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P1500 clutch assembly

I tried removing the clutch assembly thinking it was the solenoid coil but after applying voltage to it it worked normally. When I test the connector on the board where this gets its power from its only 0.8v dc thrughout the test page cycle, It should be 24vdc or lower but not .8. When I latch the clutch in manually with a screw driver It pulls the paper then jams. I got it to print a test page once while engaging the clutch lockout at different times but I cannot replicate. Just got lucky My question is what tells the clutch to engage or where can I trace the power loss for it. I do nothing with the clutch it never pulls the paper thru since the roller with the clutch will not spin. All the circuit boards have no apparent problems as far as burnt spots or solder joints. I see no paper position sensor where is it? Help Please

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If your only getting .8v then you have a bad board, does'nt have to show burnt spots. Change the board.

Posted on Oct 19, 2007

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1 Answer

Where is P0877 automatic transmission fluid sensor located on a 2007 GMC Acaidia


DTC P0877: Transmission Fluid Pressure (TFP) Switch 4 Circuit Low Voltage

The transmission fluid pressure (TFP) switch 4 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to the TFP switch 4 on the TFP switch 4 signal circuit; the TFP switch 4 has an internal case ground. TFP switch 4 is normally closed, Low. When oil pressure is present at the TFP switch 4, the switch is open, high. The normally low clutch pressure control (PC) solenoid 4-5 controls the transmission fluid to the 1-2-3-4 clutch. The TCM monitors the normally closed TFP switch 4 signal circuit to determine the 1-2-3-4 clutch status.
P0877
The TCM detects that the TFP switch 4 signal voltage remains low, 0 volts when the 1-2-3-4 clutch is commanded ON for 5.5 seconds or greater.

Action Taken When the DTC Sets
• DTCs P0877 and P0878 are Type C DTCs.
• The TCM freezes transmission adaptive functions.

Circuit/System Testing
Ensure the TFT is near the temperature displayed in the Failure Records.
Start the engine and place the transmission range selector in D6.
Observe the TFP switch 4 parameter while commanding 4th gear and then commanding 5th gear with the scan tool. The TFP Switch 4 should transition from High in 4th gear to Low in 5th gear.
? If the TFP switch 4 parameter state does not change, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
? If no concerns are found, replace the control solenoid (w/body and TCM) valve assembly.
Component Testing
Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control solenoid (w/body and TCM) valve assembly replacement - refer to Control Module References for replacement, setup, and programming.
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1999 GMC Sonoma 2.2L will not start.


What is wrong????????? That would be a guess on anyones part here ! Testing the electrical circuits involved would be the proper way to diagnose this no start problem ! Using a volt meter an wiring diagram to check voltage at different point's in the starter circuit . voltage drop testing ! Plus knowing how the starter system works !
Starter Circuit Operation
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