Diagnostic Procedure

WARNING: This page is about a different car, the 2021 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DTC U300A:62 (POWER LIFTGATE CONTROL MODULE) DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT IG1 RELAY Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Remove the IG1 relay. (See RELAY LOCATION .) Inspect the IG1 relay. (See RELAY INSPECTION .) Is the IG1 relay normal?	Yes	Go to the next step.
1		No	Replace the IG1 relay, then Go to Step 8. (See RELAY LOCATION .)
2	INSPECT IG1 RELAY CIRCUIT FOR SHORT TO GROUND Verify that the IG1 relay is removed. Inspect for continuity between IG1 relay terminal D (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 MAIN 200 A fuse and IG1 relay terminal D. 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. Go to Step 8.
2		No	Go to the next step.
3	INSPECT IG1 RELAY CIRCUIT FOR OPEN CIRCUIT Verify that the IG1 relay is removed. Inspect for continuity between battery positive terminal and IG1 relay terminal D (wiring harness-side). Is there continuity?	Yes	Go to the next step.
3		No	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and IG1 relay terminal D. 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 8.
4	INSPECT POWER LIFTGATE (PLG) CONTROL MODULE CONNECTOR CONDITION 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.
4		No	Repair or replace the connector, then Go to Step 8.
5	INSPECT IG1 RELAY CIRCUIT FOR SHORT TO GROUND Verify that the IG1 relay is removed. Verify that the power liftgate (PLG) control module connector is disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: IG1 relay terminal C Power liftgate (PLG) control module terminal 1AD Is there continuity?	Yes	Inspect the C/U IG1 15 A fuse. If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and power liftgate (PLG) control module terminal 1AD. 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. 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 IG1 relay terminal C and C/U IG1 15 A fuse. 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 8.
5		No	Go to the next step.
6	INSPECT IG1 RELAY CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the IG1 relay is removed. Verify that the power liftgate (PLG) control module 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 power liftgate (PLG) control module terminal 1AD (wiring harness-side). Is the voltage 0 V?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and power liftgate (PLG) control module terminal 1AD. 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 power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
7	INSPECT IG1 RELAY CIRCUIT FOR OPEN CIRCUIT Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Verify that the IG1 relay is removed. Verify that the power liftgate (PLG) control module connector is disconnected. Inspect for continuity between IG1 relay terminal C (wiring harness-side) and power liftgate (PLG) control module terminal 1AD (wiring harness-side). Is there continuity?	Yes	Go to the next step.
7		No	Inspect the C/U IG1 15 A 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 IG1 relay terminal C and power liftgate (PLG) control module terminal 1AD. 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.
8	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] .) Switch the ignition off and wait for 1 s or more. Switch the ignition ON (engine off or on) and wait for 1 s or more. 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.
8		No	Go to the next step.
9	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] .)
9		No	DTC troubleshooting completed.