DTC P06C5-P06C9 or P06CA
Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5830104 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P06C5 Cylinder 1 Glow Plug Incorrect DTC P06C6 Cylinder 2 Glow Plug Incorrect DTC P06C7 Cylinder 3 Glow Plug Incorrect DTC P06C8 Cylinder 4 Glow Plug Incorrect DTC P06C9 Cylinder 5 Glow Plug Incorrect DTC P06CA Cylinder 6 Glow Plug Incorrect Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performanc |
|---|---|---|---|---|
| Control — Terminal 1/A @ E12A Glow Plug 1 | P066A, P06C5 | P0671, P06C5 | P066B | P06C5 |
| Control — Terminal 1/A @ E12B Glow Plug 2 | P066C, P06C6 | P0672, P06C6 | P066D | P06C6 |
| Control — Terminal 1/A @ E12C Glow Plug 3 | P066E, P06C7 | P0673, P06C7 | P066F | P06C7 |
| Control — Terminal 1/A @ E12D Glow Plug 4 | P067A, P06C8 | P0674, P06C8 | P067B | P06C8 |
| Control — Terminal 1/A @ E12E Glow Plug 5 | P067C, P06C9 | P0675, P06C9 | P067D | P06C9 |
| Control — Terminal 1/A @ E12F Glow Plug 6 | P067E, P06CA | P0676, P06CA | P067F | P06CA |
Circuit/System Description For an overview of the component/system, refer to: Glow Plug System Description
| Circuit | Description |
|---|---|
| Control | The output circuit is switched to 10 V to activate the component. When the output is commanded On, the voltage can range between 4.7 and 10 V. The output is PWM controlled. |
| Component | Description |
|---|---|
| E12 Glow Plug | Glow plugs are electric heating devices in the combustion chambers of diesel engines. |
| K20 Engine Control Module | The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly. |
Conditions for Running the DTC DTC P037E, P037F, P66A–P066F, P0671–P0676, P067A–P067F = Not set Engine = Running Ignition and Start Signal = Greater than 11 V Glow Plug Command = ON Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Glow Plug — Resistance = Not within a calibrated range Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification
- Ignition » On / Vehicle » In Service Mode
- Verify DTC P06C5–P06CA is not set. ⇒ If DTC P06C5–P06CA is set Refer to: Circuit/System Testing ⇓ If DTC P06C5–P06CA is not set
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
- All OK. Circuit/System Testing
- Ignition/Vehicle » Off
- Disconnect the appropriate electrical connector: E12 Glow Plug
- Ignition » On / Vehicle » In Service Mode
- Connect a test lamp between the test points: Control circuit terminal 1/A & Ground
- Perform the scan tool control function: Glow Plugs » On and Off Verify the test lamp turns On and Off. ⇒ If the test lamp is always Off 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Disconnect the electrical connector: X1 @ K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Control circuit terminal 1/A @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.4. Test for less than 2 Ω between the test points: Control circuit terminal 1/A @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If the test lamp is always On 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Disconnect the electrical connector: X1 @ K20 Engine Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: Control circuit terminal 1/A @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If the test lamp turns On and Off
- Test or replace the component: E12 Glow Plug Component Testing
- Ignition/Vehicle » Off
- Disconnect the appropriate electrical connector: E12 Glow Plug
- Test for less than 1.8 Ω between the test points: Control terminal 1/A & The component’s housing ⇒ If 1.8 Ω or greater Replace the component: E12 Glow Plug ⇓ If less than 1.8 Ω
- All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Glow Plug Replacement - Cylinder 1 Glow Plug Replacement - Cylinder 2 Glow Plug Replacement - Cylinder 3 Glow Plug Replacement - Cylinder 4 Glow Plug Replacement - Cylinder 5 Glow Plug Replacement - Cylinder 6 For control module replacement, programming, and setup refer to: Control Module References