DTC U3003:16, U3003:17 [VEHICLE CONTROL MODULE (V/C-MODULE)]

id0102i0007500

System malfunction location	•  U3003:16: Vehicle control module (V/C-module) power supply voltage decreases •  U3003:17: Vehicle control module (V/C-module) power supply voltage increases
Detection condition	•  U3003:16: Vehicle control module (V/C-module) power supply voltage is 9 V or less during engine start. •  U3003:17: Vehicle control module (V/C-module) power supply voltage is 16.3 V or more.
Fail-safe	•  Inhibits the mazda radar cruise control (MRCC) system control •  Inhibits the smart brake support (SBS) system control •  Inhibits the distance recognition support system (DRSS) control
Possible cause	•  Generator system malfunction •  C/U IG1 15 A fuse malfunction •  Battery malfunction •  Vehicle control module (V/C-module) connector malfunction •  Open circuit or short to ground in wiring harness between battery positive terminal and vehicle control module (V/C-module) •  Vehicle control module (V/C-module) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM DTC INSPECTION FOR PCM •  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].) Then go to Step 5.
		No	Go to the next step.
2	INSPECT FUSE •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Remove the C/U IG1 15 A fuse. •  Is the fuse normal?	Yes	Install the C/U IG1 15 A fuse, then go to the next step.
		No	Replace the C/U IG1 15 A fuse, then go to Step 5.
3	INSPECT BATTERY •  Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-D 2.2].) (See BATTERY INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace/charge the battery, then go to Step 5. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
4	INSPECT WIRING HARNESS BETWEEN VEHICLE CONTROL MODULE (V/C-MODULE) AND IG1 RELAY •  Remove the front scuff plate (RH). (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.) •  Remove the front side trim (RH). (See FRONT SIDE TRIM REMOVAL/INSTALLATION.) •  Disconnect the vehicle control module (V/C-module) connector. (See VEHICLE CONTROL MODULE (V/C-MODULE) REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM].) •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Switch the ignition ON (engine off or on). •  Measure the voltage of vehicle control module (V/C-module) terminal A (wiring harness-side). Note •  Measure the voltage while shaking the wiring harness between the vehicle control module (V/C-module) and IG1 relay. •  Is the voltage between approx. 9—16.3 V?	Yes	Go to the next step.
		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between vehicle control module (V/C-module) terminal A and IG1 relay. •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit or short to ground. •  Repair or replace the malfunctioning part. •  Repair or replace the wiring harness which has an open circuit or short to ground. Go to the next step.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED •  Connect the vehicle control module (V/C-module) connector. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Clear vehicle control module (V/C-module) DTCs using the M-MDS. (See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)].) •  Switch the ignition ON (engine on). •  Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS. (See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)].) •  Is the same DTC present?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the vehicle control module (V/C-module). (See VEHICLE CONTROL MODULE (V/C-MODULE) REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM].) Go to the next step.
		No	Go to the next step.
6	VERIFY THAT NO OTHER DTCs ARE PRESENT •  Verify other DTCs displayed. •  Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
		No	DTC troubleshooting completed.