DTC P0A8D:00 [SKYACTIV-G 2.0]

id0102h1009400

DTC P0A8D:00

Power supply system circuit low input

DETECTION CONDITION

•  Any of the values for the battery voltage, voltage for PCM control, and voltage for DC-DC converter control is low when the engine is started.

Diagnostic support note

•  This is a continuous monitor (other).

•  The MIL does not illuminate.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

•  The DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Inhibits engine-stop by operating the i-stop function.

•  Inhibits a part of the generator output control.

POSSIBLE CAUSE

•  Battery malfunction

•  DC-DC converter connector or terminals malfunction

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

―  Short to ground in wiring harness between DCDC 40 A fuse and DC-DC converter terminal L

―  DCDC 40 A fuse malfunction

―  Open circuit in wiring harness between battery positive 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 METER 15 A fuse and DC-DC converter terminal H

―  METER 15 A fuse malfunction

―  Open circuit in wiring harness between ignition switch (IG1)^*1/relay block (IG1 relay)^*2 and DC-DC converter terminal H

•  PCM connector or terminals malfunction

•  DC-DC converter malfunction

•  Current sensor malfunction

•  PCM malfunction

DTC P0A8D:00	Power supply system circuit low input
DETECTION CONDITION	• Any of the values for the battery voltage, voltage for PCM control, and voltage for DC-DC converter control is low when the engine is started. Diagnostic support note • This is a continuous monitor (other). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. • The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Inhibits engine-stop by operating the i-stop function. • Inhibits a part of the generator output control.
POSSIBLE CAUSE	• Battery malfunction • DC-DC converter connector or terminals malfunction • Short to ground or open circuit in DC-DC converter power supply circuit ― Short to ground in wiring harness between DCDC 40 A fuse and DC-DC converter terminal L ― DCDC 40 A fuse malfunction ― Open circuit in wiring harness between battery positive 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 METER 15 A fuse and DC-DC converter terminal H ― METER 15 A fuse malfunction ― Open circuit in wiring harness between ignition switch (IG1)^1/relay block (IG1 relay)^2 and DC-DC converter terminal H • PCM connector or terminals malfunction • DC-DC converter malfunction • Current sensor malfunction • PCM malfunction

*1 :Vehicles without advanced keyless entry and push button start system

*2 :Vehicles with advanced keyless entry and push button start system

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition to off, then to ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) • Is the PENDING CODE/DTC P057F:00 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC P057F:00 [SKYACTIV-G 2.0].)
2		No	Go to the next step.
3	INSPECT BATTERY • Switch the ignition to off. • Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 9. (See BATTERY RECHARGING [SKYACTIV-G 2.0].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
3		No	Go to the next step.
4	INSPECT DC-DC CONVERTER CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the DC-DC converter connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
4		No	Go to the next step.
5	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the DC-DC converter connector is disconnected. • Measure the voltage at the DC-DC converter terminal L (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the DCDC 40 A fuse. • If the fuse is blown: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deteriorated: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to Step 9.
6	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the DC-DC converter connector is disconnected. • Switch the ignition to ON (engine off). • Measure the voltage at the DC-DC converter terminal H (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
6		No	Inspect the METER 15 A fuse. • If the fuse is blown: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deteriorated: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to Step 9.
7	INSPECT PCM CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
7		No	Go to the next step.
8	INSPECT DC-DC CONVERTER • Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Replace the DC-DC converter, then go to the next step. (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
8		No	Replace the current sensor, then go to the next step. (See CURRENT SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.0].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-G 2.0].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.0].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0].)
10		No	DTC troubleshooting completed.