DTC 14

DIAGNOSTIC CHART





WIRING DIAGRAM





SENSOR VALUES CHART

INSPECTION PROCEDURE

Circuit Description:
The ECT Sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The
ECM applies a voltage on CKT C10 to the sensor. When the engine is cold the sensor (thermistor) resistance is high, therefore the ECM will see high signal voltage.
As the engine warms, the sensor resistance becomes less, and the voltage drops. At normal engine operating temperature (85°C to 95°C) the voltage will measure about 1.5 to 2.0 volts.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. DTC 14 will set if:
- Signal voltage indicates a ECT above 135°C (275°F) for 6 seconds.
2. This test will determine if CKT C10 is shorted to ground which will cause the conditions for DTC 14.

Diagnostic Aids:
Check harness routing for a potential short to ground in CKT C10.
"Scan" tool displays engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90°C then stabilize when thermostat opens.
Refer to "Intermittents" in "Symptoms".