N092 TYRE PRESSURE MONITORING NOT WORKING - Fiat - NUOVA BRAVO - eLearn

198001898 - N092 TYRE PRESSURE MONITORING NOT WORKING

The following message appears on the control panel display: tyre pressure monitoring not available and the general failure warning light comes onThe tyre pressure control unit (CPP) acquires information on the status of all four tyres via radio signals from the sensors. At the key on the sensors are interrogated through energizing by activators each in a control unit with an internal aerial. There is an activator/aerial for each of the 4 wheels. The CPP communicates with the NBC on the A-BUS serial line.The fault signals in the control panel are not memorized when the engine is switched off and then started up again. In order to be able to display any failure messages sent by the control unit, the vehicle must be moving for a short period

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
		TEST RESULTS
	Visually inspect that all the tyres are fitted with pressure sensors.Check that the pressure sensor has not been damaged through incorrect installtionCheck that the tyre is not visibly damaged by overheatingCheck that the pressure sensor is not transmitting a temperature inside the tyre that is too high (above 110°C)	Move on to Step 1	1. Tyre does not have a pressure sensor2. Pressure sensor damaged3. Tyre damaged by high temperature (above 110°C)	1. Replace the tyre with one which has a pressure sensor2. Replace pressure sensor3.Replace the tyre if damaged, or else replace the pressure sensor Op. 4450B92 FRONT TYRES PRESSURE TRANSMITTER, (ONE) LH OR RH - R R Op. 4450B93 REAR TYRES PRESSURE TRANSMITTER, (ONE) LH OR RH - R R
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check by connecting the Examiner to the tyre pressure monitoring control unit that there are no errorsCheck that the sensor initialization procedure has been successful	End of diagnosis	1. Presence of errors2. Sensor initialization has not been successful	1. Continue as described by the diagnostic equipment2. Carry out the sensor initialization procedure correctly.
2	WHEEL SENSORS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner, check that the sensor involved does not have a run down batteryCheck if the sensor has been replaced or the position of one of the wheels has been changed without having carried out the initialization procedure for the sensor on the wheel concerned using the Examiner	Move on to Step 3	1. Sensor battery run down2. The initialization of the IDs for the wheel transmitters	1. Replace the front sensor Op. 4450B92 FRONT TYRES PRESSURE TRANSMITTER, (ONE) LH OR RH - R R or the rear sensor Op. 4450B93 REAR TYRES PRESSURE TRANSMITTER, (ONE) LH OR RH - R R 2. Move on to Step 8 to carry out the initialization procedure for the wheel transmitter IDs
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in active diagnosis, carry out the Aerial activation test and check that it is working properly	End of diagnosis	No aerial RF signal	Move on to Step 4
4	AERIAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the aerial is receiving a correct power supplyCheck the continuity of the supply wiringCheck the continuity of the signal between the tyre pressure monitoring control unit and the activator.Check the insulation of the earth wiring See E7060 TYRE INFLATION PRESSURE CONTROL SYSTEMby carrying out See Test 4450BB TPMS SYSTEM TRANSMITTER AERIAL OPERATION CHECK	End of diagnosis	1. Power supply interrupted2. Earth connection defective3. Activator signal interrupted4. Wiring defective5. Wiring short circuited to earth6. Aerial defective	1. Restore correct power supply2. Restore correct earth connection.3. Restore signal continuity.4. Restore or, if necessary, replace wiring5. Restore wiring insulation6. Replace the aerial
5	TYRE PRESSURE CONTROL UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the power supply for the tyre pressure control unit is correctCheck the connection to earth for the control unitCheck the conformity of the output signals to the aerialCheck the wiring continuityCheck the insulation of the earth wiring See E7060 TYRE INFLATION PRESSURE CONTROL SYSTEMby carrying out See Test 4450BB TPMS SYSTEM TRANSMITTER AERIAL OPERATION CHECK	Move on to Step 6	1. Supply not correct2. Earth connection defective3. Signals interrupted4. Wiring broken5. Wiring short circuited6. Tyre inflation pressure control unit defective	1. Restore correct power supply2. Restore the correct earth connection.3. Restore signal continuity4. Restore wiring continuity5. Restore the correct wiring insulation.6. Replace the tyre pressure monitoring control unitSee Test 4450B91 TPMS SYSTEM CONTROL UNIT R R
6	CORRECT AERIAL POSITION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the aerial is correctly installed (the aerial wiring should be facing the vehicle interior)	Move on to Step 7	1. Activator incorrectly positioned2. Activator defective	1. Position the activator correctly2. Replace the activator
7	ELECTROMAGNETIC INTERFERENCE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for any electromagnetic interference produced by electronic equipment in the vehicle or the immediate vicinity	Move on to Step 8	Electromagnetic fields which interfere with the signal produced by the pressure sensors	Eliminate the source of the interference as follows: if it can be ascertained that the electromagnetic field that is interfering is coming from the outside, move the vehicle away from that place.If not, search for any RF equipment fitted by the customer and try and deactivate it.
8	WHEEL TRANSMITTER INITIALIZATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner, enter the Configuration ambient and select Wheel transmitter initialization to obtain the identification of the wheel transmitters for the control unit	Move on to Step 9	Wheel transmitter initialization not carried out	Carry out wheel transmitter initialization correctly.
9	BIDIRECTIONAL SERIAL LINE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the system configuration is correct using the ExaminerCheck the continuity of the two-way serial line between the pressure monitoring control unit and the Body Computer See E7060 TYRE INFLATION PRESSURE CONTROL SYSTEMCheck that the serial line is correctly insulated to earth by carrying out See Test 4450BA TPMS CONTROL UNIT OPERATION CHECK	Move on to Step 10	1. Serial line broken2. Serial line short circuited to earth3. System configuration not correct4. Tyre inflation pressure control unit defective	1. Restore the correct continuity2. Restore the correct insulation3. Configure the control unit correctly4. Replace the tyre inflation pressure control unit Op. 4450B91 TPMS SYSTEM CONTROL UNIT R R
10	CORRECT OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Delete the errors using the Examiner and check they are no longer present	End of diagnosis	Body Computer defective	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.