Engine coolant temperature signalled by instrument too low

Make: Fiat
Model: Ulysse Factory Service Manual
Year: 2002–2010
Section: Instrument panel › Engine coolant temperature signalled by instrument too low

‹ Prev Engine coolant overheating warning light not working Next › Minimum engine oil pressure warning light not working

Fault diagnosisEngine coolant temperature signalled by instrument too low

ENGINE COOLANT TEMPERATURE SIGNALLED BY INSTRUMENT TOO LOW

The message for the engine coolant temperature gauge is produced by the CCM Engine Management Node, converted by the Body Computer Node and then displayed in the by the Instrument Panel Node in the instrument in the centre of the dashboard.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	TEMPERATURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the temperature of the engine sensor corresponds to the instrument reading.	Move on to Step	1. The temperature gauge is not working fully.	2. See table K25 ENGINE COOLANT TEMPERATURE GAUGE NOT WORKING
			2. The temperature gauge indicates very different values.	Move on to Step
			3. The temperature gauge is working, with very close readings between the two instruments.	Move on to Step
2	BATTERY VOLTAGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the battery voltage is correct by reawakening the network.	Move on to Step	Battery voltage not correct.	Restore the correct voltage.
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check, in the Instrument Panel ambient, that there are no errors and that the parameters are present.	Move on to Step	4. Impossible to connect with the control unit.	Move on to Step
		Move on to Step	5. Errors present	Move on to Step
4	ERRORS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the presence of one or more of the following errors using the Examiner in the Instrument Panel ambient: No communication with the BSI VAN line error Control unit broken Coolant temperature error	Move on to Step	1. No communication with Body Computer error detected and/or VAN CONfor. network error and/or control unit broken.	Move on to Step
		Move on to Step	2. Coolanat temperature error detected	Move on to Step
5	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in the Instrument Panel ambient check that the function in question is correctly activated in Active Diagnosis. Coolant temperature gauge	Move on to Step	The component in question is not being operated correctly by the active diagnosis.	Replace the Instrument Panel Node control unit.
6	CONTROL UNIT ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical circuit for the Insrument Panel Node and Body Computer systems, in order: Presence of battery positive at the network connection Wiring between the Body Computer and the Node in question. Control unit earth	Move on to Step	1. System faulty no positive caused by a control unit.	1. Replace the component involved
			2. System faulty no positive caused by the wiring	2. Repair wiring.
			3. Control unit earth faulty	3. Restore the correct operation of the control unit earth
			4. Instrument Panel Control Unit faulty.	4. Replace the Instrument Panel control unit.
7	BATTERY VOLTAGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the battery voltage is correct by reawakening the network.	Move on to Step	Battery voltage not correct.	Restore the correct voltage.
8	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check, in the Body Computer ambient, that there are no errors and the following parameter is present and varies: Coolant temperature	Move on to Step	1. Impossible to connect with the control unit.	1. Replace the Body Computer control unit.
			2. Presence of errors.	Move on to Step
			3. No variation in the values of the parameter selected	Move on to Step
9	ERRORS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the presence of one or more of the following errors using the Examiner in the Body Computer ambient: VAN CONF error: connection with Instrument Panel VAN CONF command inconsistency Multif. or Navig. display error CAN line error (connection with other control units)	Move on to Step	1. No communication with Instrument Panel error detected and/or VAN CONfor. network error and/or control unit broken.	Move on to Step
			2. No communication with Engine Management Control Unit error detected and/or CAN error and/or control unit broken.	Move on to Step
			3. Control unit broken.	3. Replace the Body Computer control unit
9	CONTROL UNIT ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical circuit for the Insrument Panel Node, the Engine Management Control Unit Node and the Body Computer systems, in order: Presence of battery positive at the network connection Wiring between the Body Computer and the Node in question. Protective/supply fuse(s). Control unit earth	Move on to Step	1. System faulty, error due to control unit.	1. Replace the Body Computer control unit
			2. System faulty, error due to wiring.	2. Restore wiring
			3. Protective fuse/s blown	3. Replace the component involved (in the case of a fuse, find out what caused it to blow).
			4. Control unit earth faulty	4. Restore the correct operation of the control unit earth
			5. Body Computer control unit faulty.	5. Replace the Instrument Panel control unit.
10	BATTERY VOLTAGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the battery voltage is correct by reawakening the network.	Move on to Step	Battery voltage not correct.	Restore the correct voltage.
11	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment, check, in the Engine Management Control Unit Node ambient, that there are no errors and that the parameters are present	Move on to Step	1. Impossible to connect with the control unit.	Move on to Step
			2. Presence of errors.	Move on to Step
			3. The values do not change with the engine running	3. Replace the Engine Management Control Unit
12	ERRORS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the presence of one or more of the following errors using the Examiner in the Engine Management Control Unit Node ambient: CAN line error (connection with other control units) CAN line No communication between injection ECU and other control units No communication on CAN Internal control unit error	Move on to Step	1. No communication with Body Computer error detected and/or CAN error and/or control unit broken.	Move on to Step
			2. No communication with CAN error detected	Move on to Step
			3. Internal injection control unit error detected	3. Replace the Engine Management control unit.
13	ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical circuit for the Engine Management Control Unit Node and the Body Computer Node systems, in order: Protective/supply fuse(s). Wiring. Control unit earth.	Move on to Step	1. CAN faulty, caused by a control unit.	1. Replace the component involved
			2. CAN faulty, caused by the wiring	2. Restore wiring
			3. Protective fuse/s blown	3. Replace the component involved (in the case of a fuse, find out what caused it to blow).
			4. Control unit earth faulty	4. Restore the correct operation of the control unit earth
			5. Engine Management control unit faulty.	5. Replace the Engine Management control unit.
			6. Body Computer control unit faulty.	Move on to Step
14	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

‹ Prev Engine coolant overheating warning light not working Next › Minimum engine oil pressure warning light not working

Parts & tools for this job For 2002 Fiat Ulysse

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.