Manual pages - MX5 Manual | Mazda MX5 (Mk4) 2015+

Knowledge Base

Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

< Previous Next >

DTC U3003:16 [AUDIO AMPLIFIER]

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 CABIN+B 50 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 2.0)].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		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.
		No	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
3	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.0].) Is the generator normal?	Yes	Go to the next step.
		No	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
4	INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE 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.
		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 cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Measure the voltage at audio amplifier terminal 3A (wiring harness-side). Is the voltage B+?	Yes	Go to the next step.
		No	Inspect the AUDIO1 25 A fuse, CABIN+B 50 A fuse, and MAIN 200 A fuse. Any fuse is blown: Refer to the wiring diagram and verify if there is a common connector between MAIN 200 A fuse and audio amplifier 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 if 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 cable. (See NEGATIVE BATTERY CABLE 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.
		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].)
		No	DTC troubleshooting completed.

< Previous Next >

This fan site is not affiliated with Mazda, and is intended for personal, or commercial use only. The content of our web pages is for general information purposes only and is presented “as is”. We give no assurance or warranty regarding the accuracy of the contents. Readers should do their due diligence and seek the advice of an appropriately certified automotive technician before attempting any steps on this site. Original content provided by Mazda North America. The content of the manual is copyright under DMCA to: full.metal.resistor@gmail.com

We accept no responsibility for errors, inaccuracies, or omissions found on these pages. Additionally, we hereby exclude liability for any demands, claims, damages or losses of any kind with regard to any content or information provided on our web-site, including but not limited to incidental or consequential damages, direct or indirect loss, compensatory damages, loss of profits, or otherwise. By using this manual you assume full liablity for any procedures carried out on your vehicle, and are responsible for the vehicle remaining road legal and safe.