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I have a 1994 cadillac sedan deville with a 4.9 engine. The message center in the instrument cluster says the voltage is too high. I have replaced the alternator but still comes on . Maybe you can help me. Thank You.
Re: I have a 1994 cadillac sedan deville with a 4.9...
The first thing to do is have the battery tested and then the charging system checked, this will show you if its overcharging,if it is overcharging then take a look at the wiring going to alternator,and also a bad battery can also cause a problem so first find out if message center is displaying the correct message, this will show if center is okay then move on to battery testing then alternator test, there may be a problem with the wiring or a defective alternator.
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Doesn't have a fuse just for the gauges . B+ power supply for the whole instrument cluster . Gauge info comes from the BCM - body control module an the PCM - powertrain control modules over serial data network (GMLAN ) The instrument cluster has electronics inside ,plus software . GM did have stepper motor problems in their instrument clusters from 2003 to 2006 . Your best bet , take it to a qualified repair shop. How to repair GM Instrument Cluster Speedometer Gauge Stepper
Engine Coolant Temperature Gage
The engine control module (ECM) sends the coolant temperature to the instrument panel cluster (IPC) via serial data circuit. The IPC receives serial data messages from the BCM indicating the engine coolant temperature. The engine coolant temperature (ECT) gage, if equipped, defaults to 75°C (160°F) or below if:
• The ECM detects a malfunction in the ECT sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
Refer to Cooling System Description and Operation for more information.
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the engine control module (ECM). The ECM sends a 4,000 pulse per mile signal to the cluster discretely. The IPC calculates the vehicle speed using the time difference between consecutive pulses. The speedometer will default to zero if the time duration since the last speed pulse is greater than or equal to one second.
Fuel Gage Description and Operation
The ECM uses the signal circuits of the primary and secondary fuel level senders to calculate the percentage of fuel remaining in the fuel tank. The ECM supplies 5 volts via the 5 volt reference circuit and also provides a low reference to the primary and secondary fuel level senders. When the fuel tank is full, the resistance of both fuel level senders are high and the ECM senses a high signal voltage on both the signal circuits of the primary fuel level sender and the secondary fuel level sender. When the fuel tank is empty, the resistance of both fuel level senders are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sender and the secondary fuel level sender. The engine control module (ECM) sends fuel level information to the instrument panel cluster (IPC) via serial data circuit. The instrument panel cluster (IPC) displays the fuel level information in the fuel gage. When the fuel level is less than a predetermined value, the low fuel message displays in the driver information center (DIC).
The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
You can check on line from the different parts stores of visit your neighborhood store. They will probably need to order it. A Cadillac Dealership may have one in stock.
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https://www.youtube.com/watch?v=dXLzsEm1-0Y
Oct 20, 2010 - Uploaded by 1969Bossman429
We dropped our 2000 Cadillac DeVille DTS off at the local Cadillac ... He got into the vehicle, turned the key and the vehicle was still revving at full throttle. ... He raised the hood, reached in to the throttle body area and cycled ...Missing: 1994 chatter activated
Jan 17, 2005 - For my Review I will write about the 1994 Sedan Deville. ... A stifferbody this year made the Deville much quieter over the outgoing 1993 DeVille. ... First is a key when your looking at just about any Cadillac, push "off" and "warmer", this ...Have a helper hold the throttle plates wide open with the engine off.
CarGurusJan 21, 2014 - Cadillac Deville 2001 won't start, engine won't turn over - My cadillac won't start. When i turn the key the engine wont turn over and when i do turn the. ... bad replace was told alt was intermenting so that's wat caused issue now car .... intake plenum (the tube between the Mass Air Flow and the throttle body).Missing: 1994 chatter activated
Do you have base instrument cluster) or high series instrument cluster) ?
Symptom Chart
Condition
Possible Sources
Action
The message center is not operating correctly (base instrument cluster)
Instrument cluster
OBSERVE the operation of the message center when pressing the TRIP/SELECT button. Does the message center display change when the TRIP/SELECT button is pressed?
If the message center display changes, the system is operating normally at this time.
If the message center display does not change, INSTALL a new instrument cluster. REFER to Section 413-01 . TEST the system for normal operation.
The message center is not operating correctly (high series instrument cluster)
If you are refering to the Engine Coolant Temperature (ECT) sensor,it is located on the right rear of the engine below the exhaust gas recirculation (EGR) valve.
HINT: If your Deville is equipped with the analog instrument cluster and the temperature gauge is working, or if you have the digital instrument cluster and the driver information center (DIC) has been diplaying messages telling you that the engine is hot, the problem with your engine cooling fans is NOT the sensor.
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