Wednesday, January 22, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1707

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1707



shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.



Conditions for Running the DTC



P0778



* The ignition voltage is between 10.2-15.5 V.



* The engine speed is greater than 400 RPM for 2 s.



* The transmission is not in emergency mode.



* Driving in D range.



* TCM communication is normal.



* DTCs P0966 and P0967 are not set.



P0965



* The ignition voltage is between 10.2-15.5 V.



* The engine speed is greater than 400 RPM for 2 s.



* The transmission is not in emergency mode.



* Driving in D range.



* TCM communication is normal.



* The automatic transmission fluid temperature is more than 20掳C (68掳F).



* SLC1 current is more than 0.85 A.



* SLC1 target current is not changed.



P0966



* The ignition voltage is between 10.2-15.5 V.



* The engine speed is greater than 400 RPM for 2 s.



* The transmission is not in emergency mode.



* Driving in D range.



* TCM communication is normal.



* DTC P0967 is not set.



P0967



* The ignition voltage is between 10.2-15.5 V.



* The engine speed is greater than 400 RPM for 2 s.



* The transmission is not in emergency mode.



* Driving in D range.



* TCM communication is normal.



* DTC P0966 is not set.



Conditions for Setting the DTC



P0778



Deviation between commanded current and feedback current.



P0965



The TCM detects the error current more than 80 mA for 2.75 ms.



P0966



The TCM detects at least 5 times less than 23 mA current consumption of the SLC1 control circuit for 100 ms.



P0967



The TCM detects at least 5 times more than 1.333 A current consumption of the SLC1 control circuit for 100 ms.



Action Taken When the DTC Sets



P0778, P0965



* DTC P0965 is a Type B DTC.



* The TCM turns OFF all solenoids.



* The TCM allows the vehicle after a stop to operate only in the second gear and "R" range.



P0966, P0967



* DTCs P0966 and P0967 are Type B DTCs.



* No self learning function.



* The TCM turns OFF all solenoids.



* The TCM allows the vehicle after a stop to operate only in the second gear and "R" range.



Conditions for Clearing the DTC

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1671

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1671



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



Connector End View Reference



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



* Inline Harness Connector End Views (See: Diagrams/Connector Views/Multiple Junction Connector/Connector End Views By Number)



Description and Operation



Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -



Automatic Transmission/Electronic Component Description)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



DTC Type Reference



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Special Tools



DT-47825-20 Adapter Harness



Circuit/System Verification



1. If there are any other transmission DTCs set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See:



Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).



2. Perform the Range Selector Lever Cable Adjustment (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Shift



Linkage/Shift Cable/Adjustments) procedure to verify proper adjustment.



3. Ignition ON, observe the scan tool ECM PNP Switch parameter while moving the gear shift lever from Park and through all ranges. The



parameter should display Park/Neutral when in Park or Neutral and In-Gear when in Reverse or Drive.



4. Observe the scan tool TCM IMS A/B/C/P parameter while slowly moving the gear shift lever from Park through all ranges. The parameter



should match each gear range that is selected. Refer to Transmission Internal Mode Switch Logic (See: Specifications/Mechanical



Specifications/Automatic Transmission/Transaxle/System Specifications/6T70/6T75 - Automatic Transmission/Transmission Internal Mode



Switch Logic).



5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the



conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



Note: You must perform the Circuit/System Verification first.



1. Ignition OFF, disconnect the 20-way harness connector at the transmission.



2. Install the DT-47825-20 to the 20-way harness connector to the engine harness.



3. Test for less than 10 ohms between the ground circuit terminal 18 and ground.



瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.



4. Ignition ON, verify the scan tool ECM PNP Switch parameter displays In Gear.



瀚慖f not the specified value, test the P/N signal circuit for a short to ground. If the circuit tests normal, replace the engine control module.



5. Connect a 3-amp fused jumper wire between the TCM harness connector terminal 3 and terminal 18. Verify the PNP Switch parameter



changes to Park/Neutral.



瀚慖f not the specified value, test the P/N signal circuit for an open/high resistance. If the circuit tests normal, replace the engine control



module.



6. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement (See: Transmission and



Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and Repair/6T70/6T75 - Automatic Transmission/Control Valve Body

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1513

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1513



DTC P0698



- 5 V Reference 3 Circuit Low Voltage



DTC P0699



- 5 V Reference 3 Circuit High Voltage



Circuit/System Description



The engine control module (ECM) has 3 internal 5 V reference circuits. Each internal reference circuit provides external 5 V reference circuits for



more than one sensor. A short to ground or short to voltage on one external 5 V reference circuit can affect all the components connected to the



same internal 5 V reference circuit.



Conditions for Running the DTC



* The ignition is ON for greater than 3 s.



* DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above condition is met.



Conditions for Setting the DTC



The 5 V reference circuit voltage is above or below a predetermined threshold for greater than 1 s or for a cumulative of 10 s.



Action Taken When the DTC Sets



DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.



Conditions for Clearing the DTC



DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.



