DTC P245A-P245D
Diagnostic Instructions
DTC Descriptors
| DTC P245A 00: Exhaust Gas Recirculation (EGR)
Cooler Bypass Solenoid Valve Control Circuit Open |
| DTC P245B 00: Exhaust Gas Recirculation (EGR)
Cooler Bypass Solenoid Valve Control Circuit Malfunction |
| DTC P245C 02: Exhaust Gas Recirculation (EGR)
Cooler Bypass Solenoid Valve Control Circuit Short to Ground |
| DTC P245D 01: Exhaust Gas Recirculation (EGR)
Cooler Bypass Solenoid Valve Control Circuit Short to Battery |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition
|
P245A 00
|
P245A 00
|
-
|
-
|
Output Control
|
P245C 02
|
P245A 00
|
P245D 01
|
P245B 00
|
|
| |
Circuit/System Description
The exhaust gas recirculation (EGR) cooler bypass solenoid valve
is controlled by the engine control module (ECM). At engine cold
start, the EGR cooler bypass allows hot exhaust gas to heat the
intake air in the manifold. Once the engine operating temperature
is reached, the ECM will close the EGR cooler bypass.
Conditions for Running the DTC
Ignition is on.
Conditions for Setting the DTC
P245A 00
The ECM detects an open in the output circuit.
P245B 00
The ECM detects a high resistance at the output circuit.
P245C 02
The ECM detects a short to ground at the output circuit.
P245D 01
The ECM detects a short to battery at the output circuit.
Action Taken When the DTC Sets
DTCs P245A - P245D are Type C DTCs.
Conditions for Clearing the DTC
DTCs P245A - P245D are Type C DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EN 23738-A Mityvac
Circuit/System Verification
| 1. |
Disconnect the vacuum source
from the EGR Cooler Bypass valve. |
| 2. |
Connect the EN
23738-A Mityvac to the EGR Cooler Bypass valve vacuum
supply hose. Engine running, verify the vacuum is greater than -50
kPa (-7.25 PSI). |
| ⇒ |
If less than the specified range, inspect the
vacuum supply hose and filter for a leak or restriction. If the
supply hose is normal, replace the vacuum pump. |
| 3. |
Connect the vacuum source to
the EGR Cooler Bypass valve. Connect the EN 23738-A
Mityvac to the EGR Cooler Bypass valve vacuum port on the EGR
Cooler Bypass valve. Engine running, command the EGR Cooler Bypass
valve OFF with a scan tool. Verify the vacuum is at 0 kPa (0
PSI). |
| ⇒ |
If greater than the specified range, replace the
EGR Cooler Bypass valve. |
| 4. |
Command the EGR Cooler Bypass
valve ON with a scan tool. Verify the vacuum is greater than -50
kPa (-7.25 PSI). |
| ⇒ |
If less than the specified range, replace the EGR
Cooler Bypass valve. |
| 5. |
If all other components test
normal, test or replace the EGR Cooler Bypass valve. |
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the Q47 Exhaust Gas Recirculation Cooler
Bypass Solenoid Valve. |
| 2. |
Ignition ON, verify that a
test lamp illuminates between the ignition circuit terminal 2 and
ground. |
| ⇒ |
If the test lamp does not illuminate, test the
ignition circuit for a short to ground or an open/high resistance.
If the circuit tests normal and the ignition circuit fuse is open,
test or replace the Q47 Exhaust Gas Recirculation Cooler Bypass
Solenoid Valve. |
| 3. |
Command the EGR Cooler Bypass
Valve OFF with a scan tool, verify that a test lamp does illuminate
weakly between the ignition circuit terminal 2 and the control
circuit terminal 1. |
| ⇒ |
If the test lamp illuminates brightly, test the
control circuit for a short to ground. |
| 4. |
Command the EGR Cooler Bypass
valve ON with a scan tool. Verify the test lamp illuminates
brightly. |
| ⇒ |
If the test lamp is always off, test the control
circuit for an open circuit or short to voltage. If the circuit
tests normal, replace the K20 Engine Control Module. |
| 5. |
If all circuits test normal,
test or replace the Q47 Exhaust Gas Recirculation Cooler Bypass
Solenoid Valve. |
Component Testing
Static Test
| 1. |
Ignition OFF, disconnect the
harness connector at the Q47 Exhaust Gas Recirculation Cooler
Bypass Solenoid Valve. |
| 2. |
Test for 25-35 Ω between
the control terminal 1 and the ignition terminal 2 of the Q47
Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
|
| ⇒ |
If not within the specified range, replace the Q47
Exhaust Gas Recirculation Cooler Bypass Solenoid Valve. |
| 3. |
Test for infinite resistance
between each terminal and the Q47 Exhaust Gas Recirculation Cooler
Bypass Solenoid Valve. |
| ⇒ |
If not the specified value, replace the Q47
Exhaust Gas Recirculation Cooler Bypass Solenoid Valve. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Exhaust Gas Recirculation Valve Cooler Replacement
|
