Description
Warning Lamps
Tread Lamp
| - |
Tire Under Inflation / Leak Warning.
|
|
1. |
Turn on condition
| A. |
When tire pressure is below allowed threshold.
|
| B. |
Indicates that tire needs to be re-inflated
to placard pressure / repaired.
|
|
|
2. |
Turn off condition
| A. |
Under-inflation ; When tire pressure is above
(warning threshold + hysteresis).
|
| B. |
Rapid Leak ; When tire pressure is above
(leak warning threshold).
|
|
|
TPMS warning can be light on because the tire pressure
declined by low temperature in the cold weather.
|
DTC Warning
|
1. |
Turn on condition
| A. |
When the system detects a fault that is external
to the receiver/ sensor.
|
| B. |
When the system detects a receiver fault.
|
| C. |
When the system detects a sensor fault.
|
| D. |
When the reciever connector is not connected
(only applicable to the vehicle with active circuit applied
to the instrument cluster)
|
|
|
2. |
Turn off condition
| A. |
If the fault is considered as 'critical',
then the lamp is held on throughout the current Ignition cycle
(even if the DTC has been demoted). This is because it is important
to bring the problem to the drivers attention. On the following
Ignition cycle, the demotion conditions will be re-checked.
If the demotion conditions occur, the lamp will be turned off.
It will be held on until DTC demotion checking is completed.
|
| B. |
'Non critical' faults are those that can
occur temporarily e.g. vehicle battery under voltage. The lamp
is therefore turned off when the DTC demotion condition occurs.
|
|
System Fault
|
1. |
General Function
| A. |
The system monitors a number of inputs across
time in order to determine that a fault exists.
|
| B. |
Faults are prioritized according to which
has the most likely cause.
|
| C. |
Certain faults are not covered through DTC.
The main ones are:
|
| 1) |
Control module Micro-controller lock
up ; requires observation of lamps at Ignition ON to
diagnose.
|
| 2) |
Ignition Line stuck ; requires observation
of lamps at Ignition ON to diagnose.
|
|
|
Schematic Diagram
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Hyundai Elantra HD: Description and Operation
