Pinpoint Test B - System Operation Intermittent
- Verify condition. Determine whether intermittent condition occurs while cruising, operating cruise control switches or turning steering wheel. If condition occurs while cruising, go to next step. If condition occurs while operating control switches or turning steering wheel, go to step 4).
- With engine running, check vacuum at servo. Normal servo operation requires a minimum of 2.5 in. Hg vacuum. Repair malfunction in vacuum supply if necessary.
- Perform appropriate SERVO test under DIAGNOSIS & TESTING. Lightly tap servo body while performing test. If servo is okay, substitute a known good amplifier. If cruise control system operates properly, replace amplifier.
- Perform CONTROL SWITCHES test under DIAGNOSIS & TESTING. If control switches are okay, substitute a known good amplifier. If cruise control system operates okay, replace amplifier. If control switches fail test, replace as necessary. Clean or replace brushes and steering wheel ring.