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 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
SEE MORE:
Battery conditioning mode (if equipped)
A: EV Settings
Battery conditioning mode
Battery conditioning mode
The Battery conditioning mode is efficient
during the winter time when the
high voltage battery temperature is
low. This mode is recommended to
improve driving
Air Cleaner Repair procedures
Removal and
Installation
Air Cleaner Assembly
Disconnect the air duct B (A).
Tightening torque :
2.9 - 4.9 N*m (0.3 - 0.5 kgf*m, 2.2 - 3.6 lb*ft)
Disconnect the mass air flow sensor (MAFS) connector (A) and breather
hose (B).
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