DTC P1407 (LPL or LPV)
Diagnostic Instructions
DTC Descriptor
DTC P1407: Exhaust Gas Recirculation (EGR)
Motor Control Circuit Shorted |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Control
|
P1407 00
|
P0403 00
|
P1407
|
P0404 00
|
Ground
|
-
|
-
|
-
|
-
|
|
|
Circuit/System Description
The exhaust gas recirculation (EGR) valve is controlled by the
engine control module (ECM) through the EGR solenoid. A reference
voltage is supplied to the EGR valve solenoid. The ECM controls the
solenoid by grounding the control circuit.
Conditions for Running the DTC
• |
The ignition is ON, or the
engine is running. |
• |
The DTCs run continuously when
the above conditions are met. |
Conditions for Setting the DTC
P1407
The ECM detects an short to voltage on the control circuit.
Action Taken When the DTC Sets
DTC P1407 is a Type B DTC.
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
Circuit/System Verification
1. |
Ignition ON, observe the DTC
information with a scan tool. Verify that no other DTCs are
set. |
2. |
Operate the vehicle within the
Conditions for Running the DTC to verify the DTC does not reset.
You may also operate the vehicle within the conditions that you
observed from the Freeze Frame/Failure Records data. |
Circuit/System Testing
1. |
Ignition OFF, disconnect the
harness connector at the Q14 Exhaust Gas Recirculation Valve and
K20 Engine Control Module. |
2. |
Test for greater than 500
kΩ between the low reference circuit terminal 6 at the Q14
Exhaust Gas Recirculation Valve and earth. |
⇒ |
If less than the specified range, test the low
reference circuit for a short to ground. |
3. |
Test for less than 5 Ω
between the low reference circuit terminal 6 at the Q14 Exhaust Gas
Recirculation Valve and the low reference circuit terminal 72 X2 at
the K20 Engine Control Module. |
⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. |
4. |
Connect the harness connector
X2 to the K20 Engine Control Module. |
5. |
Ignition ON, test for greater
than 11 V between the control circuit terminal 4 at the Q14 Exhaust
Gas Recirculation Valve and ground. |
⇒ |
If less than the specified range, test the control
circuit for a short to ground or an open/high resistance. |
6. |
If all circuits test normal,
test or replace the Q14 Exhaust Gas Recirculation Valve.
|
7. |
Connect the harness connector
to the Q14 Exhaust Gas Recirculation Valve. Clear the DTC
information and operate the vehicle within the conditions for
running the DTC. |
⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|