2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1965

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1965

4. Ignition OFF, connect a test lamp between the control circuit terminal D and the low reference circuit terminal A.

5. Ignition ON, command the G12 fuel pump ON with a scan tool. The test lamp should illuminate.

瀚慖f the test lamp does not illuminate, test the low reference circuit terminal A for a short to voltage or an open/high resistance. If the circuit

tests normal, replace the K27 fuel pump control module.

6. If all circuits test normal, replace the fuel tank G12 fuel pump module.

Repair Instructions

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

* Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 Gal) Tank Rear))Fuel Tank

Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 Gal) Tank Front))Fuel Tank

Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 Gal) Tank + E85))Fuel Tank

Fuel Pump Module Replacement (1500 Series) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and

Repair/Fuel Tank Fuel Pump Module Replacement (1500 Series))Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal)

Tank + E85) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module

Replacement (1500 LWB - 117.3L (31 Gal) Tank + E85))

* Control Module References (See: Testing and Inspection/Programming and Relearning)for fuel pump control module replacement, setup,

and programming

P0232

DTC P0231, P0232, or P023F

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 P0231

- Fuel Pump Control Circuit Low Voltage

DTC P0232

- Fuel Pump Control Circuit High Voltage

DTC P023F

- Fuel Pump Control Circuit

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from

the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received,

the fuel pump control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.

Conditions for Running the DTC

P0231, P023F

The ignition voltage is between 9-18 V.