Sensor Read Test Mode

1986-89
1. Place system in diagnostic test mode and wait for code 55 to appear on display screen.
2. Press ATM button on tool to activate display. A specific sensor read test can be called by holding ATM button down until desired test code appears.
3. Slide read/hold switch to Hold position to display corresponding sensor output level.

Sensor Read Test Display Codes

Code Description
01 Battery temperature sensor-display number ÷ 10 equals sensor temperature.
02 Oxygen sensor voltage-display number ÷ 10 equals sensor voltage.
03 Charge temperature sensor voltage-display number ÷ 10 equals sensor voltage.
04 Engine coolant temperature sensor-display number x 10 equals degrees of engine coolant sensor.
05 Throttle position sensor-display number ÷ 10 equals sensor voltage.
06 Peak knock sensor voltage-display number is sensor voltage.
07 Battery voltage-display number is voltage.
08 MAP sensor voltage-display number ÷ 10 is voltage.
09 Control switches (1987-89)-cruise Off, display is blank; cruise On, display shows 00; cruise set, display shows 10; cruise Resume, display shows 01.
10 Fault codes erase routine (1988)-display will flash 0's for 4 seconds.