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Test SP-16A Code 77, Cruise Control Power Relay Circuit

  1. Turn ignition switch to OFF position. Disconnect cruise control relay. Inspect connector. If connector condition is not okay, repair connector as necessary. Perform VERIFICATION TEST SP-VER  . If connector condition is okay, turn ignition switch to ON position. Place DRB-II in volt-meter mode.
  2. Probe terminal No. 2 (Dark Blue/White wire) at cruise control relay connector. If voltage is less than 10 volts, repair open in Dark Blue/White wire. Perform VERIFICATION TEST SP-VER  . If voltage is more than 10 volts, go to next step.
  3. Using an external ohmmeter, check resistance between terminals H1 and H2 at cruise control relay. See Fig 1 . If resistance is more than 100 ohms, replace cruise control relay. Perform VERIFICATION TEST SP-VER  . If resistance is less than 100 ohms, turn ignition switch to OFF position. Disconnect Single Board Engine Controller (SBEC) connector.
    Fig 1: Testing Cruise Control Power Relay
    G92C04810
  4. Inspect connector. If connector condition is not okay, repair connector as necessary. Perform VERIFICATION TEST SP-VER  . If connector condition is okay, using an external ohmmeter, check resistance between terminal No. 55 (Black/Light Blue wire) and terminal No. 1 (Violet/White wire) at cruise control relay connector.
  5. If resistance is more than 10 ohms, repair open Violet/White or Black/Light Blue wire. Perform VERIFICATION TEST SP-VER  . If resistance is less than 10 ohms, place DRB-II in ohmmeter mode. Probe terminal No. 55 (Black/Light Blue wire) at SBEC connector.
  6. If resistance is less than 10 ohms, repair short to ground in Violet/White or Black/Light Blue wire. Perform VERIFICATION TEST SP-VER  . If resistance is more than 10 ohms, replace SBEC. Perform VERIFICATION TEST SP-VER  .