KIA Niro: Engine Electrical System - Troubleshooting

Trouble Shooting

Ignition System

Symptom:

Vehicle indicates Ready in dash, but engine will not run when requested by the
HPCU (HEV module).

Suspect area → Remedy

Ignition coil → Inspect ignition coil, or replace as
required

Spark plugs → Inspect spark plugs, or replace as required

Ignition wiring disconnected or broken → Repair wiring, or replace as required

Symptom:

Rough idle

Suspect area → Remedy

Ignition wiring → Repair wiring, or replace as required

Ignition coil → Inspect ignition coil, or replace as
required

Symptom:

Engine hesitates/poor acceleration

Suspect area → Remedy

Spark plugs and spark plug cables →Inspect spark plugs / cable, or replace as required

Ignition wiring →Repair wiring, or replace as required

Symptom:

Poor mileage

Suspect area → Remedy

Spark plugs and spark plug cables → Inspect spark plugs / cable, or replace as required

Charging System

Symptom:

Charging warning
indicator does not
light with Start/Stop
Button "ON" and Hybrid System off.

Suspect area → Remedy

Fuse blown

Check fuses

Light burned out 

Replace light

Wiring connection
loose

Tighten loose connection

LDC problem

Check the LDC.

Refer to HC group

Symptom:

Charging warning
indicator does not
go out with Hybrid
System on. (Battery
requires frequent
recharging)

Suspect area → Remedy

Battery cable
loose, corroded or
worn

Inspect cable connection, repair or replace cable

LDC problem

Check the LDC.

Refer to HC group

Wiring

Repair or replace wiring

Symptom: 

Overcharge

Suspect area → Remedy

LDC problem

Check the LDC.

Refer to HC group

Voltage sensing
wire

Repair or replace wiring

Symptom: 

Discharge

Suspect area → Remedy

Wiring connection
loose or short
circuit

Inspect wiring connection, repair or replace wiring

LDC problem

Check the LDC.

Refer to HC group

Poor grounding

Inspect ground or repair

Worn battery

Replace battery

Abnormal
parasitic draw
from the vehicle

Install a current probe to measure current. It should be less than 0.05A (50mA) after Hybrid System off and waiting 10 minutes. Make sure trunk light is removed for this test.

Starting System

Symptom: 

Vehicle will not indicate Ready in dash at Hybrid System on.

Suspect area → Remedy

Auxiliary 12V battery charge low

Charge or replace auxiliary 12V battery

Auxiliary 12V battery cables loose, corroded or worn out

Repair or replace cables

Transaxle range switch
(Vehicle with automatic
transaxle only)

Refer to AT group-automatic transaxle

Fuse blown

Replace fuse

Ignition switch faulty

Replace

    READ NEXT:

     On-vehicle Inspection

    Warning Check that the auxiliary 12V battery cables are connected to the correct terminals. Disconnect the auxiliary 12V battery cables when the battery is given a quick charge. Never disconnect the auxiliary 12V battery while the engin

     Battery Voltage and Status

     Battery Terminal | Battery Condition

    Check the battery voltage and status using the battery tester. Battery Terminal Move back and forth to check that the battery terminals (A) are loose or corroded.If the terminals are corroded, clean them. If battery positive connect

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     Vehicle to load (V2L)

    V2L is the system that provides AC power using the high voltage battery for driving to operate several electronical products. A: Electric Vehicle EV Charge Transfer Select EV ? EV Charge Transfer on the screen. You can set the batt

     Cleaning

    Make sure the ignition switch and all accessories are in the OFF position. Remove the battery from the vehicle. (Refer to Charging System - "Battery") Warning Care should be taken in the event the battery case is cracked or

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