DTC U3003:16, U3003:17 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2731000

System malfunction location

•  U3003:16: Climate control unit power supply circuit voltage below threshold (B+, IG1) (10 V or less)

•  U3003:17: Climate control unit power supply circuit voltage above threshold (B+, IG1) (17.3 V or more)

Detection condition

•  Climate control unit power supply voltage is other than 10.1—17.2 V

Fail-safe

—

Possible cause

•  Generator system malfunction

•  ROOM 15 A fuse malfunction

•  C/U IG1 15 A fuse malfunction

•  Battery malfunction

•  Climate control unit connector malfunction

•  Open or short circuit to ground in wiring harness between battery positive terminal and climate control unit

•  Climate control unit malfunction

System malfunction location	• U3003:16: Climate control unit power supply circuit voltage below threshold (B+, IG1) (10 V or less) • U3003:17: Climate control unit power supply circuit voltage above threshold (B+, IG1) (17.3 V or more)
Detection condition	• Climate control unit power supply voltage is other than 10.1—17.2 V
Fail-safe	—
Possible cause	• Generator system malfunction • ROOM 15 A fuse malfunction • C/U IG1 15 A fuse malfunction • Battery malfunction • Climate control unit connector malfunction • Open or short circuit to ground in wiring harness between battery positive terminal and climate control unit • Climate control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT PCM DTC (INSPECT GENERATOR CIRCUIT)

•  Switch the ignition off.

•  Connect the M-MDS to the DLC-2.

•  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

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-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

•  Remove the following fuses.

―  ROOM 15 A fuse

―  C/U IG1 15 A fuse

•  Is the fuse normal?

Yes

Install the fuse, then go to the next step.

No

Replace the malfunctioning fuse, then go to Step 8.

3

INSPECT BATTERY

•  Inspect the battery.
(See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].)

•  Is the battery normal?

Yes

Go to the next step.

No

Replace/charge the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)(See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].)

Then go to Step 8.

4

INSPECT CLIMATE CONTROL UNIT

•  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

•  Switch the ignition ON (engine off or on).

•  Inspect the climate control unit terminal 1A.

•  Is voltage normal?

Yes

The system is normal at present.

Go to the step 8.

No

Go to the next step.

5

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

•  Disconnect the climate control unit connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to the next step.

6

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND

•  Disconnect the climate control unit connector.

•  Inspect for continuity between climate control unit terminal 1A and body ground.

•  Is there continuity?

Yes

Repair the wiring harness, then go to Step 8.

No

Go to the next step.

7

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

•  Inspect for continuity between climate control unit terminal 1A and battery positive terminal.

•  Is there continuity?

Yes

Go to the next step.

No

Repair the wiring harness, then go to the next step.

8

INSPECT CLIMATE CONTROL UNIT

•  Reconnect the disconnected connectors.

•  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

•  Clear DTCs using the M-MDS.

•  Perform the climate control unit DTC inspection using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Are DTCs U3003:16 or U3003:17 displayed?

Yes

Repeat the inspection from Step 1.

•  If the malfunction does not recur, go to the next step.

•  If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

9

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.

STEP	INSPECTION		ACTION
1	INSPECT PCM DTC (INSPECT GENERATOR CIRCUIT) • Switch the ignition off. • Connect the M-MDS to the DLC-2. • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
1		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-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Remove the following fuses. ― ROOM 15 A fuse ― C/U IG1 15 A fuse • Is the fuse normal?	Yes	Install the fuse, then go to the next step.
2		No	Replace the malfunctioning fuse, then go to Step 8.
3	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].) • Is the battery normal?	Yes	Go to the next step.
3		No	Replace/charge the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)(See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].) Then go to Step 8.
4	INSPECT CLIMATE CONTROL UNIT • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Switch the ignition ON (engine off or on). • Inspect the climate control unit terminal 1A. • Is voltage normal?	Yes	The system is normal at present. Go to the step 8.
4		No	Go to the next step.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the climate control unit connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
5		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
6	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND • Disconnect the climate control unit connector. • Inspect for continuity between climate control unit terminal 1A and body ground. • Is there continuity?	Yes	Repair the wiring harness, then go to Step 8.
6		No	Go to the next step.
7	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between climate control unit terminal 1A and battery positive terminal. • Is there continuity?	Yes	Go to the next step.
7		No	Repair the wiring harness, then go to the next step.
8	INSPECT CLIMATE CONTROL UNIT • Reconnect the disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear DTCs using the M-MDS. • Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Are DTCs U3003:16 or U3003:17 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction does not recur, go to the next step. • If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
8		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
9		No	DTC troubleshooting completed.