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 (10 V or less)

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

Detection condition

•  Climate control unit power supply voltage is other than 10—17.3 V

Fail-safe function

Not applicable

Possible cause

•  Generator system malfunction

•  INTERIOR 15 A, ROOM 25 A fuse malfunction

•  Battery malfunction (without i-ELOOP)

•  DC-DC converter malfunction (with i-ELOOP)

•  Climate control unit connector malfunction

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

•  Climate control unit malfunction

System malfunction location	• U3003:16: Climate control unit power supply circuit voltage below threshold (10 V or less) • U3003:17: Climate control unit power supply circuit voltage above threshold (17.3 V or more)
Detection condition	• Climate control unit power supply voltage is other than 10—17.3 V
Fail-safe function	Not applicable
Possible cause	• Generator system malfunction • INTERIOR 15 A, ROOM 25 A fuse malfunction • Battery malfunction (without i-ELOOP) • DC-DC converter malfunction (with i-ELOOP) • Climate control unit connector malfunction • Open or short circuit to ground in wiring harness between battery positive terminal and climate control unit terminal • 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 [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)

No

With i-ELOOP

•  Go to the next step.

Without i-ELOOP

•  Go to step 6.

2

VERIFY PCM DTCs

•  Retrieve the PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 1.5, 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 1.5, SKYACTIV-G 2.0)].)

No

Go to the next step.

3

VERIFY DC-DC CONVERTER (i-ELOOP) DTCs

•  Retrieve the DC-DC converter (i-ELOOP) DTCs using the M-MDS.
(See DTC INSPECTION [i-ELOOP].)

•  Are any DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [i-ELOOP].)

No

Go to the next step.

4

INSPECT DC-DC CONVERTER (i-ELOOP)

•  Inspect the DC-DC converter (i-ELOOP).
(See DC-DC CONVERTER (i-ELOOP) INSPECTION [i-ELOOP].)

•  Is the DC-DC converter (i-ELOOP) normal?

Yes

Go to the next step.

No

Replace the DC-DC converter (i-ELOOP), then go to the next step.

(See DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].)

5

INSPECT FUSE

•  Switch the ignition off.

•  Disconnect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Remove the ROOM 25 A fuse and INTERIOR 15 A fuse.

•  Are the fuses normal?

Yes

Install the ROOM 25 A fuse and INTERIOR 15 A fuse, then go to step 7.

No

Replace the ROOM 25 A fuse and/or INTERIOR 15 A fuse, then go to step 7.

6

INSPECT BATTERY

•  Inspect the battery.
(See BATTERY INSPECTION.)

•  Is the battery normal?

Yes

Go to the next step.

No

Replace or charge the battery.

(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)

(See BATTERY RECHARGING.)

Then go to the next step.

7

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Disconnect the climate control unit connector.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

•  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.

8

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

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

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal L and battery positive terminal.

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.

No

Go to the next step.

9

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

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

•  Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal L and battery positive terminal.

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

INSPECT CLIMATE CONTROL UNIT

•  Reconnect the disconnected connectors.

•  Connect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  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.

11

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

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 [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
1		No	With i-ELOOP • Go to the next step. Without i-ELOOP • Go to step 6.
2	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 1.5, 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 1.5, SKYACTIV-G 2.0)].)
2		No	Go to the next step.
3	VERIFY DC-DC CONVERTER (i-ELOOP) DTCs • Retrieve the DC-DC converter (i-ELOOP) DTCs using the M-MDS. (See DTC INSPECTION [i-ELOOP].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [i-ELOOP].)
3		No	Go to the next step.
4	INSPECT DC-DC CONVERTER (i-ELOOP) • Inspect the DC-DC converter (i-ELOOP). (See DC-DC CONVERTER (i-ELOOP) INSPECTION [i-ELOOP].) • Is the DC-DC converter (i-ELOOP) normal?	Yes	Go to the next step.
4		No	Replace the DC-DC converter (i-ELOOP), then go to the next step. (See DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].)
5	INSPECT FUSE • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Remove the ROOM 25 A fuse and INTERIOR 15 A fuse. • Are the fuses normal?	Yes	Install the ROOM 25 A fuse and INTERIOR 15 A fuse, then go to step 7.
5		No	Replace the ROOM 25 A fuse and/or INTERIOR 15 A fuse, then go to step 7.
6	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION.) • Is the battery normal?	Yes	Go to the next step.
6		No	Replace or charge the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].) (See BATTERY RECHARGING.) Then go to the next step.
7	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
7		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
8	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between climate control unit terminal L and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal L and battery positive terminal. 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 CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between climate control unit terminal L and battery positive terminal. • 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 climate control unit terminal L and battery positive terminal. 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	INSPECT CLIMATE CONTROL UNIT • Reconnect the disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear DTCs using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • 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.
10		No	Go to the next step.
11	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
11		No	DTC troubleshooting completed.