DTC P16F3
DTC P16F3: Starter Cut Relay 1 Control Circuit Low Voltage
General Description
The starter control system prevents the starter from accidentally activating when the shift position is not in the P or N position, or when the engine is running. If the vehicle is turned mistakenly while shift position is not in P or N or while the engine is running, the powertrain control module (PCM) will stop power to the starter cut relays. However, cranking to return from auto idle stop does not correspond to this. 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 only the STRLY1 return signal is LOW while the starter control latch circuit is OFF, the PCM detects a malfunction of the STRLY1 line and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
| Execution | Continuous |
| Sequence | None |
| Duration | 5 seconds or more |
| DTC Type | One drive cycle, MIL off |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The STRLY1 return signal is LOW for at least 5 seconds when the starter is OFF.
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.
- Starter cut relay STRLY1 line short to ground
- Starter cut relay STRLY1 line open
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.