02–
19
02
5. Load test
Malfunction occurs only when electrical device is turned
on. Turn on the electrical equipment (A/C, rear window
defogger, radio, fog light, etc.) one by one and determine
the relationship between electrical equipment and
malfunction. Confirm the malfunction by a load test.
6. Cold/hot start test
Some malfunctions occur in cold start and disappear when engine warms up. In this case, park vehicle
without operation for a whole night and restart it the next day. Perform test and determine the cause
quickly.
7. Voltage drop test
Generally, the voltage drop test is used to find out the possible causes that affect the normal function of
electrical components or circuits.
Check the circuit with a digital multimeter.
If resistance of single wire harness measured by a digital multimeter is very low (0 Ω or close to 0 Ω), the
wire harness or circuit is normal.
The unnecessary resistance in circuit may be caused by poor, loose grounding, corrosive switch contact
and loose wire connector or adapter.
Precautions for Control Module and Electrical Components
Inspection
Before performing electrical operations, turn ignition
switch to LOCK and disconnect the negative battery
cable, then wait for 2 minutes until the backup power
supply of airbag module is depleted (w/ airbag system).
Disconnecting the battery cable will delete the clock, audio and DTC records. Therefore, it is necessary to
confirm these records before disconnecting the cable.
Never connect the electrodes of battery terminals reversely.
Only install components that meet the vehicle specifications.
1. Inspect input and output conditions of components and their functions before replacing control module.
When disconnecting components:
- Do not use excessive force when disconnecting connector.
- If connector is installed by tightening bolt, loosen mounting bolt and then disconnect the connector
by hand.
When connecting components:
- Make sure that terminals are not bent or damaged, and then connect it correctly before installing
connector.
RT21020190
RT21020200