Grand Cherokee 4WD V8-4.7L (2003)
The EVIC will monitor the tire pressure signals from the four (or five) tire sensors and determine if any tire has gone below the low pressure threshold
or raised above the high pressure threshold. Refer to the table.
CRITICAL AND NON-CRITICAL PRESSURE ALERTS
A critical alert will be triggered when a tire pressure has gone below or above a set threshold pressure. Depending on what the condition is, the EVIC
will request a chime and then display a LOW PRESSURE or HIGH PRESSURE message indicating the appropriate location.
The alert message will display for three seconds and then switch to the tire pressure trip screen. The tire pressure for the tire that has exceeded its
threshold will blink at one second intervals on the graphic display. The blinking pressure will continue for the rest of the ignition cycle or until an
EVIC button is pressed. If the display is removed without correcting the condition, it will reappear without a chime after 60 seconds to warn the drive
of the low/high pressure condition.
A non-critical alert will be triggered when low or high pressure threshold has been exceeded in the spare tire. The "SPARE LOW PRESSURE" or
"SPARE HIGH PRESSURE" alert will be displayed for 60 seconds during each ignition ON cycle. If the pressure threshold is exceeded while the
ignition is OFF, the alert will be delayed 8-10 seconds after ignition ON.
NOTE: The spare tire is only monitored when equipped with the 5-Tire TPM System.
SYSTEM FAULTS
NOTE: The Remote Tire Pressure Monitors (RTPM) are not internally serviceable. For a Sensor Failure or Low Battery fault, the RTPM must be
replaced.
There are four conditions which will cause a Tire Pressure Monitoring System fault to be set. All fault codes are associated with a specific wheel
location.
1. If the EVIC detects a non-transmitting Sensor/Transmitter in a road wheel for 10 consecutive minutes with vehicle speed above 25 mph (40 kph)
, it will:
a. Store an active fault code.
b. Request a chime.
c. Display "TIRE SENSOR BAD / MISSING".
d. Display a dashed line at the wheel location on the graphic display if the display is activated.
When the EVIC detects:
2. A low pressure sensor battery status,
3. All five sensors transmitting at a shorter than expected interval or,
4. No valid pressure sensor ID from the spare tire for 20 consecutive ignition cycles spaced at least one hour apart, it will:
a. Store an active fault code.
b. Request a chime.
c. Display "TIRE SENSOR BAD / MISSING".
Use the DRBIII Input/Output function to further isolate the specific concern.
The DRBIII can be queried to determine the Sensor/Transmitter status:
-
"Invalid Pressure" - The Sensor/Transmitter is reporting a negative pressure or a pressure above 434 kPa (63 psi).
-
"Low Batt" - The Sensor/Transmitter has reported a low battery status for seven consecutive ignition cycles.
-
"Trained" - The Sensor/Transmitter ID code is recognized by the EVIC.
-
"Active" The vehicle is moving at 40 km/h (25 mph) and/or the Sensor/Transmitter is "awake" and transmitting as expected by the EVIC.
SPARE WHEEL AUTO-LOCATE (5-TIRE TPM SYSTEM ONLY)
If the spare tire is mounted on the vehicle, the EVIC will detect the move and determine from the sensor transmit intervals, which wheels are mounted
