Before Pinpoint Tests

DESCRIPTION
The following items must be checked prior to beginning the diagnostic procedures.

KNOW/UNDERSTAND THE CONCERN
In order to properly diagnose a concern you must first understand the customer complaint or condition. Customer contact may be required in order for the technician to begin to verify the concern. You must understand the conditions as to when the concern occurs. For example:
- hot or cold vehicle temperature.
- hot or cold ambient temperature.
- vehicle driving conditions. After understanding when and how the concern occurs, proceed to verifying the concern.

VERIFICATION OF CONDITION
This section provides information which must be used in both determining the actual cause of customer concerns and performing the appropriate service procedures.

NOTE: Some transmission conditions may cause engine concerns. An EPC short circuit may cause alternate firing. The torque converter clutch not disengaging will stall the engine. The following procedures must be used when verifying customer concerns for transmission:

Required Equipment
- Rotunda Transmission Tester 007-00085
- Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent.
- Rotunda CD4E Transmission Tester Update 007-00125.
- Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent.
- Rotunda Transmission Range (TR) Sensor Cable (MLPS Cable) 007-00129, used with Transmission Tester 007-00035.
- RotundA104-Pin Breakout Box 014-00950 or equivalent.
- Transmission Range (TR) Sensor Alignment Tool (MLPS Alignment Tool) T94P-70010-AH.
Determine Customer Concern
- Hot or cold vehicle operating temperature
- Hot or cold ambient temperatures
- Type of terrain
- Vehicle loaded/unloaded
- City/highway driving
- Upshift
- Downshift
- Coasting
- Engagement
- Noise/vibration
Check Fluid Level and Condition Testing and Inspection

NOTE:
- If noise/vibration, check for dependencies either RPM dependent, vehicle speed dependent, shift dependent, gear dependent, range dependent or temperature dependent.
- Some CD4E transaxle conditions may cause engine concerns. The torque converter clutch not disengaging will stall the engine.