DTC P0A12:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P0A12:00 [SKYACTIV-G 2.5]

NOTE:

To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.

Details On DTCs


DESCRIPTION	DC-DC converter: low input/output
DETECTION CONDITION	Determination conditions	Any one of the following conditions is met: Any DC-DC converter terminal value, either 3A or 4A, is specified value or less Ignition switch ON condition detected by DC-DC converter and PCM differ
	Preconditions	Not applicable
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	Not applicable
FAIL-SAFE FUNCTION	Depending on the type of malfunction, any of the following controls may be implemented. Transition to i-ELOOP bypass mode. i-ELOOP bypass mode inhibited.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	A warning message is displayed on the LCD. If the vehicle continues to be driven while the DTC is detected the battery will be depleted. A malfunction occurs with an electrical device and the vehicle stops. The following vehicle conditions differ depending on the type of malfunction: Pre-charge warning is displayed.
POSSIBLE CAUSE	Connector or terminal malfunction of the following parts: PCM Generator Battery Capacitor (i-ELOOP) DC-DC converter Electric load part connected to C/U IG1 15 A fuse Malfunction in the following fuses: STARTER 250 A fuse Short to ground in wiring harness between the following terminals: Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Capacitor (i-ELOOP) terminal 3A—DC-DC converter terminal 3A Battery positive terminal—DC-DC converter terminal 4A IG1 relay terminal C—DC-DC converter terminal 1H (DTC P1628:11 may be detected simultaneously) IG1 relay terminal C—Generator terminal 2C (DTC P1628:11, P2503:00 may be detected simultaneously) Electric load part connected to C/U IG1 15 A fuse—C/U IG1 15 A fuse Open circuit in wiring harness between the following terminals: Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Capacitor (i-ELOOP) terminal 3A—DC-DC converter terminal 3A Battery positive terminal—DC-DC converter terminal 4A IG1 relay terminal C—DC-DC converter terminal 1H (DTC P1628:11 may be detected simultaneously) Electric load part connected to C/U IG1 15 A fuse—C/U IG1 15 A fuse DC-DC converter malfunction PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

When the charge/discharge circuit for the power supplying the vehicle is normal, the vehicle will operate normally.In this diagnostic, a malfunction in the DC-DC converter output line is detected, and verification of vehicle malfunctions/safety assurance is performed.

Repeatability Verification Procedure

Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].)

Start the engine.

Leave for 180 s while idling with no electrical load.

Leave for 30 s while idling with high electrical load.

PID Item/Simulation Item Used In Diagnosis

Not applicable

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].) Is the PENDING CODE/DTC U3000:49 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC U3000:49 [i-ELOOP].) Go to the next step.
2		No	Go to the next step.
3	PURPOSE: VERIFY IF POWER SUPPLY IS AFFECTED BY DTC RELATED TO DC-DC CONVERTER Perform the DC-DC converter DTC inspection using the M-MDS. (See DTC INSPECTION [i-ELOOP].) Is the PENDING CODE/DTC P1628:11 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC P1628:11 [i-ELOOP].) Go to the next step.
3		No	Go to the next step.
4	PURPOSE: DETERMINE IF MALFUNCTION CAUSED BY DC-DC CONVERTER Start the engine. Is “i-ELOOP charging. Stop the vehicle and wait a minute” displayed in the LCD?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
4		No	Go to the next step.
5	PURPOSE: DETERMINE LOCATION OF MALFUNCTION OCCURRENCE FROM BLOWN STARTER 250 A FUSE Switch the ignition off. Inspect the STARTER 250 A fuse. Is the STARTER 250 A fuse blown?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 4.
5		No	Go to the troubleshooting procedure to perform the procedure from Step 6.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

Step 1—3

Verifying malfunction related to DC-DC converter 3A terminal

Step 4—6

Verifying malfunction related to DC-DC converter 4A terminal

Step 7—8

Verifying/replacing malfunctioning part

Step 9—10

Verify that primary malfunction is resolved and there are no other malfunctions.


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS 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. Generator DC-DC converter Capacitor (i-ELOOP) Inspect for continuity between the following terminals (wiring harness-side) and body ground: Generator terminal 1A Capacitor (i-ELOOP) terminal 2A Capacitor (i-ELOOP) terminal 3A 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: Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Capacitor (i-ELOOP) terminal 3A—DC-DC converter 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 3.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the generator, capacitor (i-ELOOP), and DC-DC converter connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Capacitor (i-ELOOP) terminal 3A—DC-DC converter terminal 3A Is there continuity?	Yes	Go to Step 6.
2		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Capacitor (i-ELOOP) terminal 3A—DC-DC converter 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.
3	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. Reconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Start the engine. Is "i-ELOOP charging? Stop the vehicle and wait a minute" displayed in the LCD, and the master warning light illuminated after approx. 3 min?	Yes	NOTE: A fuse is blown in the capacitor (i-ELOOP) due to excess current can be considered. Replace the capacitor (i-ELOOP). (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].) Go to Step 9.
3		No	Go to Step 9.
4	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Switch the ignition off. Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Disconnect the DC-DC converter connector. Inspect for continuity between the following terminals (wiring harness-side) and body ground: DC-DC converter terminal 4A 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 4A 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 STARTER 250 A fuse. Go to Step 9.
4		No	Go to the next step.
5	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Repelace the STARTER 250 A fuse. Always reconnect all disconnected connectors. Reconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Start the engine. Inspect the STARTER 250 A fuse. Is the STARTER 250 A fuse blown?	Yes	Replace the STARTER 250 A fuse and DC-DC converter. (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP].) Go to Step 9.
5		No	Go to Step 9.
6	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Switch the ignition off. Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Disconnect the DC-DC converter connector. Inspect for continuity between the following terminals (wiring harness-side): Battery positive terminal—DC-DC converter terminal 4A Is there continuity?	Yes	Go to the next step.
6		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 4A 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.
7	PURPOSE: VERIFY IF MALFUNCTION OCCURRING IS CAUSED BY WIRING HARNESS/CONNECTOR LOSS Have all the wiring harnesses/connectors which can be considered the cause of DTC P0A12:00 been inspected?	Yes	Go to the next step.
7		No	Inspect all the related wiring harnesses/connectors. If there is a malfunction Repair or replace the connector and/or terminals, then go to Step 9. If there is no malfunction Go to the next step.
8	PURPOSE: VERIFY DC-DC CONVERTER REPLACEMENT RECORD Is the DC-DC converter being replaced within the troubleshooting diagnostic procedure this time?	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
8		No	Replace the DC-DC converter. (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP].) Go to the next step.
9	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 7.
9		No	Go to the next step.
10	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].)
10		No	DTC troubleshooting completed.

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