Diagnostic Aids



The 5 V reference 1, 2, and 3 circuits provide 5 V to the following sensors:



P0641, P0642, and P0643



* Economy mode switch



* Turbocharger pressure sensor



* Secondary air injection (AIR) pressure sensor



* Engine oil pressure (EOP) sensor



* Fuel tank pressure sensor



P0651, P0652, and P0653



* All four camshaft position sensors



* Accelerator pedal position (APP) sensor 1



P0697, P0698, and P0699



* Throttle position sensor 1 and 2



* Crankshaft position sensor



* Accelerator pedal position (APP) sensor 2



* A/C refrigerant pressure sensor



It may be possible to locate the fault by disconnecting one component at a time from the 5 V reference circuit while viewing the 5 V Reference



Circuit parameter on the scan tool. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all



5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.



Reference Information



Schematic Reference



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



(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Tuesday, January 21, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2032

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2032



Circuit/System Description



The serial data circuit is the means by which the control modules in the vehicle communicate with each other. Once the scan tool is connected to the



serial data circuit through the data link connector (DLC), the scan tool can be used to monitor each control module for diagnostic purposes and to



check for diagnostic trouble codes (DTCs). When the ignition switch is in RUN, each control module communicating on the serial data circuit



sends a state of health (SOH) message to ensure that the control module is operating properly. When a control module stops communicating on the



serial data circuit, for example if the control module loses power or ground, the SOH message it normally sends on the serial data circuit



disappears. Other control modules on the serial data circuit, which expect to receive that SOH message, detect its absence; those control modules in



turn set a DTC associated with the loss of SOH of the non-communicating control module. The DTC is unique to the control module which is not



communicating and one or more control modules may set the same exact code. A loss of serial data communications DTC does not represent a



failure of the control modules that contain the stored code.



Conditions for Running the DTC



The system voltage is between 9-16 V.



Conditions for Setting the DTC



A supervised periodic message that includes the transmitter module availability has not been received.



Action Taken When the DTC Sets



* Specific subsystems will not function.



* DTC U0100 in the TCM will cause the transmission to go into default gears.



* Both DTC U0100 in the TCM and DTC U0101 in the ECM will cause the malfunction indicator lamp (MIL) to illuminate.



Conditions for Clearing the DTC



* The ECM/TCM module turns OFF the MIL after 4 consecutive ignition cycles that the diagnostic runs and does not fail.



* A current DTC clears when the malfunction is no longer present.



* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.



Diagnostic Aids



* Sometimes, while diagnosing a specific customer concern or after a repair, you may notice a history U-code present. However, there is no



associated "current" or "active" status. Loss-of- communication U-codes such as these can set for a variety of reasons. Many times, they are



transparent to the vehicle operator and technician, and/or have no associated symptoms. Eventually, they will erase themselves automatically



after a number of fault-free ignition cycles. This condition would most likely be attributed to one of these scenarios:



- A control module on the data communication circuit was disconnected while the communication circuit is awake.



- Power to one or more control modules was interrupted during diagnosis.



- A low battery condition was present, so some control modules stop communicating when battery voltage drops below a certain threshold.



- Battery power was restored to the vehicle and control modules on the communication circuit did not all re-initialize at the same time.



- If a loss-of-communication U-code appears in history for no apparent reason, it is most likely associated with one of the scenarios above.



These are all temporary conditions and should never be interpreted as an intermittent fault, causing you to replace a part.



* A control module may have a U-code stored in history that does not require any repairs. Issues with late or corrupted messages between



control modules can be temporary with no apparent symptom or complaint; this does not mean the control module is faulty. Do not replace a



control module based only on a history U-code.



* Do not replace a control module reporting a U-code. The U-code identifies which control module needs to be diagnosed for a communication



issue.



* Communication may be available between the BCM and the scan tool with either the low or high speed GMLAN serial data system



inoperative. This condition is due to the BCM using both the low and high speed GMLAN systems.



* Use Data Link References (See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Initial



Inspection and Diagnostic Overview) to determine if the control module uses high or low speed GMLAN serial data communications.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1349

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1349



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) ()



* Catalytic Converter Replacement - Left Side (LF1) ()



* Catalytic Converter Replacement - Right Side (LF1) ()



P0442



DTC P0442



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 Descriptor



DTC P0442



- Evaporative Emission System Small Leak Detected



Circuit/System Description



The engine off natural vacuum test is the small leak detection diagnostic for the evaporative emission system. This diagnostic tests the evaporative



emission system for a small leak when the key is turned OFF and the correct conditions are met. Heat from the exhaust system is transferred into



the fuel tank while the vehicle is operating. When the vehicle is turned OFF and the evaporative emission system is sealed a change in the fuel tank



vapor temperature occurs which results in a corresponding pressure change in the fuel tank vapor space. This change is monitored by the ECM



using the fuel tank pressure sensor input. With a leak in the system, the amount of pressure change will be less than that of a sealed system.



Conditions for Running the DTC



* DTCs P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0222, P0223, P0443, P0446, P0449,



P0451, P0452, P0453, P0454, P0455, P0461, P0462, P0463, P0464, P0496, P0502, P0503, P0608, P0641, P0651, P1516, P2101, P2119,



P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138 are not set.



* The ignition 1 voltage is between 10-16 V.



* The barometric pressure (BARO) is greater than 74 kPa.



* No fuel filling during the engine off natural vacuum test period.



* The fuel level is between 10-90 percent.



* The start-up engine coolant temperature (ECT) and the start-up intake air temperature (IAT) are between 0-40掳C (32-104掳F).



* The barometric pressure (BARO) is more than 74 kPa.



* The engine run time before engine shut-off was greater than 10 minutes.



* The drive distance before engine shut-off was more than 5 kilometers (3.1 miles).



* The ignition is OFF.



* The ambient air temperature at the end of the drive cycle is between 0-32掳C (32-93掳F).



* DTC P0442 runs once per drive cycle during the hot soak period after the ignition is turned OFF and may require up to 45 minutes to



complete. The controller will not make more than 2 test attempts per day. The time since the last completed engine off natural vacuum test



must be at least 17 hours



Conditions for Setting the DTC



* The ECM detects a leak in the evaporative emission system that is greater than a calibrated amount.



* The ECM must complete several engine off natural vacuum tests before the diagnostic can turn the MIL on or off.



Action Taken When the DTC Sets



DTC P0442 is a Type A DTC.



Conditions for Clearing the DTC



DTC P0442 is a Type A DTC.



Diagnostic Aids



* The evaporative emission system can be filled with smoke more quickly and completely by opening the system opposite the end where the



smoke is injected. When injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is



observed then close the system and continue testing.



* To help locate intermittent leaks using the J 41413-200 - EEST , move all evaporative emission components while observing smoke with the



J 41413-SPT - White Light.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1067

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1067



Temperature Versus Resistance - Intake Air Temperature Sensor (See: Powertrain Management/Computers and Control



Systems/Specifications/Temperature Versus Resistance - Intake Air Temperature Sensor).



* If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3掳C (5掳F).



* After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.



* High resistance in the circuits of either the ECT or IAT sensor could set a DTC.



* A short to ground or voltage through a conductive material or fluid could set this DTC. Inspect the ECT sensor for evidence of engine



coolant leaking into the connector body.



Reference Information



Schematic Reference



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



(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



DTC Type Reference



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Note: Diagnose DTC P050C first.



1. Verify that DTC P0117, P0118, or P0119 is not set.



瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code



Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).



2. Inspect the engine coolant level. Verify that the cooling system is operating correctly.



瀚慖f you suspect a condition with engine cooling system, refer to Loss of Coolant (See: Engine, Cooling and Exhaust/Cooling



System/Testing and Inspection/Symptom Related Diagnostic Procedures/Loss of Coolant).



3. Ignition ON, verify the DTC P0116 or P050C Freeze Frame Start-Up ECT and the Start Up IAT parameters are within 10掳C (50掳F).



4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the



conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.



2. Ignition OFF, remove the fuse that supplies B+ to circuit terminal 56 X2 of the K20 ECM.



Caution: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current



draw.



Note: The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.



3. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.



瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests



normal, replace the K20 ECM.



4. Install the fuse that supplies B+ to circuit terminal 56 X2 of the K20 ECM.



5. Ignition ON, verify that the scan tool ECT sensor parameter is at -40掳C (-40掳F).

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1652

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1652



* The TCM detects the error current less than 50 mA for 2.75 ms.



P0970, P0971



* DTCs P0970 and P0971 are Type B DTCs.



* The current consumption of the SLC2 control circuit is 0.1-1.1 A for 500 ms.



Diagnostic Aids



When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure



a 3掳C (5掳F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.



Reference Information



Schematic Reference



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



Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Description and Operation



Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and



Operation/AF40-6 - Automatic Transmission/Transmission Component and System Description)



DTC Type Reference



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



1. Ensure the transmission fluid temperature is between 50-80掳C (122-176掳F).



2. Operate the vehicle in 2nd gear long enough to ensure at least a 3掳C (5掳F) rise in transmission fluid temperature, then operate the vehicle in



Park for 5 s.



3. Observe the scan tool Clutch Pressure Control Solenoid Valve 2 Current parameter, the reading should be between 0.1-1.1 A.



Circuit/System Testing



Command the Clutch Pressure Control Solenoid Valve 2 with a scan tool. The value should change from 0.0-1.0 A.



If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference



circuit terminal 18 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 17 X2 at the K71 Transmission



Control Module. Command the Clutch Pressure Control Solenoid Valve 2 with a scan tool. The test lamp has to illuminate brighter with increasing



current.



If the test lamp always illuminate or always does not illuminate, replace the K71 Transmission Control Module.



Component Testing



Static Test



1. Ignition OFF, remove the K71 Transmission Control Module.



2. Test for 5-5.6 ohm at 20掳C (68掳F) between the low reference circuit terminal 18 X2 and the voltage supply circuit terminal 17 X2.



瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27B Pressure Control



Solenoid Valve 2.



3. Test for infinite resistance between each terminal and the low reference circuit terminal 18 X2 and also to the voltage supply circuit terminal