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 a 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 sensor (IAT) 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 stabilize
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
| 1. |
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. |
| 2. |
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 . |
| 3. |
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
| 1. |
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.
|
| 2. |
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. |
| 3. |
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.
|
| 4. |
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. |
| 5. |
If all circuits test normal,
test or replace the B34 Engine Coolant Temperature Sensor.
|
Component Testing
Static
| 1. |
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.
|
| 2. |
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.
|
