Dtc P0117 - Mazda Mazda6 Workshop Manual Supplement

DTC P0117

DTC P0117 ECT sensor circuit low input
• PCM monitors input voltage from ECT sensor while engine is running. If input voltage from ECT sensor is
DETECTION
CONDITION below 0.1 V, PCM determines ECT sensor circuit low input.
• ECT sensor malfunction
• Connector or terminal malfunction
POSSIBLE
• Short to GND in wiring between ECT sensor terminal A and PCM terminal 87
CAUSE
• ECT sensor signal and GND circuits short each other
• PCM malfunction
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).
• Disconnect ECT sensor connector.
• Access ECT PID using WDS or equivalent.
• Is ECT PID below 0.1 V?
4 INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
SHORT TO GND
• Turn engine switch to OFF.
• Inspect continuity between ECT sensor
terminal A and body GND.
• Is there continuity?
ON-BOARD DIAGNOSTIC
A
B
ECT SENSOR
B
A
INSPECTION
5 6
4
87
5 6
91
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 Go to next step.
No Replace ECT sensor, go to Step 7.
(See F2–76 ENGINE COOLANT TEMPERATURE (ECT)
SENSOR REMOVAL/INSTALLATION)
Yes Repair or replace harness for short to GND, go to Step 7.
No Go to next step.
A6E407001082214
PCM
PCM
91
87
ACTION
F2–111
F2