Brake Release Valve Test — GMC Jimmy Typhoon (1992-1993)

Brake Release Valve Test GMC Jimmy Typhoon

Disconnect vacuum release hose (large hose) from servo. Connect vacuum pump to end of hose. Apply 10-20 in. Hg to hose. If vacuum does not hold, or if it leaks down slowly, check for leaking or misadjusted brake release valve. See BRAKE & CLUTCH RELEASE SWITCH/VALVE ADJUSTMENT under ADJUSTMENTS. If brake release valve is okay, check for leaking hose between servo and brake release valve. If hose is okay, replace servo.

Connector Terminals of Cruise Control System Components Id 1991-92 Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup. Scheme 4

Scheme 4: Connector Terminals of Cruise Control System Components Id 1991-92 Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup

Cruise Ctrl Diagnosis (Except Lumina APV, Silhouette & Trans Sport). Scheme 5

Scheme 5: Cruise Ctrl Diagnosis (Except Lumina APV, Silhouette & Trans Sport)

Servo Tests, 1 of 2, (Except Lumina APV, Silhouette & Trans Sport). Scheme 6

Scheme 6: Servo Tests, 1 of 2, (Except Lumina APV, Silhouette & Trans Sport)

Servo Tests, 2 of 2, (Except Lumina APV, Silhouette & Trans Sport). Scheme 7

Scheme 7: Servo Tests, 2 of 2, (Except Lumina APV, Silhouette & Trans Sport)

Cruise Off/On/Resume/Accel Switch Test (Part 1) Except Lumina APV, Silhouette & Trans Sport. Scheme 8

Scheme 8: Cruise Off/On/Resume/Accel Switch Test (Part 1) Except Lumina APV, Silhouette & Trans Sport

Cruise Off/On/Resume/Accel Switch Test (Part 2) Except Lumina APV, Silhouette & Trans Sport. Scheme 9

Scheme 9: Cruise Off/On/Resume/Accel Switch Test (Part 2) Except Lumina APV, Silhouette & Trans Sport

Cruise Release Switch Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup). Scheme 10

Scheme 10: Cruise Release Switch Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup)

Cruise Set/Coast Button Switch Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup). Scheme 11

Scheme 11: Cruise Set/Coast Button Switch Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup)

Speed Sensor Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup). Scheme 12

Scheme 12: Speed Sensor Test (Astro, Safari, Sonoma, Syclone, Typhoon & "S" & "T" Series Blazer, Jimmy & Pickup)

Cruise Release Switch Test - Auto. Trans. (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup). Scheme 13

Scheme 13: Cruise Release Switch Test - Auto. Trans. (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup)

Cruise Release Switches Test - Man. Trans. (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup). Scheme 14

Scheme 14: Cruise Release Switches Test - Man. Trans. (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup)

Cruise Set/Coast Button Switch Test (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup). Scheme 15

Scheme 15: Cruise Set/Coast Button Switch Test (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup)

Speed Sens Test (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup). Scheme 16

Scheme 16: Speed Sens Test (Suburban, Van & "R" & "V" Series Blazer, Jimmy & Pickup)

Cruise Control Will Not Engage - 1 Of 2 (Lumina APV, Silhouette & Trans Sport). Scheme 17

Scheme 17: Cruise Control Will Not Engage - 1 Of 2 (Lumina APV, Silhouette & Trans Sport)

Cruise Control Will Not Engage - 2 Of 2 (Lumina APV, Silhouette & Trans Sport). Scheme 18

Scheme 18: Cruise Control Will Not Engage - 2 Of 2 (Lumina APV, Silhouette & Trans Sport)

Cruise Control Will Not Maintain Set Speed, or Surges Lumina APV, Silhouette & Trans Sport. Scheme 19

Scheme 19: Cruise Control Will Not Maintain Set Speed, or Surges Lumina APV, Silhouette & Trans Sport

Cruise Control Will Not Resume, Accelerate or Tap Up Lumina APV, Silhouette & Trans Sport. Scheme 20

Scheme 20: Cruise Control Will Not Resume, Accelerate or Tap Up Lumina APV, Silhouette & Trans Sport