P1115

Circuit Description

The Engine Coolant Temperature (ECT) sensor is a thermistor, a sensor whose resistance varies with temperature. The ECT sensor signal is on CKT 410 and sensor ground on CKT 808. As the temperature increases, sensor resistance decreases. High coolant temperature will result in low signal voltage on CKT 410. DTC P1115 sets because the coolant temperature cannot be less than -38°C (-36°F) when IAT is greater than -5°C (23°F) or the vehicle has been driving long enough for the ECT temperature to increase above -38°C (-36°F).

Conditions for Running the DTC

^ DTCs P0112, P0113, P0117 and P0118 not set.
^ IAT sensor value -5°C (23°F) or greater.
OR
^ DTCs P0112, P0113, P0117, P0118, P0122 and P0123 not set.
^ Engine running and throttle angle 7 degrees or greater for at least 3.5 minutes.

Conditions for Setting the DTC

ECT -38°C (-36°F) or less.

Action Taken When the DTC Sets

^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ No message will be displayed.

Conditions for Clearing the DTC

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
^ Use a scan tool to clear DTCs.
^ Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended.

Diagnostic Aids

If fault is not present perform Powertrain Ground Check and also review Failure Rec. to determine conditions under which and how long ago the DTC set. Component Tests and General Diagnostics

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. Checking if DTC P0120 is also set. If it is, go there first because it may help to pinpoint a faulty TP sensor.
5. Checking for an intermittent short to voltage in the TP sensor 5 volt reference circuit or the TP sensor signal circuit that may be causing a high TP input.