Circuit Inspection

Fig 1: ECM System Circuit

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: ECM Connector Terminals

Courtesy of KIA MOTORS AMERICA, INC.

INSPECTION PART - IBAU AND HPCU CONNECTOR INSPECTION

Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "ON".	IBAU connector	19 (P-CAN high)	Chassis ground	-	Fig.1
Ignition "ON".	IBAU connector	20 (P-CAN low)	Chassis ground	-	Fig.1
Ignition "OFF". Disconnect battery (-) cable. Disconnect the electrical connector(s) from the concerned component.	IBAU connector	19 (P-CAN high)	HPCU connector	78 (P-CAN high)	Approx. below 1Ω
	IBAU connector	20 (P-CAN low)	HPCU connector	79 (P-CAN low)	Approx. below 1Ω

Fig 3: Screen Display - Normal P-CAN Signal Waveform

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	Repair open or short in circuit and then go to "VERIFICATION OF REPAIR " procedure. If no problems were found with the circuits or connectors, go to "COMPONENT INSPECTION " procedure.