Not Using J 42958 Cruise Control Tester
DIAGNOSTIC AIDSIMPORTANT: Perform the following in order to avoid misdiagnosis:
^ Inspect for proper adjustment of the brake switches.
^ Inspect for proper operation of brake lamps.
^ Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
^ Inspect cruise control cable adjustment, should have minimum slack.
^ Inspect for stored Diagnostic Trouble Codes (DTCs) in the PCM. Refer to A Diagnostic System Check - Computers and Control Systems. Initial Inspection and Diagnostic Overview
^ EMI on the speed sensor signal circuit may cause erratic cruise control operation.
Conditions for Enabling Cruise Control
^ When vehicle speed is more than 40 km/h (25 mph).
^ When PARK, REVERSE, NEUTRAL, or 1st gear is not indicated.
^ When an over/undercharged battery condition does not exist.
^ With normal engine RPM.
^ Without high engine RPM (fuel cut-off).
TEST
Steps 1-7:
Steps 8-22:
Steps 23-34:
Steps 35-43:
