DTC P058A:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P058A: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	Current sensor: Function malfunction
DETECTION CONDITION	Determination conditions	Error signal from the current sensor is received.
	Preconditions	Not applicable.
	Malfunction determination period	5 s period
	Drive cycle	2
	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	Connector or terminal malfunction of the following parts: Current sensor Front body control module (FBCM) PCM Short to ground or open circuit in current sensor power supply circuit Short to ground in wiring harness between battery positive terminal and current sensor terminal A MAIN 200 A fuse and/or ENG+B 7.5 A fuse malfunction Open circuit in wiring harness between battery positive terminal and current sensor terminal A Short to ground in wiring harness between the following terminals: Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL Short to power supply in wiring harness between the following terminals: Battery positive terminal—Current sensor terminal A Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL Open circuit in wiring harness between the following terminals: Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL Current sensor malfunction Front body control module (FBCM) malfunction PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

The current sensor detects the battery condition and sends the battery condition signal to the PCM via the FBCM. The PCM receives the battery condition signal from the current sensor and controls the battery. If the current sensor malfunctions, the battery is constantly charged because battery control is lost, which could cause the fuel economy to worsen.

The current sensor performs self-diagnosis on the battery voltage, battery fluid temperature and internal circuit, and if the PCM receives a malfunction signal from the current sensor, it stores a DTC.

Repeatability Verification Procedure

Start the engine.

Wait for 10 s (idle).

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 CURRENT SENSOR MALFUNCTION IS FALSELY RECOGNIZED BY DTC RELATED CAN OR LIN COMMUNICATION Switch the ignition off, then ON (engine off). 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 step.
2		No	Go to the next step.
3	PURPOSE: VERIFY IF CURRENT SENSOR MALFUNCTION IS FALSELY RECOGNIZED BY DTC RELATED TO FRONT BODY CONTROL MODULE (FBCM) Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].) Go to the troubleshooting procedure to perform the procedure from Step 1.
3		No	Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

Step 1—6

Perform inspection of each signal transmission system.

Step 7

Perform a unit inspection of the current sensor.

Step 8—9

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


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS NOTE: Always disconnect current sensor connector before disconnecting the negative battery cable. Switch the ignition off. Disconnect the connector of the following parts. Current sensor Front body control module (FBCM) PCM 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 8.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF OPEN CIRCUIT OR SHORT TO GROUND IN CURRENT SENSOR POWER SUPPLY CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Measure the voltage at the current sensor terminal A (wiring harness-side). Is the voltage 0 V?	Yes	Inspect the MAIN 200 A fuse and ENG+B 7.5 A fuse. If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. 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. If all fuses are normal: Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. 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 Step 8.
2		No	Go to the next step.
3	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Current sensor terminal B Front body control module (FBCM) terminal 2P Front body control module (FBCM) terminal 2N Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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 8.
3		No	Go to the next step.
4	PURPOSE: VERIFY IF SHORT TO POWER SUPPLY IN CURRENT SENSOR POWER SUPPLY CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Switch the ignition ON (engine off). NOTE: Another DTC may be stored by the PCM detecting an open circuit. Measure the voltage at the current sensor terminal A (wiring harness-side). Is the voltage above B+?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. 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 power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
4		No	Go to the next step.
5	PURPOSE: VERIFY IF SHORT TO POWER SUPPLY IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Measure the voltage at the following terminals (wiring harness-side): Current sensor terminal B Front body control module (FBCM) terminal 2P Front body control module (FBCM) terminal 2N Is the voltage 0 V?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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 power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
5		No	Go to the next step.
6	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Switch the ignition off. Inspect for continuity between the following terminals (wiring harness-side): Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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: Current sensor terminal B—Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2P—PCM terminal 2AK Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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 Step 8.
7	PURPOSE: DETERMINE INTEGRITY OF CURRENT SENSOR Inspect the current sensor. (See CURRENT SENSOR INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the current sensor, then go to the next step. (See CURRENT SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
7		No	Go to the next step.
8	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. 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 Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the PENDING CODE for this 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.
8		No	Go to the next step.
9	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].)
9		No	DTC troubleshooting completed.

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