The MIL is ON With No DTC Set
Bulletin No.: 003/93Issued: 4/14/93
Revised:
Category
F
Applicable Model/s
1990-91 MX6/626
(Turbo-Federal Only)
Subject:
INCORRECT MIL SIGNAL
AFFECTED VINS
Japan-built:
This bulletin applies to 1990-91 turbo vehicles with a VIN range of JM1GD****L1800014 to M1917432 and produced through June 30, 1991.
This bulletin does not apply to 1991 turbo vehicles with a VIN equal to or greater than JM1GD****M1917433 and produced after June 30, 1991.
U.S.-built:
This bulletin applies to 1990-91 turbo vehicles with a VIN range of 1YVGD****L5100125 to M5146082 and produced through June 30, 1991.
This bulletin does not apply to 1991 turbo vehicles with a VIN equal to or greater than 1YVGD**** M5146083 and produced after June 30, 1991.
DESCRIPTION
The Malfunction Indicator Light (MIL) lights when no fault is present. This may occur because the output voltage of the position sensor of the EGR valve varies. The voltage varies according to the amount of carbon deposited on the seat of the EGR valve.
INSPECTION AND REPAIR PROCEDURE
If you encounter a vehicle with this condition, replace the plate at the position sensor of the EGR valve according to the following procedure.
1. Remove the vacuum hose from the EGR valve. Figure 1
2. Check if the MIL is on when the SST harness (SST/No.: 49-G018-901) is installed and the ignition switch is ON. Figure 2
Next, check each terminal voltage with the chart.
If the MIL is on and/or the voltage between terminals A and C is greater 1.1 V., proceed with the repair procedure.
3. Remove the EGR valve from the engine. For details, see the Workshop Manual, Section F.
4. Loosen the two screws on the position sensor of the EGR valve. Figure 3
NOTE:
Be careful not to damage the slots of the screws while removing them.
5. Remove the "O" ring (brown) between the position sensor and the diaphragm case.
6. Remove the dirt between the position sensor and the diaphragm case. Figure 4
7. Install the new "O" ring from the repair kit by sliding it down to the groove on the flange part. Figure 5
NOTE:
When installing the "O" ring, be careful not to twist or otherwise damage it.
8. Install the new plate from the repair kit and reinstall the position sensor on the EGR valve. Figure 6
9. Check the voltage values (see step 2) and compare them with the chart. Also check to see that the MIL is off.
10. Disconnect the SST harness and reconnect the coupler to the sensor.
11. Apply 600 mm Hg of vacuum to the EGR valve with a vacuum tester. Confirm that the valve holds more than 500 mm Hg for longer than one minute. Figure 7
12. Re-install the EGR valve on the engine.
13. Reconnect the vacuum hose.
PARTS INFORMATION
PART NUMBER DESCRIPTION
F2Y8-13-SJO Plate Set
WARRANTY INFORMATION
Symptom Code: 62
Damage Code: 93
Part No. of Main Cause: F2Y8-13-SJO
Operation No.: XX0537RX
Labor Hours: 0.6