Sunday, May 30, 2021

2010 Cadillac Truck SRX AWD V6-3.0L Page 1774

2010 Cadillac Truck SRX AWD V6-3.0L Page 1774



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC P0850



- 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 8-18 volts.



* Engine speed is greater than 1000 RPM.



Conditions for Setting the DTC



P0850 and P0851



* The ECM detects the Park/Neutral switch signal equals 0 volts (Park/Neutral) when the IMS reports a Drive range for 0.2 second.



* TP is equal to or greater than 10 percent.



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



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



P0852



The ECM detects the Park/Neutral switch signal equals 12 volts (In-Gear) when the IMS reports a Park/Neutral range for 0.2 second.



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.

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