Sensor Read Test Mode
1987-891. Connect tester C-4805 or equivalent and access fault codes as outlined.
2. After Code 55 has been displayed, indicating end of fault code display, press ATM button on tool to activate display. If a specific sensor read test is desired, hold ATM button down until desired test code appears.
3. Slide Read/Hold switch to the ``Hold'' position to display the corresponding sensor output level.
4. Sensor read test display code descriptions are as follows:
a. 01--Battery temperature sensor- display number ÷ 10 equals sensor temperature.
b. 02--Oxygen sensor voltage- display number ÷ 10 equals sensor voltage.
c. 03--Throttle body temperature sensor voltage- display number ÷ 10 equals sensor voltage.
d. 04--Engine coolant temperature sensor- display number x 10 equals degrees of engine coolant sensor.
e. 05--Throttle position sensor voltage- display number ÷ 10 equals sensor voltage.
f. 07--Battery voltage- display number equals battery voltage.
g. 08--Map sensor voltage- display number ÷ 10 equals sensor voltage.
h. 09--Cruise control switches. Cruise Off- display is blank; Cruise On- display shows 00; Cruise Set- display shows 10; Cruise Resume- display shows
i. 10--Fault code erase routine (1988) display will flash 0's for 4 seconds.
5. If sensor tested corresponds to previously noted fault code, check sensor wiring. If wiring is satisfactory, replace sensor.