DTC P1D7B

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DTC P1D7B: Reactor Over Temperature (Traction Motor Control Module Detected)

General Description

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

The power control unit (PCU) monitors the reactor temperature sensor value to prevent malfunction of the reactor due to heat generation. If the reactor temperature sensor output temperature is a specified temperature for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	500 milliseconds or more11 seconds or more*
DTC Type	One drive cycle, MIL on, POWER SYSTEM indicator on

*: Symptom 1

**: Symptom 2

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage	8 V	-

Malfunction Threshold

One of these symptoms occurs:

Symptom 1

The reactor temperature sensor output temperature is more than 328 deg.F (164 deg.C) for at least 500 milliseconds.

Symptom 2

The reactor temperature sensor output temperature is more than 326 deg.F (163 deg.C) for at least 11 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.

Water pipe leak
Radiator fan control (RFC) unit failure
PCU electric coolant pump failure
PCU internal failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the motor control module memory.

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, and the freeze data can be cleared with the scan tool Clear command.