Pin 21 voltages to high when cold, and 0 voltages when warm...
06-05-12, 06:50 PM
#1
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Pin 21 voltages to high when cold, and 0 voltages when warm...
Ok I got an 88 vert with 87 t2 electronics, ecu, afm, etc... With an s5 t2 block. The car will start only with starter fluid so I checked the water thermo sensor voltages at the ecu and this is what I got:
Pin 21, engine cold, key to "on": 4.98 volts
Pin 21, engine warmed, key to "on" 0.000 volts
Pin 3b, key to "start": 9.40 volts
Now all these voltages were read while car was not running. So my pin 21 volts are a lil high on cold and nothing while warm? What's your thoughts? What could cause these strange readings???
Pin 21, engine cold, key to "on": 4.98 volts
Pin 21, engine warmed, key to "on" 0.000 volts
Pin 3b, key to "start": 9.40 volts
Now all these voltages were read while car was not running. So my pin 21 volts are a lil high on cold and nothing while warm? What's your thoughts? What could cause these strange readings???
06-09-12, 12:04 PM
#3
Either your connection is still poor or there is a break in the wiring between the sensor and the ECU (a resistance test would tell you if this were the case) or the sensor is bad . If your car starts and continues to run after starter fluid is used then the ECU not getting a proper signal from the sensor and is the likely cause of your problem. The car should run fine w/o the trailing coil as it used to ignite whatever fuel is left over after the firing of the leading coil. This helps to reduce emissions.
If the Water Thermosensor were placed in a pot of water and the water temp was 68 degrees Farenheit then the ohm reading would be 2.45 ohms. If the water temp is heated to 176 degrees then the ohm reading would be .32 ohms. This will tell you of the condition of the sensor so as to either rule it out as the cause or otherwise.
If the Water Thermosensor were placed in a pot of water and the water temp was 68 degrees Farenheit then the ohm reading would be 2.45 ohms. If the water temp is heated to 176 degrees then the ohm reading would be .32 ohms. This will tell you of the condition of the sensor so as to either rule it out as the cause or otherwise.
06-10-12, 04:35 PM
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Either your connection is still poor or there is a break in the wiring between the sensor and the ECU (a resistance test would tell you if this were the case) or the sensor is bad . If your car starts and continues to run after starter fluid is used then the ECU not getting a proper signal from the sensor and is the likely cause of your problem. The car should run fine w/o the trailing coil as it used to ignite whatever fuel is left over after the firing of the leading coil. This helps to reduce emissions.
If the Water Thermosensor were placed in a pot of water and the water temp was 68 degrees Farenheit then the ohm reading would be 2.45 ohms. If the water temp is heated to 176 degrees then the ohm reading would be .32 ohms. This will tell you of the condition of the sensor so as to either rule it out as the cause or otherwise.
If the Water Thermosensor were placed in a pot of water and the water temp was 68 degrees Farenheit then the ohm reading would be 2.45 ohms. If the water temp is heated to 176 degrees then the ohm reading would be .32 ohms. This will tell you of the condition of the sensor so as to either rule it out as the cause or otherwise.
06-10-12, 04:44 PM
#6
Well that proves the sensor is good so you need to take an ohm reading of the G/W wire itself to see if it checks out okay. If it does then that would narrow down the problem to either the connection or the ECU, but it would most likely be the connection.
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