Code 77, Cruise Control Power Relay Circuit

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 voltmeter mode.
Probe terminal No. 2 (Dark Blue/White wire) at cruise control relay connector. If voltage is less than 10 volts, repair open Dark Blue/White wire. Perform VERIFICATION TEST SP-VER ., If voltage is 10 volts or more, go to next step.
Using an external ohmmeter, check resistance between terminals H1 and H2 at cruise control relay. See Figure . If resistance is 100 ohms or more, 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.
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.
If resistance is 10 ohms or more, 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.
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 10 ohms or more, replace SBEC. Perform VERIFICATION TEST SP-VER .