DIAGNOSTIC CODE TROUBLESHOOTING

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

DIAGNOSTIC CODES

56.

DIAGNOSTIC CODE TROUBLESHOOTING

Beginning The Troubleshooting Process

1. Begin troubleshooting by checking the transmission fluid level and ECU input voltage. Check

diagnostic codes by:

Using the shift selector display.

Using the Pro-Link 9000 diagnostic tool.

2. When a problem exists but a diagnostic code is not indicated, refer to the Performance Complaint

Section for a listing of various electrical and hydraulic problems, their causes, and remedies.

3. If a diagnostic code is found in the ECU memory, record all available code information and clear

the active indicator (refer to Paragraph 52).

4. Test drive the vehicle to confirm a diagnostic code or performance complaint.

If the code reappears, refer to the Diagnostic Code section (Section 6) and the appropriate code

chart. The Diagnostic Code section lists diagnostic codes and their description. Locate the

appropriate troubleshooting chart and follow the instructions.

If the code does not reappear, it may be an intermittent problem. Use the Pro-Link and the

code display procedure described in Section 5. The code display procedure will indicate the

number of times the diagnostic code has occurred. Refer to the troubleshooting chart for

possible cause(s) of the problem.

Appendix A deals with the identification of potential circuit problems. Refer to Appendix A if a

circuit problem is suspected.

NOTE:

Information concerning specific items is contained in the appendices located in the back of this

manual. The appendices are referred to throughout the manual.

Solenoid Locations

Solenoid locations in the control module are as illustrated in Figure 51. Refer to Figure 51 as

necessary when using the diagnostic code schematics.

Diagnostic Code Schematics

The diagnostic code schematics in this section show wiring for both the optional oil level sensor and

retarder, where applicable. If your transmission is not equipped with an oil level sensor or retarder,

disregard the portions of the schematic pertaining to those optional pieces of equipment. Refer to the

appropriate transmission Service Manual for solenoid replacement procedures.

Wire/Terminal Numbering Scheme

WTEC III wire identification presents the wire number followed by the ECU terminal source

(i.e., 157-S30). This is done to retain the wire number/function assignments from WTEC II and

indicate the ECU connector and terminal origination for WTEC III. If there is a letter suffix following

the wire number, there is a splice between the ECU source and wire destination (i.e., 136A-S16).