Cruze

DTC P0116

The ECT sensor 1 is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor 1 signal circuit and supplies a ground for the low reference circuit.

The purpose of this diagnostic is to analyse the performance of the ECT sensor 1 by comparing the response and the range of the sensor signal to two distinct models under various operating conditions.

P0116 00

P0116 00 Engine Running, Sensor Signal Stuck Test

P0116 00 Engine Running, Sensor Within Range Test

DTC P0116 00 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation : 2.0L Diesel LNP → 1.4L LDD and LUJ → 2.0L Diesel LLW

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, observe the DTC information with a scan tool. Verify that DTC P0111 00, P0112 00, P0113 00, P0114 00, P0117 00, P0118 00, P0119 00 or P0128 00 is not set.

⇒	If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B34A Evaporator Temperature Sensor 1.
2. Ignition ON, clear the DTC information with a scan tool.
3. Ignition OFF, test for less than 5 Ω of resistance between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition ON, verify the scan tool ECT Sensor 1 parameter is at -40°C (-40°F).

⇒	If greater than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

5. Ignition ON, clear the DTC information with a scan tool.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.

6. Install a 1A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT sensor 1 parameter is greater than 128°C (262°F).

⇒	If less than specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

7. If all circuits test normal, test or replace the B34A Engine Coolant Temperature Sensor 1.

Static Test

1. Ignition OFF, disconnect the harness connector at the B34A Evaporator Temperature Sensor 1.

Note: A thermometer can be used to the used to test the sensor off the vehicle.

2. Test the B34A Engine Coolant Temperature Sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance : IAT → ECT table and verify that the resistance is within 5% of the specification.

⇒	If not within the specified range, replace the B34A Engine Coolant Temperature Sensor 1.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.