P0403

EGR Solenoid Circuit:

connectors:

TECHNICAL DESCRIPTION
- The EGR solenoid power is supplied from the MFI relay (terminal 1).
- The PCM controls the EGR solenoid ground by turning the power transistor in the PCM "ON" and "OFF".

BACKGROUND
- The PCM checks current flows in the EGR solenoid drive circuit when the EGR solenoid is "ON" and "OFF".

DTC SET CONDITIONS

Check Area
- Battery voltage is higher than 10 volts.

Judgment Criteria
- The EGR solenoid coil surge voltage (battery positive voltage + 2 volts) is not detected when the EGR solenoid is turned from "ON" to "OFF".
- Only one monitor during one drive cycle.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- EGR solenoid failed.
- Open or shorted EGR solenoid circuit, or loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tool
MB991502 Scan Tool (MUT-II)

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using scan tool MB991502, actuator test item 10: EGR solenoid.
- An operation sound should be heard when the EGR solenoid is driven.

If an operation sound is not heard, go to Step 2.

If an operation sound is heard, it can be assumed that this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

STEP 2. Check the EGR solenoid.
Refer to Emission Control System.

If correct, go to Step 3.

If incorrect, repair or replace. Then go to Step 6.

STEP 3. Check the power supply line at the EGR solenoid connector A-11.
1. Disconnect connector A-11 and measure at the harness side.
2. Turn the ignition switch "ON".




3. Connect terminal 1 with the ground via a 20-ohms resistor.
Measure the current at this time.
- The current should be 0.5 ampere or more.

4. Turn the ignition switch "OFF".

If within specifications, go to Step 4.

If not within specifications, check the intermediate connector C-14, and repair or replace as required. Refer to vehicle level Testing and Inspection. If the intermediate connector C-14 is in good condition, repair the harness wire between the MFI relay connector C-59 and the EGR solenoid connector A-11. Then go to Step 6.




STEP 4. Check the circuit at the PCM connector C-89.
1. Disconnect connector C-89 and check at the harness side.
2. Disconnect PCM connector C-90. Using a jumper wire, connect terminal 49 to ground and activate the MFI relay.
3. Turn the ignition switch "ON".
4. Using a jumper wire, connect the connector C-89 terminal 6 to ground and activate the EGR solenoid.
- An operation sound should be heard from the EGR solenoid.

5. Turn the ignition switch "OFF".

If an operation sound is heard, go to Step 5.

If an operation sound is not heard, repair the harness between the EGR solenoid connector A-11 and the PCM connector C-89. Then go to Step 6.




STEP 5. Check the harness connector C-89 at the PCM for damage.
If harness connector C-89 is damaged, repair or replace it.

Refer to vehicle level Testing and Inspection.

If harness connector C-89 is in good condition, replace the PCM.

Then go to step 6.

STEP 6. Test the OBD-II drive cycle
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.

2. Read the diagnostic trouble code, and confirm that a diagnostic trouble code is not being output.