DTC Advanced Diagnostics: P00B6 (3.0L Engine)
DTC P00B6: Engine Coolant Temperature (ECT) Sensor 2 Incorrect Correlation
General Description
The four sensors that are used in the fuel system compare each other at the time of vehicle ON mode after enough time of vehicle soak for detecting malfunction. If the temperature of engine coolant temperature (ECT) sensor 2 is different from the other sensors, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 10 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Engine off time | 6 hours | - |
| Temperature difference between four temperature sensors | 36 deg.F (20 deg.C) | - |
| Engine speed [Engine Speed] | 530 rpm | - |
| 12 volt battery voltage [Battery] | 10.5 V | - |
[ ]: HDS Parameter
Malfunction Threshold
- Offset to high
Measured ECT sensor 2 temperature - (minus) maximum value of other temperature sensor is more than 57.6 deg.F (32 deg.C) for at least 10 seconds.
- Offset to low
Measured ECT sensor 2 temperature - (minus) minimum value of other temperature sensor is less than -57.6 deg.F (-32 deg.C) for at least 10 seconds.
Possible Cause
- ECT sensor 2 failure
Confirmation Procedure
Operating Condition
- Turn the vehicle to the OFF (LOCK) mode, and wait at least 6 hours.
- Start the engine, and let it idle for at least 10 seconds.
- Do not use an engine block heater because the engine coolant temperature will not stay equal during engine stop.
- When freeze data or the on-board snapshot is stored, test the vehicle under an ambient temperature close to the intake air temperature in the freeze data or the on-board snapshot.
- When an ambient temperature extremely changes, malfunction judgment may not execute. Avoid extreme temperature changing condition after or before engine start. (When the vehicle is parked in the garage, open the garage door to introduce outside air; then start the engine.)
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.