S15/T15 2WD Jimmy V6-262 4.3L (1991)
THIS REVISED PROCEDURE ELIMINATES THE NEED TO MANUALLY BLEED THE EHCU. THE FUNCTION TEST WILL PURGE THE
MODULE OF ANY TRAPPED AIR.
1.
Bleed the brake system in the conventional manner using either vacuum, pressure or manual bleeding, (Refer to VACUUM, PRESSURE OR
MANUAL BLEEDING PROCEDURES). Technicians should always maintain a full master cylinder both during and after bleeding.
2. Perform THREE (3) system funtion tests. This must be done with a Tech 1 scan tool with a serial number above xx002000 along with tool number TK
2650 (4WAL cartridge, special RWAL/4WAL adapter, and harness). If a Tech 1 is not available see 4WAL Alternative Bleeding Procedure. See:
With ABS System/4WAL Alternative Bleeding Procedure
Important
DURING THE FUNCTION TEST THE BRAKE PEDAL MUST BE FIRMLY DEPRESSED. THIS WILL PURGE ANY AIR TRAPPED IN THE
EHCU HIGH PRESSURE ACCUMULATOR, LOW PRESSURE ACCUMULATOR AND PUMP CIRCUITS.
3.
Re-Bleed the vehicle brake system as instructed in step one to purge any air introduced to the brake lines from the EHCU purging.
4.
Confirm that no soft or spongy pedal action is observed. Repeat steps 1 through 4 if pedal response indicates air remains in the system.
5.
If "Soft Pedal" persists, proceed with 4WAL ALTERNATIVE BLEEDING PROCEDURE. See: With ABS System/4WAL Alternative Bleeding
Procedure
4WAL Alternative Bleeding Procedure
Bleed Valve Tool
EHCU Bleed Screw Location
IMPORTANT
This alternative method is not intended to replace the previous procedure. It is to be used if the Tech 1/T-100 is not available or the prior procedure is
unsuccessful.
1.
Make sure the ignition is OFF and deplete the brake booster by pumping the brake pedal several times.
