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DTC P1793:14 [Mazda M Hybrid BATTERY]

id140204310900

Details On DTCs

Description	Mazda M Hybrid battery: Ignition switch signal malfunction
Detection condition	Determination conditions	•  The battery voltage is input to Mazda M Hybrid battery terminal 1A even though an ignition switch off signal is received via CAN communication.
	Preconditions	•  Mazda M Hybrid battery is any of the following conditions (PID: BECM_STAT) ―  STANDBY ―  PRECHARGE ―  READY •  The following DTCs are not detected: ―  U0073:00 and U0100:00
	Malfunction determination period	•  3 s period
	Drive cycle	•  1
	Self test type	•  CMDTC self test, ODDTC self test
	Sensor used	•  Mazda M Hybrid battery
Fail-safe function	•  Stops power supply from the Mazda M Hybrid battery and supplies power to the vehicle’s electrical devices (12 V power supply) from the 12 V battery. •  Inhibits the i-stop control. •  Inhibits the non-power generation control. •  Inhibits regenerative braking by the integrated starter generator (ISG). •  Inhibits motor assist control by the integrated starter generator (ISG).
Vehicle status when DTCs are output	•  If the vehicle continues to be driven while the DTC is detected, the 12 V battery will be depleted and the vehicle can no longer be driven. •  Inhibits the i-stop control.
Possible cause	•  Short to ground in PCM power supply circuit •  Open circuit in PCM power supply circuit •  Mazda M Hybrid battery connector malfunction •  F47 15 A fuse malfunction •  Short to ground in Mazda M Hybrid battery signal circuit •  Open circuit in Mazda M Hybrid battery signal circuit •  PCM malfunction ―  Ignition switch signal malfunction from PCM •  Mazda M Hybrid battery malfunction ―  Short in ignition switch signal terminal and body ground

Function Explanation (DTC Detection Outline)

Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Diagnostic Procedure

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION •  Record the snapshot data. Note •  Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY DC-DC CONVERTER (Mazda M Hybrid) DTC •  Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid). (See DTC INSPECTION.) •  Is the following DTC displayed for a present malfunction? ―  P1628:62	Yes	Go to Step 4.
		No	Go to the next step.
3	VERIFY INTEGRATED STARTER GENERATOR (ISG) DTC •  Perform the DTC inspection for the integrated starter generator (ISG). (See DTC INSPECTION.) •  Is the following DTC displayed for a present malfunction? ―  P1BC9:00	Yes	Go to the next step.
		No	Go to Step 6.
4	INSPECT PCM POWER SUPPLY CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	INSPECT PCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
6	INSPECT Mazda M Hybrid BATTERY CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	INSPECT Mazda M Hybrid BATTERY INTERNAL CIRCUIT FOR SHORT TO GROUND •  Verify that the Mazda M Hybrid battery connector is disconnected. •  Inspect for continuity between Mazda M Hybrid battery terminal 1A (part-side) and body ground. •  Is there continuity?	Yes	Replace the Mazda M Hybrid battery and perform the repair completion verification 1. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
		No	Go to the next step.
8	INSPECT F47 15 A FUSE •  Switch the ignition off. •  Remove the F47 15 A fuse. •  Inspect the F47 15 A fuse. •  Is the fuse normal?	Yes	Reinstall the F47 15 A fuse, then go to the next step.
		No	Replace the F47 15 A fuse and perform the repair completion verification 1.
9	INSPECT Mazda M Hybrid BATTERY SIGNAL CIRCUIT FOR SHORT TO GROUND •  Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [Mazda M Hybrid BATTERY].) Mazda M Hybrid battery: ―  DIO_IG •  Does the PID value fluctuate when the following connectors are shaken? ―  IG1 relay No.2 ―  Mazda M Hybrid battery	Yes	Repair or replace the applicable wiring harness or connector parts. Go to repair completion verification 1.
		No	Go to the next step.
10	INSPECT Mazda M Hybrid BATTERY SIGNAL CIRCUIT FOR OPEN CIRCUIT •  Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [Mazda M Hybrid BATTERY].) Mazda M Hybrid battery: ―  DIO_IG •  Does the PID value fluctuate when the following connectors are shaken? ―  IG1 relay No.2 ―  Mazda M Hybrid battery	Yes	Repair or replace the applicable wiring harness or connector parts. Go to repair completion verification 1.
		No	Go to the next step.
11	INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the PCM and perform the repair completion verification 1. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
		No	The system is normal. (Explain to the customer that a malfunction was detected temporarily, but the vehicle is currently normal.) •  Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the Mazda M Hybrid battery, then go to the next step. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.