DTC P0A8D:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P0A8D:00 [SKYACTIV-G 2.5]

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: 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 after 30 s since system began switch to relay mode
	Preconditions	Not applicable.
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	Current sensor
FAIL-SAFE FUNCTION	Inhibits the i-ELOOP control.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates the 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 Capacitor (i-ELOOP) DC-DC converter Malfunction in the following fuses: C/U IG1 15 A fuse Short to ground in wiring harness between the following terminals: IG1 relay terminal C—DC-DC converter terminal 1H DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A Open circuit in wiring harness between the following terminals: IG1 relay terminal C—DC-DC converter terminal 1H DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A Current sensor malfunction Front body control module (FBCM) malfunction DC-DC converter malfunction PCM malfunction

System Wiring Diagram

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

Start the engine.

After leaving for 30 s with the engine idling and no electrical load, leave for 60 s at the maximum electrical load (50 A or more).

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 voltage	V	Displays the battery voltage

Function Inspection Using M-MDS


STEP	INSPECTION	RESULTS	ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
1		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 DC-DC converter DTC inspection using the M-MDS. (See DTC INSPECTION [i-ELOOP].) Are any DTCs present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [i-ELOOP].) Go to the next step.
2		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. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the PENDING CODE/DTC P058A:00 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC P058A:00 [SKYACTIV-G 2.5].) Go to the next step.
3		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. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) 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-G 2.5].) (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].) Go to the next troubleshooting procedure to perform the procedure from step 1.
4		No	Go to the next 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. (See BATTERY INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the battery, then go to Step 6. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
1		No	Go to the next step.
2	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS Switch the ignition off. Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Disconnect the connector of the following parts. Battery Current sensor PCM Capacitor (i-ELOOP) 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.
2		No	Go to the next step.
3	PURPOSE: INSPECT FUSE Remove the following fuses: C/U IG1 15 A fuse Inspect the following fuses: C/U IG1 15 A fuse Are all the fuses normal?	Yes	Install all the removed fuses, then go to the next step.
3		No	If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and DC-DC converter terminal 1H. 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, capacitor (i-ELOOP), and DC-DC converter connectors are disconnected. Remove the IG1 relay. Inspect for continuity between the following terminals (wiring harness-side) and body ground: IG1 relay terminal C DC-DC converter terminal 3A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: IG1 relay terminal C—DC-DC converter terminal 1H DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A 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.
4		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, capacitor (i-ELOOP), and DC-DC converter connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): IG1 relay terminal C—DC-DC converter terminal 1H DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: IG1 relay terminal C—DC-DC converter terminal 1H DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A 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. Reconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) 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 2.5].) Go to the next step.
6		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-G 2.5].)
7		No	DTC troubleshooting completed.

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