Cruise Control - Tap Up or Tap Down Response
89chevy03GMC NUMBER: 88-T-201
GROUP: 9 - Accessories
DATE: February, 1989
CORPORATE
NUMBER: 869004
SUBJECT: CRUISE CONTROL - "TAP UP OR TAP DOWN RESPONSE"
MODELS: 1988 R/V 1, 2 SUBURBAN/JIMMY WITH 5.7L (L05) OR 7.4L (L19) ENGINES AND CRUISE CONTROL (K34)
Some 1988 R/V Suburban/Jimmys within the VIN breakpoints listed below, equipped with 5.7L or 7.4L gasoline engines and cruise control may exhibit a condition involving cruise control response. Acceleration several mph more than expected may occur when the driver uses the Tap-up or Tap-down cruise modes. This may be caused by voltage transients induced during engine start. A cruise control module which is less susceptible to negative voltage transients has been released.
Vehicles Involved
1988 GMC Suburban/Jimmys equipped with 5.7L or 7.4L engines and cruise control (K34) built within the following VIN breakpoints:
From Through
GMC JF510956 JF534128
FIGURE 1:
Service Procedure
Cruise control module replace. Refer to Figure No.1.
1. Disconnect cruise harness (121).
2. Disconnect module assembly (116) by prying back the retaining dip on the bracket and sliding the module out.
3. Install new module P/N 25110868.
4. Connect cruise harness.
Parts Information
Part Part Number Quantity
Cruise control module 25110868 1
Parts are currently available from GMSPO.
The labor operation to replace the cruise control module is:
Labor Op: R1220
Labor Time: .3 Hr
FIGURE 1:
115. Bracket Assembly
116. Module
117. Nut (3-4 N-m)
121. Cruise Control Harness Connector
122. Parking Brake Assembly