(C)ABS Hold Function Check

Test Description: This test checks the hold function of the ABS system.
Symptoms: Vehicle pulls to one side, accumulator pressure exhausts during an ABS stop (red brake warning lamp comes on), wheel locks during braking, consistently rough stops.
Possible Causes: Solenoids leaking or malfunctioning, Powermaster III Unit malfunctioning.

Inspect

1. Properly connect 94-00101-A to vehicle
2. Have an assistant sit in the driver's seat (or use a pedal actuator) to operate the brakes and 94- 00101-A during the following procedures. Keep transaxle in neutral throughout test.
3. Raise vehicle and suitably support, refer to GENERAL INFORMATION (SECTION 0A).
4. Turn on ignition and allow unit to pressurize
5. Using 94-00101-A, test the hold function of the rear brakes by energizing only the rear hold solenoid. Apply the brakes moderately. Listen for the sound of fluid being forcefully sprayed in the reservoir, note pedal travel and note whether the punip runs constantly or at frequent intervals while the solenoid is energized.
6. During the "Rear Hold Functional Check" try to turn a rear wheel. The wheel should turn freely for 6 or more seconds before the brakes begin to apply. In addition, you should not hear the sound of fluid being forcefully sprayed in the reservoir, the brake pedal should not steadily sink to the floor and the pump should not run constantly or frequently. If the rear brakes apply in 5 seconds or less, or any of the other conditions previously listed exists, replace the rear solenoid assembly in the Powermaster III and perform steps 5 and 6 again.
7. If the brakes continue to apply in 5 seconds or less or any of the other conditions mentioned in step 6 still exists, replace the Powermaster III Unit.
8. Moderately apply the brakes. Using the 94- 00101-A, test the hold function of one of the front wheel brakes by using the front hold function in the ABS hydraulic function check menu of 94-
00101-A. Listen for the sound of fluid being forcefully sprayed in the reservoir, note pedal travel and note whether the pump runs constantly or at frequent intervals while the solenoid is energized. Test the hold function of the other front hold solenoid in the same way.

Important

The 94-00008 does not have a front hold function. To accurately test the hold function of the front hold solenoids, obtains 94-00008-A, if possible. if not, perform test
(B) "ABS System Functional Check". If this test passes, continue with the following: use the Manual Relay and Solenoid Control test. Turn on the relays, depress the brake pedal with moderate force. Turn on the left front hold solenoid, listen for brake fluid being forcefully sprayed within the reservoir. There should be no sound. Turn on the left front release solenoid, you should hear brake fluid being forcefully sprayed within the reservoir, and some brake pedal drop may be noticed. If there was sound during testing of the hold solenoid, but no sound during testing of the release solenoid, check for crossed wiring to the solenoid. If sound is heard during hold, or no sound is heard during release, and the wiring is correct, replace the solenoid and retest. Repeat for the fight front hold and right front release solenoids.

9. Try to turn the appropriate front wheel. The wheel should turn with only driveline and differential resistance for 6 or more seconds before the brake begins to apply. In addition, you should not hear the sound of fluid being forcefully sprayed in the reservoir, the brake pedal should not steadily sink to the floor and pump should not run constantly or frequently. If the rear brakes apply in 5 seconds or less, or any of the other conditions previously listed exists, replace the appropriate solenoid assembly in the Powermaster III and perform steps 8 and 9 again.
10. If the brake continues to apply in 5 seconds or less, or any of the conditions listed in step 9 still occurs, replace the Powermaster III Unit.