2010 Cadillac Truck SRX FWD V6-3.0L Page 1186
Circuit/System Description
The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) monitors the ignition
voltage from the fuse of each bank of coils to the ECM. The ECM uses this information to determine if the misfire is ignition coil voltage related.
Conditions for Running the DTC
* The ignition is ON.
* The ignition module supply voltage is less than 2.5 V.
* The DTCs run continuously when the above condition is met.
Conditions for Setting the DTC
The ECM detects a fault in an ignition coil control circuit for 50 out of 63 samples. Each sample runs on a 6.25 ms loop.
Action Taken When the DTC Sets
DTCs P135A and P135B are Type A DTCs.
Conditions for Clearing the DTC
DTCs P135A and P135B are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
* Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Electronic Ignition System Description)
* Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine
Control Module Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* 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
Engine Control Module Scan Tool Information (LF1,LFW) (See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures)Engine Control Module Scan Tool Information (LAU) (See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures) for scan tool information
Circuit/System Verification
With the ignition ON, observe the following scan tool parameters for each cylinder:
* Ignition Coil Supply Voltage Bank 1
