2001 Chevrolet/Geo Camaro  

DTC P1115

Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor, that measures the temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance lowers. With high sensor resistance, the PCM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the ECT signal circuit. If the PCM detects an excessively high signal voltage, which is a low temperature indication, DTC P1115 sets.

Conditions for Running the DTC

The engine run time is more than 5 seconds.

Conditions for Setting the DTC

The PCM detects an intermittent low ECT sensor temperature while the engine is running, and the run time exceeds 5 seconds.

Action Taken When the DTC Sets
Conditions for Clearing the DTC
Diagnostic Aids
Test Description

The number below refers to the step number on the diagnostic table.

  1. If there are no driveability complaints associated with this DTC, and if the DTC does not reset, the system is OK.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2
  1. Install a scan tool.
  2. Turn ON the ignition.
  3. Start the engine.

Does the scan tool indicate that DTC P0118 also failed?

Go to DTC P0118

Go to Step 3

3
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the sensor connector and the PCM connector.

Does the scan tool indicate an abrupt change in value?

Go to Step 6

Go to Step 4

4
  1. Turn On the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the wiring harness at the sensor and the PCM.

Does the scan tool indicate an abrupt change in value?

Go to Step 7

Go to Step 5

5
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30  seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC, or within the parameters observed in the Freeze Frame/Failure Records.

Does the DTC reset ?

Go to Diagnostic Aids

System OK

6

Repair the connector or terminal as necessary. Refer to Circuit Testing , and to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

--

7

Repair the harness or wiring as necessary. Refer to Circuit Testing , and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

--

8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30  seconds.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

Go to Step 9

9

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to DTC P1114

System OK