Engine Running Test Mode

1987-89
This system monitors sensors on vehicle which check operating conditions while engine is running. Using number displayed on tester C-4805 or equivalent, follow instructions given in code description for values of each test. The engine running test mode can be performed with engine idling in neutral with parking brake applied or while driving down the road. With diagnostic tester read/hold switch in read position, engine running test mode is initiated after engine is started.

To select test code, place read/hold switch in the read position and depress actuator button until desired code appears. Release actuator button and switch read/hold switch to hold position. The logic module or SMEC will monitor that system test and results will be displayed. Using the code description, the display number must be adjusted as required.

Engine running test display code descriptions are as follows:

a. 61 - Battery temperature sensor - display number ÷ 10 equals volts.
b. 62 - Oxygen sensor - display number ÷ 10 equals volts.
c. 63 - Intake charge temperature sensor - display number ÷ 10 equals volts.
d. 64 - Engine coolant temperature sensor - display number x 10 equals °F.
e. 65 - Throttle position sensor - display number ÷ 10 equals volts.
f. 66 - Spark retard due to spark - display is cylinder number (upper digit)/degrees (lower digit).
g. 67 - Battery voltage sensor - display equals volts.
h. 68 - Manifold vacuum/pressure sensor - display is in. Hg.
i. 69 - Minimum throttle position sensor - display number ÷ 10 equals volts.
j. 70 - Minimum airflow idle speed sensor-display number x 10 equals rpm.
k. 71 - Vehicle speed sensor - display is mph.
l. 72 - Engine speed sensor - display number ÷ 10 equals rpm.