Mazda CX-7 2007 Workshop Manual page 108

STEP
5 INSPECT ECT SIGNAL CIRCUIT FOR SHORT
TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between ECT sensor
terminal A (wiring harness-side) and body
ground.
• Is there continuity?
6 INSPECT ECT CIRCUIT FOR SHORT TO
WIRING HARNESSES
• Inspect for continuity between ECT sensor
terminal A and B (wiring harness-side).
• Is there continuity?
7 VERIFY TROUBLESHOOTING OF DTC P0117
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the M-MDS.
• Start the engine.
• Is the same DTC present?
8 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
DTC P0118[L3 WITH TC]
DTC P0118 ECT sensor circuit high input
• The PCM monitors the ECT sensor signal. If the PCM detects the ECT sensor voltage is above 4.6 V, the
PCM determines that the ECT sensor circuit has a malfunction.
Diagnostic support note
DETECTION
• This is a continuous monitor (Engine cooling system).
CONDITION
• The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
• ECT sensor malfunction
• Connect or terminal malfunction
• Open circuit in the wiring harness between ECT sensor terminal A and PCM terminal 2AH
POSSIBLE
• Short to power supply in the wiring harness between ECT sensor terminal A and PCM terminal 2AH
CAUSE
• Open circuit in the wiring harness between ECT sensor terminal B and PCM terminal 2AY
• PCM malfunction
01-02–66
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Repair or replace the wiring harness for a short to ground,
then go to Step 7.
No Go to the next step.
Yes Repair or replace the wiring harness for a short, then go to
the next step.
No Go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
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