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Home >> Chevrolet >> 2006 >> Optra (CANADA) L4-2.0L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0217

P0217




DTC P0217

DTC Descriptor
P0217
- Engine Coolant Over Temperature

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit Description

The engine control module (ECM) monitors the temperature of the engine coolant for engine control and as an enabling criteria for some diagnostics. The amount of air flow into an engine is proportional to the amount of heat an engine generates. The ECM monitors the amount of air flow into the engine to calculate engine coolant temperature (ECT). The ECM uses the calculated temperature to determine if the engine has warmed up to the thermostat regulating temperature. If the coolant temperature does not increase normally, does not reach the regulating temperature of the thermostat, or goes over the thermostat regulating temperature, diagnostics that use the ECT as enabling criteria may not run when expected. If the engine coolant temperature is stuck in range above a certain threshold, this DTC sets.

Conditions for Running the DTC

* DTCs P0116, P0117, P0118, P0125, and P0128 are not set.
* The engine is running.
* The engine has been at an idle state for 100-600 seconds.
* The startup engine coolant temperature is less than 50°C (122°F).
* The intake air temperature (IAT) is more than 35°C (95°F).
* The engine has been OFF for more than 6 hours.
OR
The start-up engine coolant temperature (ECT) is less than 45°C (113°F).
* This DTC runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects that the engine coolant temperature is greater than 110°C (230°F).

Action Taken When the DTC Sets

DTC P0217 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0217 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics Electrical Diagrams

Connector End View Reference
* Engine Control Module (ECM) Connector End Views Engine Control Module (ECM) Connector End Views
* Engine Controls Connector End Views Engine Controls Connector End Views

Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
* Scan Tool Data List Scan Tool Data List
* Scan Tool Data Definitions Scan Tool Data Definitions
* Scan Tool Output Controls Scan Tool Output Controls

Circuit/System Verification

1. Verify that DTCs P0480 and P0481 are not set.

• If DTCs P0480 or P0481 are set, refer to DTC P0480 or P0481 P0480.

2. Verify that the engine coolant level is correct.

• If the engine coolant is not at the correct level, refer to Loss of Coolant Loss of Coolant.

3. Verify that the engine coolant temperature is at normal operating temperature.

• If the engine coolant temperature is higher than the normal operating temperature, refer to Thermostat Diagnosis Thermostat Diagnosis.

4. Verify the correct operation of the cooling fans. Refer to Symptoms - Engine Cooling Symptoms - Engine Cooling.

• If the cooling fans are not operating correctly, refer to Symptoms - Engine Cooling Symptoms - Engine Cooling.

5. Operate the vehicle within the conditions for running the DTC. DTC P0217 should not set.
6. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the ECT sensor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.

• If greater than 5 ohms, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, using a scan tool verify that the ECT sensor parameter is at -40°C (-40°F).

• If greater than -40°C (-40°F), test the signal circuit of the ECT sensor for a short to ground. If the circuit tests normal, replace the ECM.

Important: If the signal circuit of the ECT sensor is shorted to voltage the ECT sensor may be damaged.


4. Install a 3 amp fused jumper wire between the signal circuit and the low reference circuit. Verify the ECT sensor parameter is greater than 128°C (262°F).

• If less than 128°C (262°F), test the signal circuit of the ECT sensor for a short to voltage or an open/high resistance. If the circuit test normal, replace the ECM.

5. If all circuits test normal, test or replace the ECT sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector of the ECT sensor.

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


2. Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature vs Resistance Temperature vs Resistance table and verify that the resistance is within 5 percent of the specification.

• If the resistance vs temperature is not within 5 percent, replace the ECT sensor.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification Diagnostic Repair Verification after completing the diagnostic procedure.


* Engine Coolant Temperature (ECT) Sensor Replacement Service and Repair
* Control Module References Control Module References for engine control module replacement, setup, and programming

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