2010 Cadillac Truck SRX AWD V6-3.0L Page 1636

2010 Cadillac Truck SRX AWD V6-3.0L Page 1636

Circuit/System Testing

1. Ignition OFF, disconnect harness connector of the B47 fuel pressure sensor.

2. Ignition OFF, test for less than 1.0 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. If the circuit tests normal, replace the K27

fuel pump control module.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K27 fuel pump control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel

pump control module.

4. If all circuits test normal, replace the B47 fuel pressure sensor.

Repair Instructions

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

* Fuel Pressure Sensor Replacement - Fuel Feed Pipe (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure

Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Feed Pipe)

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

and programming

P0650

DTC P0650

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 P0650

- Malfunction Indicator Lamp (MIL) Control Circuit

Diagnostic Fault Information

Circuit/System Description

The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC). The MIL informs the driver that an emission system fault

has occurred and that the engine control system requires service. The engine control module (ECM) monitors the MIL control circuit for conditions

that are incorrect for the commanded state of the MIL. For example, a failure condition exists if the ECM detects low voltage when the MIL is

commanded OFF, or high voltage when the MIL is commanded ON.

Conditions for Running the DTC

* The engine speed is greater than 80 RPM.

* The ignition voltage is between 10-18 V.

* The ECM has commanded the MIL ON and OFF at least once during the ignition cycle.

* DTC P0650 runs continuously when the above conditions are met.

Conditions for Setting the DTC