Test Procedure

-- PERFORM: preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

-- CONNECT: Scan Tool

-- START: Engine

-- CHECK: Engine rpm:

Diagnostic text	Specified value
Engine rotations per minute (rpm)	Cranking or idle speed

-- IGNITION: OFF

If the specified value was obtained:

-- PERFORM: Visual Inspection of wiring and component

-- CHECK: wiring for an open, high resistance or short

-- CHECK: wiring connection for damage, corrosion, loose or broken terminals

-- REPAIR: faulty wiring or connection

If any of the specified value was not obtained:

-- DISCONNECT: Engine Speed Sensor -G28- electrical harness connector.

-- IGNITION: ON

-- CHECK: Engine Speed Sensor -G28- electrical harness connector terminals 1 to 3 for voltage.

Specified Value: About 5.0 V

-- IGNITION: OFF

Continue test according to the following table:

Value	Cause	Test
If the specified value was not obtained:	Open or shorted circuit	GO TO: If the Specified Value Was Not Obtained
If the specified value was obtained:	Check reference signal circuit	GO TO: If the Specified Value Was Obtained