sensor while engine is running. If input voltage from ECT sensor is
DETECTION
CONDITION above 5.0 V, PCM determines ECT sensor circuit high input.
• ECT sensor malfunction
• Connector or terminal malfunction
• Short to power circuit in wiring between ECT sensor terminal A and PCM terminal 87
POSSIBLE
• Open circuit in wiring between ECT sensor terminal A and PCM terminal 87
CAUSE
• Open circuit in wiring between ECT sensor terminal B and PCM terminal 91
• PCM malfunction
ECT SENSOR
ECT SENSOR
HARNESS SIDE CONNECTOR
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform "DTC Confirmation Procedure".
(See F2–85 DTC CONFIRMATION
PROCEDURE)
• Is same DTC present during KOEO or KOER
self-test?
2 INSPECT POOR CONNECTION OF ECT
SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
3 CLASSIFY ECT SENSOR MALFUNCTION OR
HARNESS MALFUNCTION
• Turn engine switch to ON (Engine OFF).
• Connect jumper wire between ECT sensor
connector terminals.
• Access ECT PID using WDS or equivalent.
• Is ECT PID below 1.0 V?
ON-BOARD DIAGNOSTIC
4 6
A
B
B A
INSPECTION
PCM
5
87
5
6
91
PCM
HARNESS SIDE CONNECTOR
Yes Go to next step.
No Intermittent concern exists. Go to "Intermittent Concern
Troubleshooting".
(See F2–227 INTERMITTENT CONCERN
TROUBLESHOOTING)
Yes Repair or replace suspected terminal, go to Step 7.
No Go to next step.
Yes Replace ECT sensor, go to Step 7.
(See F2–76 ENGINE COOLANT TEMPERATURE (ECT)
SENSOR REMOVAL/INSTALLATION)
No Go to next step.
A6E407001082215
87
91
ACTION
F2–113
F2