2010 Cadillac CTS Sedan AWD V6-3.0L Page 1674

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2010 Cadillac CTS Sedan AWD V6-3.0L Page 1674



1. Ignition OFF, disconnect the automatic transmission manual shift switch harness connector.



2. Ignition ON, test for 11-13 volts on terminal H on the automatic transmission manual shift switch harness connector and ground.



瀚慖f not within the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests



normal, replace the BCM.



3. Ignition OFF, shift the automatic shift lever into the M position.



4. Ignition OFF, test for 6.6-7.0 k ohm between terminal D and terminal H on the automatic transmission manual shift lever harness connector.



Also test for 3.7-4.2 k ohm when pushing back on the shift lever and 1.7-2.0 k ohm when pushing forward on the shift lever.



瀚慖f not within the specified values, replace the automatic transmission shift lever assembly.



5. Ignition OFF, connect a 3A fused jumper wire between terminal D and terminal H on the automatic transmission manual shift switch harness



connector.



6. Ignition ON, test for 11-13 volts on the BCM connector X1 terminal 20 and ground.



瀚慖f not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace



the BCM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Replace the AT shift program switch. Refer to Transmission Control Replacement (See: Transmission and Drivetrain/Automatic



Transmission/Transaxle/Shifter A/T/Service and Repair/Transmission Control Replacement).



* Replace the body control module. Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for



replacement, setup, and programming.



P0842



DTC P0842 or P0843



Diagnostic Instructions



* 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 P0842



- Transmission Fluid Pressure (TFP) Switch 1 Circuit Low Voltage



DTC P0843



- Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage



Diagnostic Fault Information



Typical Scan Tool Data

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