Specifications

Symptom:

P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLT-

AGE TOO LOW

When Monitored and Set Condition:

P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO

LOW

When Monitored: With the ignition on.

Set Condition: The Engine Coolant Temperature Sensor Signal voltage is below 0.1 volt

for more than 3 seconds.

POSSIBLE CAUSES

INTERMITTENT CONDITION

ECT SENSOR

ECT SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

ECT SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER

ENGINE CONTROL MODULE

TEST ACTION APPLICABILITY

1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the

engine/vehicle operating conditions under which the DTC was set. Some of

these conditions are displayed on the DRB at the same time the DTC is

displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to

duplicate these conditions may assist when checking for an active DTC.

Turn the ignition on.

With the DRB, monitor the Engine Coolant Temperature (ECT) Sensor voltage.

Is the ECT Sensor voltage below 0.1 volt?

All

Yes → Go To 2

No → Go To 6

2 Turn the ignition off.

Disconnect the ECT Sensor harness connector.

Turn the ignition on.

With the DRB, read the ECT Sensor voltage.

Is the voltage above 4.0 volts?

All

Yes → Replace the ECT Sensor in accordance with the Service Informa-

tion.

Perform ROAD TEST VERIFICATION - VER-2.

No → Go To 3

DRIVEABILITY - DIESEL