ECT sensor
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(ECT) meter
To other sensors
6-48 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION POSSIBLE CAUSE
D Low engine coolant temperature (High voltage-High resistance)
or
D High engine coolant temperature (Low voltage-Low resistance)
D “Gr/W” circuit open or shorted to power
D “G” circuit open
D ECT sensor malfunction
D ECM (PCM) malfunction
NOTE:
Before inspecting, be sure to check that coolant temp. meter in combination meter indicates normal oper-
ating temperature (Engine is not overheating).
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
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