DTC U3003:16 [CONNECTIVITY MASTER UNIT (E)]

id1602a10095a4

Without Mazda M Hybrid

Outline

System malfunction location

Connectivity master unit (CMU) low power supply voltage input

Detection condition

•  The connectivity master unit (CMU) detects that the connectivity master unit (CMU) power supply circuit voltage was 4.53—7.45 V for 30 s.

Fail-safe

•  The connectivity master unit (CMU) is put in sleep mode and it does not launch.

Possible cause

•  DTCs are stored in the PCM.

•  Battery malfunction

•  Malfunction in generator

•  Connectivity master unit (CMU) connector or terminal malfunction

•  Short to ground or open circuit in connectivity master unit (CMU) power supply circuit

•  Connectivity master unit (CMU) malfunction

System malfunction location	Connectivity master unit (CMU) low power supply voltage input
Detection condition	• The connectivity master unit (CMU) detects that the connectivity master unit (CMU) power supply circuit voltage was 4.53—7.45 V for 30 s.
Fail-safe	• The connectivity master unit (CMU) is put in sleep mode and it does not launch.
Possible cause	• DTCs are stored in the PCM. • Battery malfunction • Malfunction in generator • Connectivity master unit (CMU) connector or terminal malfunction • Short to ground or open circuit in connectivity master unit (CMU) power supply circuit • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT PCM FOR MALFUNCTION

•  Perform the DTC inspection for the PCM.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual)

(Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)

No

Go to the next step.

2

INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  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.

3

INSPECT CONNECTIVITY MASTER UNIT (CMU) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the applicable circuit for a short to ground and an open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT BATTERY FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [BATTERY INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [BATTERY RECHARGING] in the workshop manual)

(Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)

5

INSPECT GENERATOR FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [GENERATOR INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)

6

INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(Refer to the [TROUBLESHOOTING PROCEDURE] in the workshop manual)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  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.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT PCM FOR MALFUNCTION • Perform the DTC inspection for the PCM. (Refer to the [DTC INSPECTION] in the workshop manual) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual) (Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)
No	Go to the next step.
2	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • 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.
3	INSPECT CONNECTIVITY MASTER UNIT (CMU) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the applicable circuit for a short to ground and an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT BATTERY FOR MALFUNCTION • Inspect the applicable part. (Refer to the [BATTERY INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [BATTERY RECHARGING] in the workshop manual) (Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)
5	INSPECT GENERATOR FOR MALFUNCTION • Inspect the applicable part. (Refer to the [GENERATOR INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)
6	INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (Refer to the [TROUBLESHOOTING PROCEDURE] in the workshop manual) If DTC is displayed • Repeat the diagnosis from Step 1. If DTC is not displayed • 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. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

With Mazda M Hybrid

Outline

System malfunction location

Connectivity master unit (CMU) low power supply voltage input

Detection condition

•  The connectivity master unit (CMU) detects that the connectivity master unit (CMU) power supply circuit voltage was 4.53—7.45 V for 30 s.

Fail-safe

•  The connectivity master unit (CMU) is put in sleep mode and it does not launch.

Possible cause

•  DTCs are stored in the following modules.

―  PCM

―  Mazda M Hybrid battery

―  DC-DC converter (Mazda M Hybrid)

―  Integrated starter generator (ISG)

•  Battery malfunction

•  Connectivity master unit (CMU) connector or terminal malfunction

•  Short to ground or open circuit in connectivity master unit (CMU) power supply circuit

•  Connectivity master unit (CMU) malfunction

System malfunction location	Connectivity master unit (CMU) low power supply voltage input
Detection condition	• The connectivity master unit (CMU) detects that the connectivity master unit (CMU) power supply circuit voltage was 4.53—7.45 V for 30 s.
Fail-safe	• The connectivity master unit (CMU) is put in sleep mode and it does not launch.
Possible cause	• DTCs are stored in the following modules. ― PCM ― Mazda M Hybrid battery ― DC-DC converter (Mazda M Hybrid) ― Integrated starter generator (ISG) • Battery malfunction • Connectivity master unit (CMU) connector or terminal malfunction • Short to ground or open circuit in connectivity master unit (CMU) power supply circuit • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY DTCs

•  Perform the DTC inspection for the following modules.
(Refer to the [DTC INSPECTION] in the workshop manual)

―  PCM

―  Mazda M Hybrid battery

―  DC-DC converter (Mazda M Hybrid)

―  Integrated starter generator (ISG)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)

(Refer to the [DTC TABLE [PCM (SKYACTIV-X)]] in the workshop manual)

(Refer to the [DTC TABLE [Mazda M Hybrid BATTERY]] in the workshop manual)

(Refer to the [DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)]] in the workshop manual)

(Refer to the [DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)]] in the workshop manual)

No

Go to the next step.

2

INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  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.

3

INSPECT CONNECTIVITY MASTER UNIT (CMU) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the applicable circuit for a short to ground and an open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT BATTERY FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [BATTERY INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [BATTERY RECHARGING] in the workshop manual)

(Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)

5

INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification.

(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(Refer to the [TROUBLESHOOTING PROCEDURE] in the workshop manual)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  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.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY DTCs • Perform the DTC inspection for the following modules. (Refer to the [DTC INSPECTION] in the workshop manual) ― PCM ― Mazda M Hybrid battery ― DC-DC converter (Mazda M Hybrid) ― Integrated starter generator (ISG) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual) (Refer to the [DTC TABLE [PCM (SKYACTIV-X)]] in the workshop manual) (Refer to the [DTC TABLE [Mazda M Hybrid BATTERY]] in the workshop manual) (Refer to the [DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)]] in the workshop manual) (Refer to the [DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)]] in the workshop manual)
1		No	Go to the next step.
2	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT CONNECTIVITY MASTER UNIT (CMU) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the applicable circuit for a short to ground and an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT BATTERY FOR MALFUNCTION • Inspect the applicable part. (Refer to the [BATTERY INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [BATTERY RECHARGING] in the workshop manual) (Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)
5	INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, replace the malfunctioning location and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
5		No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (Refer to the [TROUBLESHOOTING PROCEDURE] in the workshop manual) If DTC is displayed • Repeat the diagnosis from Step 1. If DTC is not displayed • 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. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.