2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1842
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.
瀚慖f a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU) ( See: P Code Charts/P0641/ECM).
2. Observe the scan tool APP Sensor voltage parameters. Verify both of the APP sensor voltages are between 0.4-4.5 V.
3. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure
several times. DTCs P2122, P2123, P2127, P2128, or P2138 should not set.
4. Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTCs
P2122, P2123, P2127, P2128, or P2138 should not set.
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
1. Disconnect the harness connector at the B107 accelerator pedal assembly.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm
between the appropriate low reference circuit listed below and ground.
* 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.
