Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSKIA2021FORTE GT, AUTOMATIC DCT TRANSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESINTEGRATED CENTRAL CONTROL UNIT DIAGNOSISDTC B1644-00: CAN TIME-OUT ACUWIRING INSPECTIONCIRCUIT INSPECTION

2021 Kia Forte GT, Automatic DCT Trans

Circuit Inspection

2021 Kia Forte GT, Automatic DCT TransSECTION Circuit Inspection

Courtesy of KIA MOTORS AMERICA, INC.

Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "OFF". Disconnect the electrical connector(s) from the concerned component. Ignition "ON".	ACU connector	1, 19 (power)	Chassis ground	-	B+
Ignition "OFF". Disconnect auxiliary battery (-) cable. Disconnect the electrical connector(s) from the concerned component.	ACU connector	1 (ground)	Chassis ground	-	below 1Ω

Good

Go to "CAN Inspection" procedure.

No Good

Repair open or short in circuit and then go to "VERIFICATION OF REPAIR " procedure.

CAN Inspection
Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "ON".	ICU connector	12 (P-CAN high)	Chassis ground	-	Fig.1
Ignition "ON".	ICU connector	11 (P-CAN low)	Chassis ground	-	Fig.1

Courtesy of KIA MOTORS AMERICA, INC.

Good

Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Repair or replace as necessary and go to "VERIFICATION OF REPAIR " procedure.

No Good

Go to "CAN Communication Line Inspection" procedure.

CAN Communication Line Inspection
Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "OFF". Disconnect auxiliary battery (-) cable. Disconnect the electrical connector(s) from the concerned component and ICU.	ICU connector	12 (P-CAN high)	ICU connector	11 (P-CAN low)	Approx. 60Ω
	ACU connector	17 (P-CAN high)	ACU connector	18 (P-CAN low)	Approx. 60Ω
	ICU (component side)	12 (P-CAN high)	ICU (component side)	11 (P-CAN low)	Approx. 120Ω
	ECM/PCM (component side)	77 (P-CAN high)	ECM/PCM (component side)	60 (P-CAN low)	Approx. 120Ω
	ICU connector	12 (P-CAN high)	ACU connector	17 (P-CAN high)	below 1Ω
	ICU connector	11 (P-CAN low)	ACU connector	18 (P-CAN low)	below 1Ω

Good

Go to "COMPONENT INSPECTION " procedure.

No Good

Repair open or short in circuit and then go to "VERIFICATION OF REPAIR " procedure.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.