DTC P0A8D:00 [SKYACTIV-D 2.2]

id0102s4009400

Note
•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION

Power supply system circuit low input
DETECTION CONDITION
Determination conditions
•  Any one of the following conditions is met:
―  Battery voltage is 7.25 V or less when engine restarts from i-stop.
―  DC-DC converter terminal voltage is 6 V or less when engine restarts from i-stop.
―  PCM terminal voltage is 6.2 V or less when engine starts.
―  Battery internal resistance is specified value or more.
―  Battery voltage is 11 V or less when engine is switched off.
Preconditions
•  Not applicable
Drive cycle
•  1
Self test type
•  CMDTC self test
Sensor used
•  Current sensor
FAIL-SAFE FUNCTION
•  Inhibits engine-stop by operating the i-stop function.
VEHICLE STATUS WHEN DTCs ARE OUTPUT
•  Flashes i-stop warning light (amber).
•  Illuminates master warning light
•  The engine cannot be started or the engine may stall due to battery voltage decrease.
POSSIBLE CAUSE
•  Battery malfunction
•  Connector or terminal malfunction of the following parts:
―  Battery
―  Current sensor
―  PCM
―  DC-DC converter
•  Malfunction in the following fuses:
―  GLOW 80 A fuse
―  DCDC DE 40 A fuse
•  Short to ground in wiring harness between the following terminals:
―  Battery positive terminal—DC-DC converter terminal L
•  Open circuit in wiring harness between the following terminals:
―  Battery positive terminal—DC-DC converter terminal L
•  Current sensor malfunction
•  Front body control module (FBCM) malfunction
•  DC-DC converter malfunction
•  PCM malfunction


System Wiring Diagram

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Function Explanation (DTC Detection Outline)

•  The PCM assures engine startability and power during driving based on control of the battery related parts. The PCM detects the battery voltage during engine starting and the battery internal resistance based on the current sensor signal, and if the battery voltage during engine starting is low or the battery internal resistance is high, it determines that there is a malfunction in the battery related parts and stores a DTC.

Repeatability Verification Procedure

1.  Start the engine.
2.  Perform battery condition initial setting (i-stop setting).

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item

Definition

Unit

Condition/Specification
BATT_CUR
Battery current
A
•  Displays the battery charge/discharge current value.
VPWR
Battery positive voltage
V
•  Switch the ignition ON (engine off): Approx. 12.78 V
•  Idle: Approx. 13.78 V


Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: 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.
No
Go to the next step.
2
PURPOSE: VERIFY IF POWER SUPPLY IS AFFECTED BY DTC RELATED TO DC-DC CONVERTER
•  Switch the ignition off, then ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Are DTCs related DC-DC converter recorded?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE [SKYACTIV-D 2.2].)
Go to the next step.
No
Go to the next step.
3
PURPOSE: VERIFY IF BATTERY VOLTAGE IS FALSELY RECOGNIZED BY DTC RELATED CURRENT SENSOR
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the PENDING CODE/DTC P058A:00 also present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC P058A:00 [SKYACTIV-D 2.2].)
Go to the next step.
No
Go to the next step.
4
PURPOSE: VERIFY IF BATTERY VOLTAGE IS FALSELY RECOGNIZED BY DTC RELATED CAN OR LIN COMMUNICATION
•  Perform the PCM and front body control module (FBCM) DTC inspection using the M-MDS.
•  Are DTCs related CAN or LIN communication recorded?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [SKYACTIV-D 2.2].)
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
Go to the troubleshooting procedure to perform the procedure from step 1.
No
Go to the troubleshooting procedure to perform the procedure from step 1.


Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure
•  Step 1
―  Perform a unit inspection of the battery.
•  Step 2—5
―  Perform the inspection for each power supply line.
•  Step 6—7
―  Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: DETERMINE INTEGRITY OF BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Replace the battery, then go to Step 6.
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
No
Go to the next step.
2
PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS
•  Switch the ignition off.
•  Disconnect the connector of the following parts.
―  Battery
―  Current sensor
―  PCM
―  DC-DC converter
•  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 6.
No
Go to the next step.
3
PURPOSE: INSPECT FUSE
•  Remove the following fuses:
―  GLOW 80 A fuse
―  DCDC DE 40 A fuse
•  Inspect the following fuses:
―  GLOW 80 A fuse
―  DCDC DE 40 A fuse
•  Are all the fuses normal?
Yes
Install all the removed fuses, then go to the next step.
No
If the fuse is blown:
•  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
―  Battery positive terminal—DC-DC converter terminal L
If there is a common connector:
―  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
―  Repair or replace the malfunctioning part.
If there is no common connector:
―  Repair or replace the wiring harness which has a short to ground.
―  Replace the malfunctioning fuse.
If the fuse is damaged:
•  Replace the malfunctioning fuse.
Go to Step 6.
4
PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS
•  Verify that the battery, current sensor, PCM and DC-DC converter connectors are disconnected.
•  Remove the IG1 relay.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  DC-DC converter terminal L
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Battery positive terminal—DC-DC converter terminal L
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 6.
No
Go to the next step.
5
PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS
•  IG1 relay is removed.
•  Verify that the battery, current sensor, PCM and DC-DC converter connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Battery positive terminal—DC-DC converter terminal L
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Battery positive terminal—DC-DC converter terminal L
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
6
PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Implement the repeatability verification procedure.
•  Perform the DTC Reading Procedure.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
7
PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION
•  Is any other DTC or pending code stored?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-D 2.2].)
No
DTC troubleshooting completed.