Code 1-1-2 & Code 1-2-2
- Code 1-1-2 is stored if a safety feature has been tripped, or an abnormal speed signal. The code is stored only if control unit has had a normal signal at some time during road test and not for stationary interruptions. Code 1-2-2 is stored when ignition is turned on. It remains until vehicle speed has been greater than 22 MPH for at least 15 seconds. If code remains after a road test at speeds greater than 22 MPH, control unit is not getting a speed signal.
- Turn ignition on. Slide cruise control selector switch to ON position. Leave control unit connector connected and measure voltage between terminals No. 10 and 11. See Figure . Voltmeter should indicate battery voltage.
- Turn ignition off. Slide cruise control selector switch to ON position. Disconnect control unit connector. Using an ohmmeter, measure resistance between control unit connector terminal No. 11 and fuse terminal No. 2 (located in fuse panel). Fuse panel is located behind ashtray on 740 and 940 and on left side of instrument panel on 960. Ohmmeter should indicate zero ohms.
- Leave control unit connector disconnected. Using an ohmmeter, measure resistance between control unit connector terminal No. 10 and steering column ground. Ohmmeter should indicate approximately zero ohms. Ensure speedometer and control unit are grounded in same location.
- Turn ignition on. Reconnect control unit connector. Raise and support vehicle so rear wheels are off the ground. Using a voltmeter, measure voltage between terminal No. 13 and ground. Slowly rotate one rear wheel. If voltmeter oscillates between 12-1.5 volts, system is operating correctly. Check circuit for possible static from other systems.
- If voltage does not oscillate, check wiring for an open or short circuit. Check wire between control unit and speedometer first. If wire is okay, check wiring between speedometer and rear axle sensor.