DTC P081D:2F [START STOP UNIT]

System malfunction location	Neutral switch signal mismatch
Detection condition	• With the ignition switched ON (engine off or on), the start unit detects that the vehicle speed changes from 0 km/h {0 mph} to 10 km/h{6.2 mph} for a continuous 5 or more times even though the neutral signal from the PCM is being received.
Fail-safe	• Perform the control with neutral switch signal turned off.
Possible cause	• DTCs are stored in the PCM. • Neutral switch malfunction • PCM malfunction • Start stop unit malfunction
System wiring diagram	—

System malfunction location

Neutral switch signal mismatch

Detection condition

• With the ignition switched ON (engine off or on), the start unit detects that the vehicle speed changes from 0 km/h {0 mph} to 10 km/h{6.2 mph} for a continuous 5 or more times even though the neutral signal from the PCM is being received.

Fail-safe

• Perform the control with neutral switch signal turned off.

Possible cause

• DTCs are stored in the PCM.

• Neutral switch malfunction

• PCM malfunction

• Start stop unit malfunction

System wiring diagram

—

Step	Inspection	Action
1	VERIFY PCM DTCs • Perform the DTC inspection for the PCM using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].)
No	Go to the next step.
2	INSPECT NEUTRAL SWITCH • Inspect the neutral switch. (See NEUTRAL SWITCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEUTRAL SWITCH INSPECTION [SKYACTIV-D 2.2].) • Is the neutral switch normal?	Yes	Go to the next step.
No	Replace the neutral switch, then go to Step 4. (See NEUTRAL SWITCH REMOVAL/INSTALLATION [C66M-R, C66MX-R].) (See NEUTRAL SWITCH REMOVAL/INSTALLATION [D66M-R, D66MX-R].)
3	VERIFY PCM DTCs • Perform the DTC inspection for the PCM using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].)
No	Go to the next step.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work 5 or more times. ― Drive the vehicle. ― Vehicle speed changes from 0 km/h {0 mph} to 10 km/h {6.2 mph}. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC P081D:2F displayed?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
No	Go to the next step.
5	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
No	DTC troubleshooting completed.

Step

Inspection

Action

VERIFY PCM DTCs

• Perform the DTC inspection for the PCM using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].)

• Is the DTC displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

(See DTC TABLE [SKYACTIV-D 2.2].)