P0403
EGR Solenoid Circuit:
Connector; C-51 <M/T>, C-52 <A/T>:
TECHNICAL DESCRIPTION
- The EGR solenoid power is supplied from the MFI relay (terminal 1).
- The ECM
BACKGROUND
- The ECM
DTC SET CONDITIONS
Check Conditions
- Battery positive 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"
- 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.
- ECM failed.
- PCM failed.
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
STEP 1. Using scan tool MB991502, actuator test item 10: EGR Solenoid.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to the actuator test mode for item 10, EGR solenoid.
- A Clicking sound and vibration should be noticed when the EGR solenoid is driven.
If a clicking sound is heard, this malfunction is intermittent.
Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction. If a clicking sound is not heard, go to Step 2.
STEP 2. Check the power supply line at EGR solenoid connector B-31.
1. Disconnect connector B-31 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 1 and ground.
- Voltage should be battery positive voltage.
4. Turn the ignition switch to "LOCK" (OFF) position. If within specifications, go to Step 3.
If not within specifications, repair the harness wire between the MFI relay connector A-21X and EGR solenoid connector B-31. Then go to Step 7.
STEP 3. Check the EGR solenoid.
1. Disconnect the vacuum hose from the EGR solenoid.
NOTE: When disconnecting the vacuum hose always make sure that it can be reconnected in its original position.
2. Disconnect the harness connector.
3. Measure the resistance between the terminal of the EGR solenoid.
Standard value: 29 - 35 ohms [at 20°C (68°F)]
4. Connect a hand vacuum pump to nipple (A) of the EGR solenoid. (Refer to the illustration at left.)
5. Check air tightness by applying a vacuum with voltage applied directly from the battery to the EGR solenoid and without applying voltage.
If within specifications, go to Step 4.
If not within specifications, replace the EGR solenoid. Then go to Step 7.
STEP 4. Check harness connector B-31 at the EGR solenoid for damage.
If harness connector B-31 is in good condition, go to Step 5.
If harness connector B-31 is damaged, repair or replace it.
Refer to Harness Connector Inspection. Then go to Step 7
STEP 5. Check the circuits at ECM connector C-51
1. Disconnect connector C-51
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminals 6 and ground.
- Voltage should be battery positive voltage.
4. Turn the ignition switch to "LOCK" (OFF) position.
If within specifications, go to Step 6.
If not within specifications, repair the harness wires between EGR solenoid connector B-31 and ECM connector C-51
STEP 6. Check harness connector C-51 at the ECM
If harness connector C-51
If harness connector C-51
STEP 7. 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 diagnostic trouble code P0403 does not reset.