Grand Cherokee 4WD Laredo V8-4.7L (2002)
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.
System Faults
NOTE: The Remote Tire Pressure Monitor Sensors (RTPM) are not internally serviceable. For a Sensor Failure or Low Battery fault, the RTPM
must be replaced.
There are four conditions that 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 minutes at a vehicle speed above 40 Km/H (25 MPH),
it will:
a. Store an active fault code.
b. Request a chime.
c. Display "SERVICE TIRE PRESS SYSTEM".
d. Display a dashed line at the wheel location on the graphic display if the display is activated.
2.
When the EVIC detects:
-
A low pressure sensor/transmitter battery status for 7 consecutive ignition cycles,
-
Any sensor transmitting at a shorter than expected interval or,
-
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 "SERVICE TIRE PRESS SYSTEM".
Use the DRB III Input/Output function to further isolate the specific concern.
The DRB III 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 the Sensor/Transmitter is "awake" and transmitting as expected by the EVIC.
Spare Wheel Auto-Locate
If the spare tire is mounted on the vehicle, the EVIC will detect the relocation and determine from the sensor transmit intervals, which wheels are
mounted and which one is now the spare. The spare tire sensor/transmitter transmits once per hour. The sensor/transmitters in the mounted wheels
transmit once per minute when the vehicle is moving at 40 km/h (25 mph).
Remove Magnet From Spare
A magnet is used to initiate a sensor ID transmission. In the EVIC training procedure, the spare wheel is the last in the sequence. If the magnet is
left on the wheel, the sensor/transmitter will continue its ID transmission. If the EVIC detects 20 transmissions from the spare wheel in 60 seconds
and the vehicle speed is above 40 km/h (25 mph), it will:
-
Request a chime.
-
Display "REMOVE MAGNET FROM SPARE" for 60 seconds per ignition-ON cycle.
Tire Pressure Unavailable
The EVIC can detect high radio noise interference. When the noise level is too high to distinguish a transmission from a sensor/transmitter, it will:
-
Display "TIRE PRESSURE UNAVAILABLE" for 5 seconds.
-
Request a chime.
-
Switch to the graphic display and show dashed lines instead of the tire pressure for the wheel(s) affected by the radio interference.
Tire Pressure Now Available
If the "TIRE PRESSURE UNAVAILABLE" message was displayed because of radio noise interference, the EVIC will:
-
Display "TIRE PRESSURE NOW AVAILABLE" for 5 seconds.
-
Request a chime.
When the noise level no longer interferes with sensor/transmitter transmissions.
Part 3A
EXTERIOR LIGHTING SYSTEM
