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Where is the fuel sending unit on 1994 chevy astro van


the sending unit is located inside the fuel tank beside the fuel pump. it operates like a rheostat, the float rises and the resistance in it increases and the float lowers and the resistance lowers as the fuel level changes.

Sep 10, 2015 | Cars & Trucks

1 Answer

2004 vy commodore. What is temp sender unit resistance?


it is a variable resistance that changes with the coolant temperature
when it is cold ,that is the highest resistance and when it boiling ,that is the lowest resistance
It is the variable resistance that gives the readings on the gauge.

Jun 18, 2015 | Cars & Trucks

2 Answers

OHMS Resistance for temp gauge


The OHM's are different from manufacturers. Usually the work or don't. I just test the leads and heat up the sensor with a lighter. If the resistance changes, it is good. If it doesn't read or doesn't change, it is bad. Wires usually break right behind the plug. Check for continuity at the lead and about two inches back on the wire.

Jun 18, 2015 | Cars & Trucks

1 Answer

I change the temperature sensor but the needle does not move how can I change the needle? This is a 95 ford Econoline 350


you have probably been misinformed. The needle on the temperature gauge is controlled by the temperature SENDER unit ( not the temperature SENSOR unit) The sender unit is a single wire unit that is a resistance unit affected by heat of the coolant, The hotter the coolant the less resistance the higher the reading
The temperature sensor unit is a 2 wire unit that tells the ECM when to switch on the fan, when to go into limp mode if overheating and when to adjust the air/fuel mixture as the coolant warms up

Oct 20, 2014 | Ford Cars & Trucks

1 Answer

Why fuel gauge moves around


The fuel sensor in the fuel tank works by a changing resistance by rubbing a piece of metal against different values of resistance in short it's going bad must replace the whole unit fuel pump and all is one unit

Aug 29, 2014 | 1999 Buick Century

1 Answer

Hi.. please help me.. my minolta dialta 183 is not working.. there's a code CO5 in the screen.. please help me to fix it.. thanks


C0500: Warm-up failure

Step 1
Check:
Fusing Heater Lamp (H1) turns
ON.

Step 2
Check:
Fusing Heater Lamp (H1) is open-circuited.
<Check Procedure>
Check the resistance across both
ends of the Fusing Heater Lamp
(H1).
The Fusing Heater Lamp is open-circuited
if the resistance is infinity.

Result: YES
Action: Change Fusing Heater Lamp (H1).

Step 3
Check: Thermoswitch 1 (TS1) is operational.
<Check Procedure>
Check the resistance across both
ends of the Thermoswitch 1 (TS1).
The Thermoswitch 1 is open-circuited
if the resistance is infinity.

Result: NO
Action: Change Thermoswitch 1 (TS1).

Step 4
Check: Fusing Unit Interlock Switch (S2) is
operational.
<Check Procedure>
Check continuity across terminals
when the Fusing Unit Interlock
Switch (S2) is turned ON.
• Across S2-1A and S2-1B
• Across S2-2A and S2-2B

Result: NO
Action: Change Fusing Unit Interlock
Switch (S2).

Result : YES
Action: Change DC Power Supply (PU1).

Step 5
Check: Thermistor (TH1) is open-circuited.
<Check Procedure>
Check the resistance across CN15-2
and CN15-3 on the Fusing Unit side
with CN15 disconnected.
The Thermistor is open-circuited if
the resistance is infinity.

Result: YES
Action: Change Thermistor (TH1).

Step 6
Check: The following voltages are supplied
from the Master Board (copier: PWBA).
<Check Procedure>
Check voltage across a Master Board
(copier: PWB-A) pin and GND when
the Power Switch is turned ON.
• Voltage across PJ10A-7 and GND
DC24 V when Fusing Heater Lamp
(H1) is OFF
DC0 V when Fusing Heater Lamp
(H1) is ON
• Voltage across PJ10A-10 and
GND
DC24 V when Fusing Heater Lamp
(H1) is OFF
DC0 V when Fusing Heater Lamp
(H1) is ON

Result: NO
Action: Change Master Board (copier:
PWB-A).

Oct 05, 2011 | Konica Minolta DiALTA Di200 Copier

1 Answer

Minolta dialta 183 help me... theres a code in the screen CO5 .. and automatically turn off.


C0500: Warm-up failure

Step 1
Check:
Fusing Heater Lamp (H1) turns
ON.

