Using J 42958 Cruise Control Tester
DIAGNOSTIC AIDSIn order to avoid misdiagnosis:
^ Inspect the brake lamps for proper operation.
^ Visually inspect all fuses related to the cruise control system.
^ Inspect all connectors for poor terminal retention, corrosion or damage.
^ Inspect the throttle linkage/cable for mechanical binding.
^ Inspect the cruise control cable adjustment.
^ EMI on the speed sensor signal circuit may cause erratic operation.
PCM INHIBIT
The PCM will inhibit cruise control if one or more of the following has occurred:
^ When park, reverse, neutral, or first gear is indicated.
^ When certain Diagnostic Trouble Codes (DTC) are stored.
^ When an over/undercharged battery condition exists
^ With low engine RPM
^ With high engine RPM (fuel cut-off)
THE CRUISE CONTROL TESTER
When this tester is used on some vehicles with high resistance or an open in the cruise control module ground circuit, the tester's LEDs will light abnormally. For example, the Brake/Clutch and VSS LEDs will light normally but the Ignition LED will be dim with the ON/OFF switch in the OFF position. However, with the ON/OFF switch in the ON position only the VSS LED will light. If you come upon the above situation, please check the ground circuit prior to going on with your diagnosis.
TEST
Steps 1-10:
Steps 11-23:
Steps 24-39:
