2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1838

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1838

P2123

The APP sensor 1 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.

P2127

The APP sensor 2 voltage is less than 0.63 volt for greater than 1 s or for a cumulative time of 4 s.

P2128

The APP sensor 2 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.

P2138

* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.25 volts when the sensor voltages are between

1.91-1.25 V.

* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.31 volts when the sensor voltages are between

1.91-2.63 V.

* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 1.7 volts when the sensor voltages are greater than

2.63 V.

* DTC P2138 sets if any of the above conditions exist for greater than 1 s or for a cumulative time of 4 s.

Action Taken When the DTC Sets

DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.

Diagnostic Aids

Test the current output of the 5-volt reference circuits if you suspect high resistance in the circuit. The current output should be greater than 80 mA

for APP 1 and greater than 50 mA for APP 2.

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)

Description and Operation

Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Throttle Actuator Control (TAC) System 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

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. DTC P0651, P0652, P0653, P0697, P0698, or P0699 should not be set.