Checking Input & Output Signals At ECM Using Scan Tool (2.4L): Notes

Various inputs and outputs can be veiwed using the data display function on the manufacturer's scan tool. Select the function, and check the input and output signals of the engine control unit. If there is an abnormal condition, inspect and repair as necessary.

Data Display Item No.	(1)(2) System Description
11	O2 Sensor Voltage
12	Mass Air flow Sensor
13	Intake Air Temperature
14	Throttle Position Sensor
15	Open or short in motor position sensor circuit.
16	Power Supply & Ignition Switch (-Ig Circuit)
18	Ignition Switch (M/T Only)
18	Ignition Switch (A/T Only)
21	Coolant Temperature Sensor
22	Crank Angle Sensor Signal
25	Barometric Pressure Sensor
26	Idle Position Switch
28	A/C Switch
29	Inhibitor Switch (A/T Only)
41	Fuel Injectors
43	EGR Temperature Sensor (California Only)
44	Ignition Coil/Spark Advance
49	A/C Power Relay
(1) To aid in diagnosis, some data display items are shown within diagnostic testing procedurers. (2) Not all systems are provided with a data display option on scan tool. In these cases use of a multi-meter or oscilloscope may be required.