2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1836
* B107 APP sensor 1 terminal 4
* B107 APP sensor 2 terminal 5
瀚慖f greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the
circuit/connections test normal, replace the K20 ECM.
Note: The 5-volt reference circuit voltage can be within the specified range with a high resistance in the circuit. If this condition is
suspected, refer to Diagnostic Aids.
3. Ignition ON, test for 4.8-5.2 V between the appropriate 5-volt reference circuit listed below and ground.
* B107 APP sensor 1 terminal 2
* B107 APP sensor 2 terminal 1
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test
normal, replace the K20 ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the
K20 ECM.
4. Observe the scan tool APP sensor 1 voltage parameter. Verify the voltage is less than 0.3 V.
瀚慖f greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit/connections test normal, replace the
K20 ECM.
5. Observe the scan tool APP sensor 2 voltage parameter. Verify the voltage is less than 0.3 V.
瀚慖f greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit/connections test normal, replace the
K20 ECM.
6. Connect a 3 A fused jumper wire between the APP sensor 1 signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the
APP sensor 1 voltage parameter is greater than 4.8 V.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test
normal, replace the K20 ECM.
7. Connect a 3 A fused jumper wire between the APP sensor 2 signal circuit terminal 6 and the 5-volt reference circuit terminal 1. Verify the
APP sensor 2 voltage parameter is greater than 4.8 V.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test
normal, replace the K20 ECM.
8. If all circuits/connections test normal, test or replace the B107 accelerator pedal assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Accelerator Pedal with Position Sensor Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Accelerator
Pedal/Service and Repair/Accelerator Pedal with Position Sensor Assembly Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement,
programming, and setup
P2128
DTC P2122, P2123, P2127, P2128, or P2138 (Without LF1, LFW)
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 P2122
- Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage
