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DTC P1793:12 [Mazda M Hybrid BATTERY]

id140204310800

Details On DTCs

Description	Mazda M Hybrid battery: Ignition switch signal malfunction
Detection condition	Determination conditions	•  The battery voltage is not input to Mazda M Hybrid battery terminal 1A even though an ignition switch on 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 circuit in Mazda M Hybrid battery power supply circuit and signal circuit •  PCM malfunction ―  Ignition switch signal malfunction from PCM •  Mazda M Hybrid battery malfunction ―  Short in ignition switch signal terminal and battery power supply terminal

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 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.
8	INSPECT SHORT TO EACH OTHER IN Mazda M Hybrid BATTERY INTERNAL CIRCUITS •  Verify that the Mazda M Hybrid battery connector is disconnected. •  Inspect for continuity between Mazda M Hybrid battery terminal 1A (part-side) and 1D (part-side). •  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.
9	INSPECT Mazda M Hybrid BATTERY POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT CIRCUIT •  Inspect the applicable circuits for a short 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.
10	INSPECT PCM FOR MALFUNCTION •  Switch the ignition ON (engine off or on). •  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: ―  VEH_POWER_CONDITION •  Is the PID monitor value “IG SW ON”?	Yes	Go to the next step.
		No	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].)
11	INSPECT Mazda M Hybrid BATTERY 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 Mazda M Hybrid battery and perform the repair completion verification 1. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
		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.