Wednesday, March 25, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1706

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1706



- Park/Neutral Position (PNP) Switch Circuit



DTC P0851



- Park/Neutral Position (PNP) Switch Circuit Low Voltage



DTC P0852



- Park/Neutral Position (PNP) Switch Circuit High Voltage



Diagnostic Fault Information



Typical Scan Tool Data



Circuit/System Description



The transmission manual shift shaft switch assembly, also known as the internal mode switch (IMS), is a sliding contact switch attached to the



manual shift shaft inside the transmission case. The park/neutral position (PNP) switch is integrated into the IMS and connects to the transmission



control module (TCM) lead-frame through a short wire harness. The circuit uses the TCM as a pass-through connector only.



The Park/Neutral Signal is sent from the park/neutral switch directly to the engine control module (ECM) and is used for engine start enable.



Conditions for Running the DTC



* Ignition voltage is between 11-18 volts.



* Engine Speed is 1000 RPM or greater.



* TP is 8 percent or greater.



* Engine torque is 75 Nm (55 lb ft) or greater.



* Vehicle speed is 10 km/h (6 mph) or greater.



Conditions for Setting the DTC



P0850 or P0851



The ECM detects the Park/Neutral switch signal equals 0 volts, Low, when the IMS reports a Drive range.



P0852



The ECM detects the Park/Neutral switch signal equals 12 volts, High, when the IMS reports a Park/Neutral range.



Action Taken When the DTC Sets



* DTCs P0850, P0851, and P0852 are Type C DTCs.



* The ECM uses IMS Range for engine start-up.



Conditions for Clearing the DTC



DTCs P0850, P0851, and P0852 are Type C DTCs.



Reference Information



Schematic Reference



* Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)



* Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



* Component Connector End Views (See: Diagrams/Connector Views)



* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

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