Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5591380
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 P04CF
Exhaust Gas Recirculation Temperature Sensor 3 Performance
DTC P04D0
Exhaust Gas Recirculation Temperature Sensor 3 Circuit Low
DTC P04D1
Exhaust Gas Recirculation Temperature Sensor 3 Circuit High
DTC P04D2
Exhaust Gas Recirculation Temperature Sensor 3 Circuit Erratic
Diagnostic Fault Information
| Circuit |
Short to Ground |
Open/High Resistance |
Short to Voltage |
Signal Performanc |
| Signal |
P04D0 |
P04D1 |
P04D1 |
P04CF |
| Signal |
P04D0 |
P04D1 |
P04D1 |
P04CF |
Circuit/System Description
For an overview of the component/system, refer to: Exhaust Gas Recirculation (EGR) System
Description
| Circuit |
Description |
| Signal |
The control module input circuit has an internal resistance connected to 2.4 V. |
| Signal |
The control module input circuit has an internal resistance connected to 1 V. |
|
Component |
Description |
|
|
B130 Exhaust Gas Recirculation Temperature Sensor |
The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature. The input voltage varies depending on the temperature of the sensor. |
|
|
K20 Engine Control Module |
The control module contains a microprocessor used |
|
|
© 2023 General |
Mtoo tporros.c e Assll irnigphutts d raetsae rtove cdo.ntrol outputs. |
|
| Component |
Description |
|
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
P04CF
DTC P262B = Not set
DTCs related to the following system/component = Not Set
– B48 Fuel Temperature Sensor
– B65 Intake Manifold Pressure and Air Temperature Sensor
No other DTCs related to the concerned component are set.
Engine = Running
Engine Off Time = Greater than 8 h
Fuel Temperature Sensor & Manifold Absolute Pressure Sensor = Within 45°C (81°F) of each
other
Ignition Voltage = Greater than 11 V
Frequency the DTC runs = Continuously — After the running conditions are met
P04D0, P04D1
Ignition = On
Ignition Voltage = Greater than 11 V
Frequency the DTC runs = Continuously — After the running conditions are met
P04D2
No other DTCs related to the concerned component are set.
Engine = Running
Ignition Voltage = Greater than 11 V
Frequency the DTC runs = Continuously — After the running conditions are met
Conditions for Setting the DTC
P04CF
Exhaust Gas Recirculation Temperature Sensor 3 = The temperature does not change within a
predetermined time. — After the engine has been Off for 8 h
P04D0
Exhaust Gas Recirculation Temperature Sensor 3 = Warmer than 299°C (570°F) — For greater
than 5 s
P04D1
Exhaust Gas Recirculation Temperature Sensor 3 = Colder than −39°C (−38°F) — For greater
than 5 s
P04D2
Exhaust Gas Recirculation Temperature Sensor 3 = Intermittent — For greater than 1 s
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
Diagnostic Aids
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add
dielectric grease or lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087).
This procedure may correct the high resistance condition due to terminal fretting corrosion.
The following parameters are not within 3°C (5°F) of each other: — After the engine has been Off
for 8 h
Exhaust Gas Recirculation Temperature Sensor 3
Engine Coolant Temperature Sensor
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 the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor 3 = −39 to
299°C (−38 to 570°F) and changes
⇒ If not between −39 and 299°C (−38 and 570°F) or does not change
Refer to: Circuit/System Testing
⇓ If between −39 and 299°C (−38 and 570°F) and changes
- Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor 3 = The value
should not spike or drop out.
Perform the action while monitoring the parameter:
Wiggle the harness and connector: B130C Exhaust Gas Recirculation Temperature
Sensor 3
Wiggle the harness and connector: X2 @ K20 Engine Control Module
⇒ If the value spikes or drops out
Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)
⇓ If the value does not spike or drop out
- 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 & All vehicle systems » Off
- Disconnect the electrical connector: B130C Exhaust Gas Recirculation Temperature Sensor 3
- Ignition » On / Vehicle » In Service Mode
- Test for 0.5 to 5 V between the test points: Terminal 2 & Ground
⇒ If greater than 5 V
4.1. Ignition/Vehicle » Off
4.2. Disconnect the electrical connector: K20 Engine Control Module
4.3. Test for less than 1 V between the test points: Terminal 2 @ 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 less than 0.5 V
4.1. Ignition/Vehicle » Off
4.2. Disconnect the electrical connector: K20 Engine Control Module
4.3. Test for infinite resistance between the test points: Terminal 2 @ Component harness &
Ground
⇒ If less than infinite resistance » Repair the short to ground on the circuit.
⇓ If infinite resistance
4.4. Test for less than 2 Ω between the test points: Terminal 2 @ Component harness &
Terminal 11 X2 @ 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 between 0.5 and 1.5 V
- Ignition » On / Vehicle » In Service Mode
- Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor & Exhaust Gas
Recirculation Temperature Sensor 3 = Colder than −39°C (−38°F)
⇒ If −39°C (−38°F) or warmer
6.1. Ignition/Vehicle » Off
6.2. Disconnect the electrical connector: K20 Engine Control Module
6.3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component
harness & Ground
⇒ If less than infinite resistance » Repair the short to ground on the circuit.
⇒ If infinite resistance » Replace the component: K20 Engine Control Module
⇓ If colder than −39°C (−38°F)
- Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground
- Verify the scan tool parameter: Exhaust Gas Recirculation Temperature Sensor & Exhaust Gas
Recirculation Temperature Sensor 3 = Warmer than 299°C (570°F)
⇒ If 299°C (570°F) or colder
8.1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
8.2. Disconnect the electrical connector: K20 Engine Control Module
8.3. Ignition » On / Vehicle » In Service Mode
8.4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component
harness & Ground
⇒ If 1 V or greater » Repair the short to voltage on the circuit.
⇓ If less than 1 V
8.5. Ignition/Vehicle » Off
8.6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component
harness & Terminal 39 X2 @ 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 warmer than 299°C (570°F)
- Test or replace the component: B130C Exhaust Gas Recirculation Temperature Sensor 3
Component Testing
- Ignition/Vehicle » Off
- Disconnect the appropriate electrical connector: B130C Exhaust Gas Recirculation Temperature
Sensor 3
- Test the resistance between the test points: Terminal 1 & Terminal 2 @ Component
- Verify the value is within the range listed in the table: Temperature Versus Resistance
⇒ If not in the specified range
Replace the component: B130C Exhaust Gas Recirculation Temperature Sensor 3
⇓ If in the specified range
- Test for infinite resistance between the test points: Each terminal of the component & The
component’s housing
⇒ If less than infinite resistance
Replace the component: B130C Exhaust Gas Recirculation Temperature Sensor 3
⇓ If infinite resistance
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair
Verification
Exhaust Gas Recirculation Cooler Temperature Sensor Replacement - Position 2 — B130C
Exhaust Gas Recirculation Temperature Sensor 3
For control module replacement, programming, and setup refer to: Control Module
References