Sensor Read Test Mode

The sensor test mode allows the output of seven sensors and the state of three switches to be displayed on the Diagnostic Tool while the engine is not operating. This provides a means by which the entire circuit for each individual sensor and switch can be checked, including the wiring and single module engine controller (SMEC) circuitry. Test 10 allows erasure of any stored fault codes.
1. Put system into diagnostic test mode and wait for code 55 to appear on the display screen.
2. Enter system into Actuation Test Mode (ATM Test).
3. Press and hold ATM button on readout box until desired sensor access code appears, then release button.
4. Move Read/Hold switch to the Hold position. As sensor access codes are the same as some ATM test codes, the ATM test circuit will turn on before moving the Read/Hold switch to the Hold position.
5. The SMEC will now display the output of the selected sensor on the readout box. All readings displayed are to be divided by 10, except coolant sensor which is to be multiplied by 10 and battery voltage which is actual.
6. Sensor read test display code descriptions are as follows:
a. 01--Battery voltage sensor - display number divided by 10 equals sensor temperature.
b. 02--Oxygen sensor voltage - display number divided by 10 equals sensor voltage.
c. 03--Charge temperature sensor voltage - display number divided by 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 divided by 10 equals sensor voltage.
f. 07--Battery voltage - display number equals battery voltage.
g. 08--Map sensor voltage - display number divided by 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 01.
i. 10--Fault code erase routine. Display will flash 0 for four seconds.
6. If sensor tested corresponds to previously noted fault code, check sensor wiring. If wiring is satisfactory, replace sensor.