It happened a month ago and I replaced ENG1 Relay and it fixed the problem. Till last night it happened again and the Relay did not fix the problem Any Ideas?
Well ronnie do you know how to do automotive electrical testing with a volt meter ? How to read an understand a wiring diagram ? Would think not to be a relay problem because other thing's would not work as well ! More then likely a loose ground or something on that order ! Plus you must mean Ignition . 1 relay , because there isn't a eng.1 relay . Ign. 1 relay powers the PCM - engine computer , fuel injectors , the TAC - electronic throttle control module . Do the instrument cluster lights still work when the gauges quit ? Looking at power distribution diagram I see a engine 1 fuse but has nothing to do with the instrument cluster . Supply's B+ voltage to the maf sensor , EVAP system , CAM sensor , IAT sensor , fuel pump relay ! Could be a communication problem on class 2 data bus . All the modules on the vehicle share information on the class 2 bus . The gauges get thier info from the PCM over this data network !
Engine Coolant Temperature Gauge
The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The engine coolant temperature gauge defaults to 75°C (160°F) or below when:
• The PCM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communication with the PCM.
Fuel Gauge
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gauge defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.
Reviewing the fuel system description will further explain how the system functions. Refer to:
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The IPC receives the vehicle speed signal via a discreet wire. The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit (4000 pulses/mile) exists.
Tachometer
The IPC displays the engine speed based on the engine speed signal from the PCM. The IPC receives the engine speed signal from the PCM via a discreet wire. The IPC uses the engine speed signal circuit (2 pulses/engine revolution) from the PCM in order to calculate the engine speed. The tachometer defaults to 0 rpm if a malfunction in the engine speed signal circuit (2 pulses/engine revolution) exists.
Transmission Temperature Gauge
The IPC displays the transmission temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the transmission temperature. The transmission temperature gauge will default to 40°C (100°F) or below if:
• The PCM detects a malfunction in the transmission temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
Voltmeter
The IPC displays the system voltage as detected at the ignition 1 input of the IPC. When the engine is ON, the gauge should be between 10 and 16 volts.
The only one that has a hard wired sensor is the oil pressure gauge.
Engine Oil Pressure Gauge
The IPC uses the engine oil sensor signal to determine the engine oil pressure. The oil pressure sensor signal circuit is hard-wired to the IPC. The engine oil pressure sensor signal to the IPC is a variable resistance ranging from 0-90 ohms. A sensor resistance of 1 ohms will display as 0 psi (0 kPa) and a resistance of 88 ohms will display as 80 psi (550 kPa). The Check Engine Oil Pressure indicator will be displayed in the message center if the IPC detects a low engine oil pressure.
Does this one drop out also ? quit working
I would suggest that you take an have the IPC checked for DTC'S - diagnostic trouble codes , NOT OBD 2 engine codes , these are different an need a professional type scan tool .
You could check G103 for being loose . G103
On the left rear of the engine block . Also pull the instrument cluster out an check connection at the back of IPC . Check power an ground circuits at the PCM as well . You can fine wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter the vehicle info . year , make , model an engine . under system click body an acc. then under subsystem click on instrumentation .Click the search button , then click the blue link . At the top of the diagram it shows B+ power supply , The connectors on the back of IPC , A,B , plus the pin # an color wire .
PCM power and ground testing avi
How To Use Multimeter Test Car Ground Video 3
Intermittent Electrical Diagnostics with Rich Peterson
Testimonial: "thank you! thinking back, 14 days before I had to replace the fuel pump. Hummmm Sounds like it may be a Ground.... I'm going to go check this out now Do you think it has any thing to do with me replacing the fuel pump I had a test done it shows P0446 emission co. P0740 Torque computer clutch P0753 shift solenoid a P0758shift solenoid b P0785 shift timming P1860 oil pressure idol 50 volts just over 14 dash lights work except lights on RND321 If I hold down on on the mileage trip reset everything works fine except transmition is still Sluggish...."
Did you do anything for the codes you have listed ? Replace sensors or anything like that ? When you said about pushing the mileage trip reset and thing's work again makes me think the instrument cluster could be the problem . Is there a auto salvage yard near your ? Buy a used cluster for around $20.00 an see if that fixes the problems . A shorted electronic instrument cluster can cause all kind of problems .
You probably do have the tools i have at hand , one being a factory scan tool .I would hook it up an see if there are any DTC"s stored in the BCM - body control module or the instrument cluster etc..
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