Diagnostics

Special Tool(s)

	Transmission Fluid Pressure Gauge 307-004 (T57L-77820-A)
	Air Test Plate, Transmission 307-246 (T92P-7006-A)
	Alignment Gauge, TR Sensor 307-351 (T97L-70010-A)
	Breakout Box, EEC-V Control System 418-049 (T94L-50-EEC-V) or equivalent
	MLP-TR Cable 418-F107 (007-00111) or equivalent
	Worldwide Diagnostic System (WDS) 418-F224 New Generation STAR (NGS) Tester 418-F052 or equivalent scan tool
	Transmission Tester 307-F016 (007-00130) or equivalent
	Trans Tester TR/MLP Overlay and Manual 007-00131 or equivalent
	73 III Automotive Meter 105-R0057 or equivalent
	UV Leak Detector Kit 164-R0756 or equivalent

Diagnosing an electronically controlled automatic transmission is simplified by using the following procedures. One of the most important things to remember is that there is a definite procedure to follow. DO NOT TAKE SHORT CUTS OR ASSUME THAT CRITICAL CHECKS OR ADJUSTMENTS HAVE ALREADY BEEN MADE. Follow the procedures as written to avoid missing critical components or steps. By following the diagnostic sequence, the technician will be able to diagnose and repair the concern the first time.

On-Board Diagnostics With Diagnostic Tool

NOTE: For detailed instruction and other diagnostic methods using the scan tool, refer to the scan tool tester manual and the Powertrain Control/Emissions Diagnosis (PC/ED) manual. These quick tests should be used to diagnose the powertrain control module (PCM) and should be carried out in order.

• Quick Test 1.0 - Visual Inspection
• Quick Test 2.0 - Set Up
• Quick Test 3.0 - Key On, Engine Off (KOEO)
• Quick Test 4.0 - Continuous Memory
• Quick Test 5.0 - Key On, Engine Running (KOER)

• Special Test Mode
• Wiggle Test
• Output Test Mode
• PCM Reset Mode
• Clearing DTCs
• OBD II Drive Cycle

• Other Scan Tool Features

For further information on other diagnostic testing features using the scan tool, refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. Other diagnostic methods include the following:

• Parameter Identification (PID) Access Mode
• Freeze Frame Data Access Mode
• Oxygen Sensor Monitor Mode