Step 2
Check:
Fusing Heater Lamp (H1) is open-circuited.
<Check Procedure>
Check the resistance across both
ends of the Fusing Heater Lamp
(H1).
The Fusing Heater Lamp is open-circuited
if the resistance is infinity.

Result: YES
Action: Change Fusing Heater Lamp (H1).

Step 3
Check: Thermoswitch 1 (TS1) is operational.
<Check Procedure>
Check the resistance across both
ends of the Thermoswitch 1 (TS1).
The Thermoswitch 1 is open-circuited
if the resistance is infinity.

Result: NO
Action: Change Thermoswitch 1 (TS1).

Step 4
Check: Fusing Unit Interlock Switch (S2) is
operational.
<Check Procedure>
Check continuity across terminals
when the Fusing Unit Interlock
Switch (S2) is turned ON.
• Across S2-1A and S2-1B
• Across S2-2A and S2-2B

Result: NO
Action: Change Fusing Unit Interlock
Switch (S2).

Result : YES
Action: Change DC Power Supply (PU1).

Step 5
Check: Thermistor (TH1) is open-circuited.
<Check Procedure>
Check the resistance across CN15-2
and CN15-3 on the Fusing Unit side
with CN15 disconnected.
The Thermistor is open-circuited if
the resistance is infinity.

Result: YES
Action: Change Thermistor (TH1).

Step 6
Check: The following voltages are supplied
from the Master Board (copier: PWBA).
<Check Procedure>
Check voltage across a Master Board
(copier: PWB-A) pin and GND when
the Power Switch is turned ON.
• Voltage across PJ10A-7 and GND
DC24 V when Fusing Heater Lamp
(H1) is OFF
DC0 V when Fusing Heater Lamp
(H1) is ON
• Voltage across PJ10A-10 and
GND
DC24 V when Fusing Heater Lamp
(H1) is OFF
DC0 V when Fusing Heater Lamp
(H1) is ON

Result: NO
Action: Change Master Board (copier:
PWB-A).

Oct 05, 2011 | Minolta DiALTA Di183 Copier

2 Answers

The tempertature gauge does not work on my jeep what may be the problem?


Could be the coolant temp sensor:


d3ad89d.gif
4.0L engine shown




7a3db5f.gif
5.2L engine shown



To test it:

Perform this test on a cold or cool engine.
  1. Disconnect the negative (-) battery cable.
  2. Unplug the electrical wiring from the sending unit.
  3. Using an ohmmeter, measure the resistance between the terminal and the sending unit's metal body
    1. Infinite resistance or zero resistance: the sending unit is bad, replace the sender with a new one.
    2. Other than infinite or zero resistance: continue test.
  4. Remove the temperature sender from the engine.
  5. Position the sending unit so the metal shaft (opposite end from the electrical connectors) is in a pot of water. Make sure that the electrical connector is not submerged and only the tip of the sending unit's body is in the water.
  6. Heat the pot of water at a medium rate. While the water is warming, continue to measure the resistance of the terminal and the metal body of the sending unit:
    1. As the water warms up, the resistance goes down in a steady manner: the sending unit is good.
    2. As the water warms up, the resistance does not change or changes in erratic jumps: the sender is bad, replace it with a new one.
  7. Install the good or new sending unit into the engine, then connect the negative battery cable.
  1. With the engine cold, remove the ECT sensor.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the sensor resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.

75c7153.gif
Submerge the end of the temperature sensor in cold or hot water and check resistance


082c068.gif
Temperature-to-resistance relationship of the ECT and MAT sensors

Apr 28, 2010 | 1995 Jeep Grand Cherokee

1 Answer

When the gas tank is full the gas gauge shows as empty. When the gas tank is empty the gas gauge shows as full.


Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.

Jul 17, 2009 | 1999 Chevrolet Cavalier

3 Answers

99 chevy silverado fuel gage malfunctions


A bad electric connector is possible. A bad tank sending unit can cause the same symptom. Usually the sending unit is a reostat mounted inside the tank.. it changes resistance depending on the float position, the resistance change causes a different voltage to the gauge or signal processor. The reostat may be a resistive plastic strip, as the float moves a contact pointer wipes the length of strip thus the change in resistance and voltage. Clear as mud?

Apr 06, 2009 | 1999 Chevrolet Silverado 1500

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