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DTC U3000:49 [VEHICLE CONTROL MODULE (E)]

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Outline

System malfunction location

Vehicle control module (VCM) internal malfunction

Detection condition

•  The vehicle control module (VCM) detects any of the following malfunctions for 10 s.

―  Vehicle control module (VCM) internal malfunction

―  Power supply circuit malfunction

Fail-safe

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

Possible cause

•  Short to ground or open circuit in vehicle control module (VCM) power supply circuit

•  Open circuit in vehicle control module (VCM) ground circuit

•  Vehicle control module (VCM) malfunction (built into body control module (BCM))

System malfunction location	Vehicle control module (VCM) internal malfunction
Detection condition	• The vehicle control module (VCM) detects any of the following malfunctions for 10 s. ― Vehicle control module (VCM) internal malfunction ― Power supply circuit malfunction
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)
Possible cause	• Short to ground or open circuit in vehicle control module (VCM) power supply circuit • Open circuit in vehicle control module (VCM) ground circuit • Vehicle control module (VCM) malfunction (built into body control module (BCM))

*1 :With i-stop system and without Mazda M Hybrid

*2 :Without i-stop system or with Mazda M Hybrid

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT VEHICLE CONTROL MODULE (VCM) POWER SUPPLY VOLTAGE

•  Reconnect all the disconnected connectors.

•  Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

•  Measure the voltage at the following terminals.

―  Body control module (BCM) terminal 1A

―  Body control module (BCM) terminal 1B

―  Body control module (BCM) terminal 1D

―  Body control module (BCM) terminal 4W

―  Body control module (BCM) terminal 1C

•  Is the voltage within the standard?
(See BODY CONTROL MODULE (BCM) INSPECTION [(E)].)

Yes

Go to Step 3.

No

Go to the next step.

2

INSPECT VEHICLE CONTROL MODULE (VCM) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the applicable circuit for a short to ground and an 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.

3

INSPECT VEHICLE CONTROL MODULE (VCM) GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an 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.

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 vehicle control module (VCM).
(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 body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS 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.

Step	Inspection	Results	Action
1	INSPECT VEHICLE CONTROL MODULE (VCM) POWER SUPPLY VOLTAGE • Reconnect all the disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Measure the voltage at the following terminals. ― Body control module (BCM) terminal 1A ― Body control module (BCM) terminal 1B ― Body control module (BCM) terminal 1D ― Body control module (BCM) terminal 4W ― Body control module (BCM) terminal 1C • Is the voltage within the standard? (See BODY CONTROL MODULE (BCM) INSPECTION [(E)].)	Yes	Go to Step 3.
1		No	Go to the next step.
2	INSPECT VEHICLE CONTROL MODULE (VCM) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the applicable circuit for a short to ground and an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT VEHICLE CONTROL MODULE (VCM) GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
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 vehicle control module (VCM). (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 body control module (BCM), then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.