Diagnostic Procedure

WARNING: This page is about a different car, the 2024 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DTC U3003:16 (POWER LIFTGATE CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY PCM DTCs Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] .) (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN L)] .) (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN M)] .) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (VIN Y)] .) (See DTC TABLE [PCM (VIN L)] .) (See DTC TABLE [PCM (VIN M)] .)
1		No	Go to the next step.
2	VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs Retrieve the rear body control module (RBCM) DTCs using the M-MDS. (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)] .) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)] .)
2		No	Go to the next step.
3	INSPECT BATTERY Inspect the battery. (See BATTERY INSPECTION .) Is the battery normal?	Yes	Go to the next step.
3		No	Recharge or replace the battery, then go to Step 10. (See BATTERY RECHARGING .) (See BATTERY REMOVAL/INSTALLATION [VIN Y] .) (See BATTERY REMOVAL/INSTALLATION [VIN L] .) (See BATTERY REMOVAL/INSTALLATION [VIN M] .)
4	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [VIN Y] .) (See GENERATOR INSPECTION [VIN L] .) (See GENERATOR INSPECTION [VIN M] .) Is the generator normal?	Yes	Go to the next step.
4		No	Replace the generator, then go to Step 10. (See GENERATOR REMOVAL/INSTALLATION [VIN Y] .) (See GENERATOR REMOVAL/INSTALLATION [VIN L] .) (See GENERATOR REMOVAL/INSTALLATION [VIN M] .)
5	INSPECT POWER LIFTGATE (PLG) CONTROL MODULE CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the power liftgate (PLG) control module 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.
5		No	Repair or replace the connector, then go to Step 6.
6	VERIFY POWER LIFTGATE (PLG) CONTROL MODULE POWER SUPPLY VOLTAGE Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Measure the voltage at the following terminals (wiring harness-side): Power liftgate (PLG) control module terminal 1AD Power liftgate (PLG) control module terminal 2I Is the voltage B+?	Yes	Go to the next step.
6		No	Inspect the C/U IG1 15 A fuse, PLG 20 A fuse and CABIN.+B 50 A fuse. Any fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: C/U IG1 15 A fuse-Power liftgate (PLG) control module terminal 1AD MAIN 200 A fuse-Power liftgate (PLG) control module terminal 2I If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short 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 the following terminals: IG1 relay-Power liftgate (PLG) control module terminal 1AD Battery positive terminal-Power liftgate (PLG) control module terminal 2I If there is a common connector: 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. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 10.
7	INSPECT REAR BODY CONTROL MODULE CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the rear body control module 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.
7		No	Repair or replace the connector, then go to Step 10.
8	INSPECT POWER LIFTGATE (PLG) CONTROL MODULE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND Verify that the rear body control module (RBCM) terminal and power liftgate (PLG) control module connectors are disconnected. Inspect for continuity between rear body control module (RBCM) terminal 4F (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between rear body control module (RBCM) terminal 4F and power liftgate (PLG) control module terminal 1AA. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to Step 10.
8		No	Go to the next step.
9	INSPECT POWER LIFTGATE (PLG) CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Verify that the rear body control module (RBCM) terminal and power liftgate (PLG) control module connectors are disconnected. Inspect for continuity between rear body control module (RBCM) terminal 4F (wiring harness-side) and power liftgate (PLG) control module terminal 1AA (wiring harness-side). Is there continuity?	Yes	Go to the next step.
9		No	Refer to the wiring diagram and verify whether or not there is a common connector between rear body control module (RBCM) terminal 4F and power liftgate (PLG) control module terminal 1AA. If there is a common connector: 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. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to the next step.
10	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 power liftgate (PLG) control module using the M-MDS. (See CLEARING DTC [POWER LIFTGATE (PLG) CONTROL MODULE] .) Retrieve the power liftgate (PLG) control module DTCs using the M-MDS. (See DTC INSPECTION [POWER LIFTGATE (PLG) CONTROL MODULE] .) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the power liftgate (PLG) control module. (See POWER LIFTGATE (PLG) CONTROL MODULE REMOVAL/INSTALLATION .) Go to the next step.
10		No	Go to the next step.
11	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 [POWER LIFTGATE (PLG) CONTROL MODULE] .)
11		No	DTC troubleshooting completed.