DTC P0A8D:00 [PCM (SKYACTIV-D 2.2)]

id0102j5009400

DTC P0A8D:00

Power supply system circuit low input

DETECTION CONDITION

•  The battery positive voltage, the voltage for the PCM control, or the voltage for the DC-DC converter control is low when the engine is started.

Diagnostic support note

•  This is a continuous monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Not applicable

POSSIBLE CAUSE

•  Battery malfunction

•  Malfunction in DC-DC converter connector or terminal

•  Short to ground or open circuit in DC-DC converter power supply circuit

―  Short to ground in wiring harness between positive battery terminal and DC-DC converter terminal L

―  GLOW 80 A fuse malfunction

―  DCDC DE 40 A fuse malfunction

―  Open circuit in wiring harness between positive battery terminal and DC-DC converter terminal L

•  Short to ground or open circuit in DC-DC converter power supply circuit

―  Short to ground in wiring harness between IG1 relay terminal C and DC-DC converter terminal H

―  C/U IG1 15 A fuse malfunction

―  Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter terminal H

•  PCM connector or terminal malfunction

•  Current sensor malfunction

•  DC-DC converter malfunction

•  PCM malfunction

DTC P0A8D:00	Power supply system circuit low input
DETECTION CONDITION	• The battery positive voltage, the voltage for the PCM control, or the voltage for the DC-DC converter control is low when the engine is started. Diagnostic support note • This is a continuous monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Not applicable
POSSIBLE CAUSE	• Battery malfunction • Malfunction in DC-DC converter connector or terminal • Short to ground or open circuit in DC-DC converter power supply circuit ― Short to ground in wiring harness between positive battery terminal and DC-DC converter terminal L ― GLOW 80 A fuse malfunction ― DCDC DE 40 A fuse malfunction ― Open circuit in wiring harness between positive battery terminal and DC-DC converter terminal L • Short to ground or open circuit in DC-DC converter power supply circuit ― Short to ground in wiring harness between IG1 relay terminal C and DC-DC converter terminal H ― C/U IG1 15 A fuse malfunction ― Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter terminal H • PCM connector or terminal malfunction • Current sensor malfunction • DC-DC converter malfunction • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY OTHER RELATED DTCs

•  Switch the ignition OFF, and then switch it ON (engine off or on).

•  Display the DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)])

•  Has DTC P057F:00 been recorded?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC P057F:00 [PCM (SKYACTIV-D 2.2)])

No

Go to the next step.

2

INSPECT BATTERY

•  Switch the ignition OFF.

•  Inspect the battery.
(See BATTERY INSPECTION)

•  Is the battery normal?

Yes

Go to the next step.

No

Recharge or replace the battery, then go to Step 8.

(See BATTERY RECHARGING)

(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

3

INSPECT DC-DC CONVERTER CONNECTOR CONDITION

•  Switch the ignition OFF.

•  Disconnect the DC-DC converter connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 8.

4

INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

•  Verify that the DC-DC converter connector is disconnected.

•  Measure the voltage at DC-DC converter terminal L (vehicle wiring harness side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the GLOW 80 A fuse and DCDC DE 40 A fuse.

•  If the fuse is blown:

―  Repair or replace the wiring harness which is shorted to ground.

―  Replace the blown fuse.

•  If the fuse is damaged:

―  Replace the damaged fuse.

•  If both fuses are normal:

―  Repair or replace the wiring harness which has an open circuit.

Go to Step 8.

5

INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

•  Verify that the DC-DC converter connector is disconnected.

•  Switch the ignition ON (engine off).

•  Measure the voltage at DC-DC converter terminal H (vehicle wiring harness side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the C/U IG1 15 A fuse.

•  If the fuse is blown:

―  Repair or replace the wiring harness which is shorted to ground.

―  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

•  If the fuse is normal:

―  Repair or replace the wiring harness which has an open circuit.

Go to Step 8.

6

INSPECT PCM CONNECTOR CONDITION

•  Switch the ignition OFF.

•  Disconnect the PCM connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 8.

7

INSPECT DC-DC CONVERTER

•  Inspect the DC-DC converter.
(See DC-DC CONVERTER INSPECTION [SKYACTIV-D 2.2])

•  Is the DC-DC converter normal?

Yes

Replace the current sensor, then go to the next step.

(See CURRENT SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

No

Replace the DC-DC converter, then go to the next step.

(See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

8

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the disconnected connectors.

•  Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.
(See CLEARING DTC [PCM (SKYACTIV-D 2.2)])

•  Perform the KOER self-test.
(See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)])

•  Has DTC P0A8D:00 been recorded?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

No

Go to the next step.

9

VERIFY OTHER DTCs

•  Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY OTHER RELATED DTCs • Switch the ignition OFF, and then switch it ON (engine off or on). • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)]) • Has DTC P057F:00 been recorded?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P057F:00 [PCM (SKYACTIV-D 2.2)])
1		No	Go to the next step.
2	INSPECT BATTERY • Switch the ignition OFF. • Inspect the battery. (See BATTERY INSPECTION) • Is the battery normal?	Yes	Go to the next step.
2		No	Recharge or replace the battery, then go to Step 8. (See BATTERY RECHARGING) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
3	INSPECT DC-DC CONVERTER CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the DC-DC converter connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 8.
4	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Verify that the DC-DC converter connector is disconnected. • Measure the voltage at DC-DC converter terminal L (vehicle wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the GLOW 80 A fuse and DCDC DE 40 A fuse. • If the fuse is blown: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the blown fuse. • If the fuse is damaged: ― Replace the damaged fuse. • If both fuses are normal: ― Repair or replace the wiring harness which has an open circuit. Go to Step 8.
5	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Verify that the DC-DC converter connector is disconnected. • Switch the ignition ON (engine off). • Measure the voltage at DC-DC converter terminal H (vehicle wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the C/U IG1 15 A fuse. • If the fuse is blown: ― Repair or replace the wiring harness which is shorted to ground. ― Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness which has an open circuit. Go to Step 8.
6	INSPECT PCM CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
6		No	Repair or replace the connector, then go to Step 8.
7	INSPECT DC-DC CONVERTER • Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [SKYACTIV-D 2.2]) • Is the DC-DC converter normal?	Yes	Replace the current sensor, then go to the next step. (See CURRENT SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
7		No	Replace the DC-DC converter, then go to the next step. (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)]) • Perform the KOER self-test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)]) • Has DTC P0A8D:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
8		No	Go to the next step.
9	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
9		No	DTC troubleshooting completed.