DTC P0070

DTC P0070: Outside Air Temperature Sensor A/B Correlation

General Description

Courtesy of HONDA, U.S.A., INC.

The climate control unit monitors the outside air temperature with two connected temperature sensors. The value detected by the outside air temperature sensor is transmitted to the PCM, and the PCM starts the engine at extremely low temperature. The PCM stores the DTC if the difference between the two temperature sensors exceeds a set value.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	8 seconds or more
DTC Type	Two drive cycles, MIL on

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage	7 V	-

Malfunction Threshold

The temperature difference between outside air temperature sensor A and B shows a value exceeding 29 deg.F (16 deg.C) continuously for 8 seconds.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Outside air temperature sensor line short to ground
Outside air temperature sensor line open
Outside air temperature sensor GND line open
Outside air temperature sensor failure
Climate control unit failure

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 or by disconnecting the 12 volt battery.