2010 Cadillac Truck SRX AWD V6-3.0L Page 1251
* Switch Signal C terminal C
* Switch Signal P terminal B
瀚慖f not the specified value, replace the control solenoid valve assembly.
7. Connect a 3-amp fused jumper wire between park/neutral switch signal circuit terminal F and IMS ground circuit terminal A on the TCM
assembly. Verify the ECM PNP Switch parameter changes from IN Gear to Park/Neutral.
瀚慖f not the specified value, test the park/neutral signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
8. If all circuits test normal, replace the IMS.
Repair Instructions
Note:
* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Programming and Relearning) following all transmission related repairs.
* Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/6T70/6T75 - Automatic Transmission/Control
Solenoid Valve and Transmission Control Module Assembly Inspection) before replacing the TCM.
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (See: Powertrain Management/Computers and Control
Systems/Sensors and Switches - Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair)
* Range Selector Lever Cable Adjustment (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Shift Linkage/Shift
Cable/Adjustments)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM or control solenoid valve assembly
replacement, setup, and programming
P0191
DTC P0191 (LF1)
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 P0191
- Fuel Rail Pressure Sensor Performance
Diagnostic Fault Information
Circuit/System Description
The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on
the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM
monitors the voltage on the fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure
is low, the signal voltage is low.
Conditions for Running the DTC
Condition 1
* The engine speed is greater than 25 RPM for greater than 31 s.
