Page 5561 of 6000

6E–132
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1404 (Flash DTC 31)
EGR VSV Circuit
060RW135
Circuit Description
The Engine control module (ECM) monitors the EGR
valve input to ensure that the valve responds properly to
commands from the ECM, and to detect a fault if VSV is
stuck open. When the VSV is fixing at closed and opening
the ECM will set DTC P1404.
Diagnostic Aids
Check for the following conditions:
Poor connection or damaged VSV–inspect the wiring
harness for damage.
DTC P1404 – EGR VSV Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Ignition “ON”, engine “OFF”, review and record
scan tool Failure Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a scan tool, monitor “Specific DTC” info for
DTC P1404 until the DTC P1404 test runs. Note the
result.
Does the scan tool indicates DTC P1404 failed this
ignition?
—Go to Step 3
Refer to
Diagnostic
Aids
Page 5562 of 6000
6E–133 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1404 – EGR VSV Circuit
StepNo Ye s Va l u e ( s ) Action
3Check the VSV circuit.
Was the VSV circuit open or darmage?
—Go to Step 4Go to Step 5
4Repair the opened VSV circuit or VSV.
Is the action complete?
—Verify repair—
Page 5563 of 6000

6E–134
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0405 (Flash DTC 26)
EGR Pressure Sensor Low Voltage
060RW134
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp
(MIL) as soon as failure detected.
The ECM will store conditions which were present
w h e n t h e D T C w a s s e t a s F r e e z e F r a m e a n d i n F a i l u r e
Records data.
Conditions for Clearing the MIL/DTC
DTC P0405 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the ECM
battery feed.
Diagnostic Aids
Check for the following conditions:
Poor connection or damaged harness – Inspect the
wiring harness for damage.
DTC P0405 – EGR Pressure Sensor Low Voltage
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Put the engine into an idling status.
Is the EGR pressure sensor voltage value displayed on
the Tech 2 below the specified value?
0.25 VGo to Step 3
Refer to
Diagnostic
Aids
andSymp
tom
Diagnosis
Page 5564 of 6000

6E–135 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0405 – EGR Pressure Sensor Low Voltage
StepNo Ye s Va l u e ( s ) Action
31. Turn off the ignition switch.
2. Remove the sensor connector connection.
3. Jumper between harness pins “red” and “blue”
wires.
4. Turn on the ignition switch “ON”.
Is the EGR pressure sensor voltage reading above the
specified value?
4 VGo to Step 5Go to Step 4
41. Turn off the ignition switch.
2. Remove the jumper wire.
3. Connect the relay & solenoid checker
(5-8840-0386-0) to the battery voltage, then check
the EGR pressure sensor signal circuit (blue wire).
4. Turn on the ignition switch.
Is the value displayed on the Tech 2 above the specified
value?
4 VGo to Step 6Go to Step 7
5Check the terminal connection at the EGR pressure
sensor and repair or replace terminal if necessary.
Is the action complete?
—Verify repair—
6Repair the 5V power circuit (red) harness or Replace
the ECM (Refer to the Data Programming in Case of
ECM change).
Is the action complete?
—Verify repair—
7Repair the signal circuit (blue) harness or Replace the
ECM (Refer to the Data Programming in Case of ECM
change).
Is the action complete?
—Verify repair—
Page 5565 of 6000

6E–136
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1405 (Flash DTC 37)
EGR EVRV Circuit Open/Short
060RW135
Circuit Description
EGR EVRV Circuit has a common power source in
parallel with EGR, VSV, RPCV, and Intake Throttle Motor.
This may cause multiple DTCs. On such occasion, refer
to “Multiple ECM Information Sensor DTCs Set”.
Action Taken When the DTC Sets
The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
DTC P1405 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside the
insulation. Check for:
Poor connection – Inspect the ECM harness and
connectors for improper mating, broken locks,
improperly formed or damaged terminals, and poor
terminal-to-wire connection.
Damaged harness – Inspect the wiring harness for
damage.
Page 5566 of 6000

6E–137 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1405 – EGR EVRV Circuit Open/Short
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Review and record Failure Records information.
2. Clear DTC P1405.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.
Is DTC P1405 set?
—Go to Step 3
Refer to
Diagnostic
Aid
31. Ignition “OFF.”
2. Disconnect the EVRV.
3. Check for an open or a short to ground in the EVRV
circuit between the EVRV connector and the ECM
harness connector.
4. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 4
4Check the connections at the EVRV and replace the
terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 5
5Check the connections at the ECM and replace the
terminals if necessary.
Did any terminals require replacement?
—Verify repair Go to Step 6
6Replace the EVRV.
Is the action complete?
—Verify repairGo to Step 7
7Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—
Page 5567 of 6000

6E–138
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0406 (Flash DTC 26)
EGR Pressure Sensor High Voltage
060RW134
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp
(MIL) as soon as failure detected.
The ECM will store conditions which were present
w h e n t h e D T C w a s s e t a s F r e e z e F r a m e a n d i n F a i l u r e
Records data.
Conditions for Clearing the MIL/DTC
DTC P0404 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the ECM
battery feed.
Diagnostic Aids
Check for the following conditions:
Poor connection or damaged harness – Inspect the
wiring harness for damage.
DTC P0406 – EGR Pressure Sensor High Voltage
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Put the engine into an idling status.
Is the EGR pressure sensor voltage value displayed on
the Tech 2 above the specified value?
4 VGo to Step 3Go to Step 4
31. Turn off the ignition switch.
2. Remove the sensor connector connection.
3. Turn on the ignition switch “ON”.
Is the EGR pressure sensor voltage value displayed on
the Tech 2 below the specified value?
1 VGo to Step 5Go to Step 6
Page 5568 of 6000
6E–139 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0406 – EGR Pressure Sensor High Voltage
StepNo Ye s Va l u e ( s ) Action
4Is the EGR pressure sensor voltage value displayed on
the Tech 2 below the specified value?
1 V
Refer to
Chart P0107
Refer to
Diagnostic
Aids
andSymp
tom
Diagnosis
5Connect the relay and solenoid checker
(5-8840-0386-0) to the battery voltage, then check the
sensor grounding circuit.
Does the checker lamp come on?
—Go to Step 7Go to Step 8
6A voltage short circuit occurs in the MAP signal circuit
or this circuit is shorted with the 5V power circuit.
Repair the harness or Replace the ECM (Refer to the
Data Programming in Case of ECM change).
Is the action complete?
—Verify repair—
7Replace the EGR pressure sensor hose or the EGR
pressure sensor.
Is the action complete?
—Verify repair—
8Repair the harness for open ground circuit.
Is the action complete?
—Verify repair—