DTC P00B6
Diagnostic Instructions
DTC Descriptor
| DTC P00B6: Radiator Coolant Temperature (RCT)
- Engine Coolant Temperature (ECT) Not Plausible |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
RCT Sensor Signal
|
P00B3
|
P00B4
|
P00B4*
|
P00B6
|
Low Reference
|
-
|
P00B4
|
P00B4*
|
P00B6
|
*Engine control module (ECM) or sensor damage may occur if the
circuit is shorted to B+.
|
|
| |
Typical Scan Tool Data
Radiator Coolant Temperature Sensor
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: The ignition is
ON, or the engine is running.
Parameter Normal Range: Varies with
ambient temperature, within a range of -39 to +120°C (-38 to
+248°F).
|
RCT Sensor Signal
|
150°C (302°F)
|
-40°C (-40°F)
|
-40°C (-40°F)*
|
Low Reference
|
-
|
-40°C (-40°F)
|
-40°C -40°F)*
|
* Internal ECM or sensor damage may occur if the circuit is
shorted to B+.
|
|
| |
Circuit/System Description
The radiator coolant temperature (RCT) sensor is a variable
resistor that measures the temperature of the radiator coolant. The
ECM supplies 5 V to the RCT sensor signal circuit and supplies a
ground for the low reference circuit.
The following table illustrates the difference between
temperature, resistance, and voltage:
RCT
|
RCT Resistance
|
RCT Signal Voltage
|
Cold
|
High
|
High
|
Warm
|
Low
|
Low
|
|
| |
Conditions for Running the DTC
| • |
DTCs P00B3, P00B4, P0112,
P0113, P0117, or P0118 are not set. |
| • |
The ignition has been off for
greater than 8 h before vehicle is started. |
| • |
The ignition is ON, or the
engine is running. |
| • |
The intake air temperature
(IAT) is greater than -7°C (19°F). |
| • |
The fuel level is greater than
10%. |
| • |
The DTC runs once per ignition
cycle when the above conditions are met. |
Conditions for Setting the DTC
This DTC sets if one of the following conditions occurs for less
than 1 s:
| • |
The ECM detects the RCT sensor
and the ECT sensor are greater than a predetermined intake air
temperature at engine start-up. |
| • |
The ECM detects the RCT sensor
is 20°C (68°F) warmer than the ECT sensor at engine
start-up and the block heater has not been detected. |
| • |
The ECM detects the RCT sensor
is 20°C (68°F) warmer than the ECT sensor at engine
start-up and the engine has been cranking for greater than 10 s
without a fuel level sensor DTC. |
Action Taken When the DTC Sets
DTC P00B6 is a Type B DTC.
Conditions for Clearing the DTC
DTC P00B6 is a Type B DTC.
Diagnostic Aids
| • |
If the vehicle has sat
overnight, the RCT sensor and the ECT sensor values should display
within 3°C (5°F). |
| • |
As the thermostat opens, the
RCT sensor temperature should rise steadily, then stabilize once
the thermostat opens completely. |
| • |
Test the RCT sensor at various
temperature levels in order to evaluate the possibility of a skewed
sensor. |
| • |
Inspect for the correct
operation of the engine cooling system and verify the correct
coolant level. |
| • |
If the condition is
intermittent, allowing the vehicle to sit for greater than 8 h with
the ignition OFF, may help isolate the condition. Compare the scan
tool RCT and ECT temperature sensor values at Ignition ON. The RCT
sensor and the ECT sensor values should display within 3°C
(5°F). |
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views
Description and Operation
Cooling System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Ignition ON, observe the DTC
information with a scan tool. DTC P00B3, P00B4, P0117, P0118,
P0597, P0598, or P0599 should not be set. |
| 3. |
Engine idling for 15 min with
the A/C OFF. |
|
Note: Depending on
ambient temperature, it may take up to 4 min for the temperatures
to equalize.
|
| 4. |
Command the engine coolant
thermostat heater to 100% with a scan tool. Increase the engine
speed to 3 000 RPM. Observe the scan tool RCT and the ECT sensor
parameters. The RCT and the ECT sensor parameters should be within
20°C (68°F). |
| 5. |
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 B34B Engine Coolant Temperature Sensor
2. |
| 2. |
Ignition OFF for 1 min, 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. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 3. |
Ignition ON, verify the scan
tool Radiator Coolant Temperature Sensor parameter is -40°C
(-40°F). |
| ⇒ |
If greater than the specified range, test the
signal circuit terminal 1 for a short to ground. If the circuit
tests normal, replace K20 Engine Control Module. |
|
Caution: If
the fuse in the jumper wire opens, the signal circuit may have a
short to a voltage or a short to ground and the sensor might be
damaged. |
| 4. |
Install a 1 A fused jumper
wire between the signal circuit terminal 1 and the low reference
circuit terminal 2. Verify the scan tool Radiator Coolant
Temperature Sensor parameter is at 140°C (284°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. |
| 5. |
If all circuits test normal,
test or replace the B34B Engine Coolant Temperature Sensor
2. |
Component Testing
Static Test
| 1. |
Ignition OFF, disconnect the
harness connector at the B34B Engine Coolant Temperature Sensor
2. |
|
Note: A thermometer
can be used to the used to test the sensor off the vehicle.
|
| 2. |
Test the B34B Engine Coolant
Temperature Sensor 2 by varying the sensor temperature while
monitoring the sensor resistance. Compare the readings with the
table and verify that the resistance is within 5% of the
specification. |
| ⇒ |
If not within the specified range, replace the
B34B Engine Coolant Temperature Sensor 2. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
