DTC U3003:16 [AUDIO AMPLIFIER] - MAZDA CX-9 TC 2016

DTC U3003:16 [AUDIO AMPLIFIER]

id0902f8848900

Without i-stop System

Description	Audio amplifier low power supply voltage input
Detection condition	• Audio amplifier power supply circuit voltage of 9.0 ± 0.8 V or less is detected for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the PCM. • Battery malfunction • Generator malfunction • Audio amplifier connector or terminal malfunction • Audio amplifier power supply circuit malfunction ? Short to ground in the wiring harness between MAIN 200 A fuse and audio amplifier terminal 3A ? AUDIO1 25 A fuse malfunction ? AUDIO 40 A fuse malfunction ? MAIN 200 A fuse malfunction ? Open circuit in wiring harness between battery positive terminal and audio amplifier terminal 3A • Audio amplifier malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION.) • Is the battery normal?	Yes	Go to the next step.
2		No	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION.)
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) • Is the generator normal?	Yes	Go to the next step.
3		No	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].)
4	INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the audio amplifier connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to Step 6.
5	VERIFY AUDIO AMPLIFIER POWER SUPPLY VOLTAGE • Verify that the audio amplifier connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the audio amplifier terminal 3A (wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the AUDIO1 25 A fuse, AUDIO 40 A fuse and MAIN 200 A fuse. • Any fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to ground. • Replace the fuse. • Any fuse is damaged: ? Replace the fuse. • All fuses are normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to the next step.
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the audio amplifier using the M-MDS. (See CLEARING DTC [AUDIO AMPLIFIER].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the audio amplifier DTCs using the M-MDS. (See DTC INSPECTION [AUDIO AMPLIFIER].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.) Go to the next step.
6		No	Go to the next step.
7	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO AMPLIFIER].)
7		No	DTC troubleshooting completed.

Without i-ELOOP, with i-stop System

Description	Audio amplifier low power supply voltage input
Detection condition	• Audio amplifier power supply circuit voltage of 9.0 ± 0.8 V or less is detected for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the PCM. • Audio amplifier connector or terminal malfunction • Audio amplifier power supply circuit malfunction ? Short to ground in the wiring harness between AUDIO1 25 A fuse and audio amplifier terminal 3A ? AUDIO1 25 A fuse malfunction ? Open circuit in wiring harness between DC-DC converter terminal K and audio amplifier terminal 3A • DC-DC converter connector terminal malfunction • DC-DC converter malfunction • Audio amplifier malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
1		No	Go to the next step.
2	INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the audio amplifier connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 6.
3	VERIFY AUDIO AMPLIFIER POWER SUPPLY VOLTAGE • Verify that the audio amplifier connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the audio amplifier terminal 3A (wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
3		No	Inspect the AUDIO1 25 A fuse. • If the fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between AUDIO1 25 A fuse and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to ground. • Replace the fuse. • If the fuse is damaged: ? Replace the fuse. • If the fuse is normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal K and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit.
4	INSPECT DC-DC CONVERTER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the DC-DC converter connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to Step 6.
5	INSPECT DC-DC CONVERTER • Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) • Is there any malfunctioning part?	Yes	Repair or replace the DC-DC converter and go to the next step. (See DC-DC CONVERTER REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].)
5		No	Go to the next step.
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the audio amplifier using the M-MDS. (See CLEARING DTC [AUDIO AMPLIFIER].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the audio amplifier DTCs using the M-MDS. (See DTC INSPECTION [AUDIO AMPLIFIER].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.) Go to the next step.
6		No	Go to the next step.
7	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO AMPLIFIER].)
7		No	DTC troubleshooting completed.

With i-ELOOP, With i-stop System

Description	Audio amplifier low power supply voltage input
Detection condition	• Audio amplifier power supply circuit voltage of 9.0 ± 0.8 V or less is detected for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the PCM. • DTCs are stored in the DC-DC converter (i-ELOOP). • Audio amplifier connector or terminal malfunction • Audio amplifier power supply circuit malfunction ? Short to ground in the wiring harness between AUDIO1 25 A fuse and audio amplifier terminal 3A ? AUDIO1 25 A fuse malfunction ? Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 4A and audio amplifier terminal 3A • Audio amplifier malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
1		No	Go to the next step.
2	VERIFY DC-DC CONVERTER (i-ELOOP) DTCs • Retrieve the DC-DC converter (i-ELOOP) DTCs using the M-MDS. (See DTC INSPECTION [i-ELOOP].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [i-ELOOP].)
2		No	Go to the next step.
3	INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the audio amplifier connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 5.
4	VERIFY AUDIO AMPLIFIER POWER SUPPLY VOLTAGE • Verify that the audio amplifier connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the audio amplifier terminal 3A (wiring harness side). • Is the voltage B+?	Yes	Go to the next step.
4		No	Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Inspect the AUDIO1 25 A fuse. • If the fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between AUDIO1 25 A fuse and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to ground. • Replace the fuse. • If the fuse is damaged: ? Replace the fuse. • If the fuse is normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter (i-ELOOP) terminal 4A and audio amplifier terminal 3A. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Connect the service plug, then go to the next step. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the audio amplifier using the M-MDS. (See CLEARING DTC [AUDIO AMPLIFIER].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the audio amplifier DTCs using the M-MDS. (See DTC INSPECTION [AUDIO AMPLIFIER].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.) Go to the next step.
5		No	Go to the next step.
6	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO AMPLIFIER].)
6		No	DTC troubleshooting completed.