DTC P16F9

DTC P16F9:  Powertrain Control Module (PCM) Internal Circuit Malfunction (Starter Control Circuit Malfunction)

General Description 

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

The starter control system prevents the starter from accidentally activating when the shift lever position is not in the P or N position (CVT) or the clutch pedal is released (M/T), or when the engine is running. If the vehicle is turned mistakenly while the shift lever position is not in P or N position (CVT) or the clutch pedal is released (M/T) or while the engine is running, the powertrain control module (PCM) will stop power to the starter cut relays. In this system, two starter cut relays are connected in series (starter cut relay 1, starter cut relay 2) to prevent the starter from running continuously due to a starter cut relay malfunction. To activate the starter, the starter control latch circuit and the drive cut circuit which are in the PCM are switched ON to apply power to the starter cut relays. When the starter control latch circuit ON malfunction is detected, the drive cut circuit shuts down output to the starter control latch circuit to prevent the starter from continuing to run. If the drive cut circuit return signal is LOW when the starter is ON, the PCM detects an OFF malfunction of the drive cut circuit and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	2.0 seconds or more

DTC Type

One drive cycle, MIL on

Enable Conditions 

Condition
Starter	ON

Malfunction Threshold 

The drive cut circuit (in the PCM) returns a signal LOW to the CPU for at least 2.0 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.

• Drive cut circuit OFF failure (PCM internal circuit 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 PCM 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.