DTC P0119
Diagnostic Instructions
DTC Descriptor
DTC P0119: Engine Coolant Temperature (ECT)
Sensor Circuit Intermittent
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
ECT Sensor Signal
|
P0117
|
P0116, P0118, P0119
|
P0118*, P0119*
|
P0116*
|
|
Low Reference
|
-
|
P0116, P0118, P0119
|
P0118*, P0119*
|
P0116*
|
|
* Internal ECM or sensor damage may occur if the circuit is
shorted to B+
|
Typical Scan Tool Data
ECT Sensor
|
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
|
Operating Conditions: Engine operating
in Closed Loop
Parameter Normal Range: -39 to
+142°C (-38 to +288°F) Varies with coolant temperature.
|
|
ECT Sensor Signal
|
143°C (289°F)
|
-40°C (-40°F)
|
-40°C (-40°F)*
|
|
Low Reference
|
-
|
-40°C (-40°F)
|
-40°C (-40°F)*
|
|
* Internal ECM or ECT sensor damage may occur if the circuit is
shorted to B+
|
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable
resistor that measures the temperature of the engine coolant. The
engine control module (ECM) supplies 5 V to the ECT signal
circuit and supplies an ground to the low reference circuit. The
ECM monitors the performance of the ECT sensor. If the ECM detects
excessive noise or rapid fluctuations in the ECT signal, this DTC
sets.
The following table illustrates the difference between
temperature, resistance, and voltage:
|
ECT
|
ECT Resistance
|
ECT Signal Voltage
|
|
Cold
|
High
|
High
|
|
Warm
|
Low
|
Low
|
Conditions for Running the DTC
| • |
DTC P0117 or P0118 is not set. |
| • |
The ignition is ON or the engine is
operating. |
| • |
DTC P0119 runs continuously once the above
conditions are met. |
Conditions for Setting the DTC
| • |
The ECM detects that the ECT changed
±5°C (±9°F) greater than the expected value
during a calibrated amount of time. |
| • |
The condition exists for approximately
1 min. |
Action Taken When the DTC Sets
DTC P0119 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0119 is a Type B DTC.
Diagnostic Aids
| • |
Test the ECT sensor at various temperature levels
in order to evaluate the possibility of a skewed sensor. A skewed
sensor can result in a DTC or a driveability condition. Refer to
Temperature Versus Resistance . |
| • |
If the vehicle has sat overnight, the Intake Air
Temperature (IAT) sensor and the ECT sensor values should display
within 3°C (5°F). |
| • |
After starting a cold engine, the ECT sensor
temperature should rise steadily, then stabilise after the
thermostat opens. |
| • |
High resistance on either the ECT sensor signal
circuit or the ECT sensor low reference circuit could set a
DTC. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Observe the scan tool engine coolant temperature (ECT)
sensor parameter, while moving the ECT sensor connector and the
K20 Engine Control Module connector. The ECT sensor parameter
should not fluctuate while moving the related harnesses and
connectors.
| ⇒ |
Repair the suspected harness or connection if the
ECT parameter fluctuates greater than 3°C (5°F) while
moving the related harnesses and connectors. |
- Inspect the engine coolant level. Verify that the
cooling system is operating correctly.
| ⇒ |
If you suspect a condition with engine cooling
system, refer to
Loss of Coolant . |
- 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.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
B34 Engine Coolant Temperature Sensor.
Caution: Do NOT use a test lamp
to test the continuity of the circuit. Damage to the control module
may occur due to excessive current draw.
Note: The control module or the
sensor may be damaged if the circuit is shorted to battery positive
voltage.
- Test for less than 5 Ω 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, or for a short to
voltage. If the circuit tests normal, replace the K20 Engine
Control Module. |
- Ignition ON, verify that the scan tool ECT sensor
parameter is at -40°C (-40°F).
| ⇒ |
If warmer than the specified value, test the
signal circuit terminal 1 for a short to ground. If the
circuit tests normal, replace the K20 Engine Control
Module. |
Note: If the fuse in the jumper
wire opens, the signal circuit is shorted to a voltage and the
sensor may be damaged.
- Ignition ON, install a 3 A fused jumper wire
between the signal circuit terminal 1 and the low reference
circuit terminal 2. Verify the ECT sensor parameter is greater
than 142°C (288°F).
| ⇒ |
If less than the specified value, 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. |
- If all circuits test normal, test or replace the
B34 Engine Coolant Temperature Sensor.
Component Testing
Static
- Ignition OFF, disconnect the harness connector at the
B34 Engine Coolant Temperature Sensor.
Note: A thermometer can be used
to test the sensor off the vehicle.
- Test the ECT sensor by varying the sensor temperature
while monitoring the sensor resistance. Compare the readings with
the
Temperature Versus Resistance table and verify that the
resistance is within 5% of the specification.
| ⇒ |
If not within the specified range, replace the
B34 Engine Coolant Temperature Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
