Solenoid Test (On/Off)

Only use this test when no DTCs are stored and you suspect a leaky solenoid or check valve.
1) Turn ignition switch to "LOCK".
2) Install TECH-1 with ABS/Air Bag Cartridge.
3) Turn ignition switch to "ON".
4) Pump brake pedal and deplete vacuum from power booster.
5) Select manual control (F0).
6) Select left front or right front motor release.
7) Release the motor for the channel being tested. Review the motor command and feedback currents to be sure the motor released properly. Refer to "Motor Test (Apply/Release)".
8) Select the solenoid for the same channel as that being tested.
9) With no brake pedal pressure applied, turn the solenoid on. 10 Depress the brake pedal. It should be very high and firm.

NOTE: If the pedal goes nearly to the floor, the solenoid is leaking or not closing and/or the check valve is leaking, proceed to Step 12.

11) With brake pressure still applied, turn the solenoid off. The brake pedal should move toward the floor. This verifies normal solenoid operation. END OF TEST.

NOTE: If the pedal does not, the solenoid is stuck on, proceed to Step 12.

12) Verify that the solenoid connectors are connected to the proper solenoids, (the right front solenoid is the one on the rear of the modulator, closest to the brake booster). If the wiring is incorrect, move the connectors to the proper solenoid and repeat this entire test starting with Step 1.

A. Physically switch the two solenoids.
B. Repeat the entire test starting at Step 1 for the channel in question.

^ If the test now works properly, test the other channel. If the test fails for this channel, replace the solenoid currently installed in this channel. Refer to "ABS Solenoid".
^ If the test fails for the same channel, the check valve is leaking. Replace hydraulic modulator. Refer to "Hydraulic Modulator".

WARNING: After performing Step 12 it is necessary to bleed the brake system.