SECTION 2 -- DEFINITIONS AND ABBREVIATIONS

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

SECTION 2 -- DEFINITIONS AND ABBREVIATIONS

CHECK TRANS LIGHT

When the ECU detects a serious fault, the CHECK TRANS light (usually located on the vehicle instrument panel)

illuminates and action is automatically taken to protect operator, vehicle, and the transmission. A diagnostic code will

nearly always be registered when the CHECK TRANS light is on; however, not all diagnostic codes will turn on the

CHECK TRANS light. Codes related to the CHECK TRANS light are detailed in the code chart (refer to Section 6).

Illumination of the CHECK TRANS light indicates that a condition was detected that requires service attention.

Operation may or may not be restricted but even when restricted will allow the vehicle to reach a service assistance

location. Depending upon the cause for the CHECK TRANS light illumination, the ECU may or may not respond

to shift selector requests. The transmission may be locked in a range. That range will be shown on the shift selector

display. Both upshifts and downshifts may be restricted when the CHECK TRANS light is illuminated. Seek

service assistance as soon as possible.

Each time the engine is started, the CHECK TRANS light illuminates briefly and then goes off. This momentary

lighting shows the light circuit is working properly. If the light does not come on during engine start, request

service immediately.

22.

DIAGNOSTIC DATA READER (Figure 21)

The current Diagnostic Data Reader (DDR) is the Pro-Link 9000 diagnostic tool which is available through

Kent-Moore Heavy-Duty Division. A portable microcomputer-based receiver/transmitter/display unit, the

Pro-Link transmits and receives data to and from the ECU, processes the data, and displays appropriate

information. Use the Pro-Link during installation checkout and troubleshooting. There is a new Pro-Link

cartridge needed for use with WTEC III controls. The new Multi-Protocol Cartridge (MPC) contains a

programmed PCMCIA card which allows for reprogramming of GPI/GPO packages. Reprogramming includes

selection of a GPI/GPO package, enabling/disabling of wires and modification of certain data parameters.

Operating instructions are supplied with each Pro-Link and further information is also included in Appendix N of

this manual. Connect the Pro-Link 9000 to the diagnostic connector provided in the selector wiring harness.

Tool part numbers for the Pro-Link are as follows:

Diagnostic Kit J 38538D + J 38500313 (PROM Update) = J 38538E

Diagnostic Cartridge J 38500-302 + J 38500313 = J 38500303

MPC J 385001500C

PCMCIA (Diagnostic And Reprogramming) J 385001700B

PCMCIA (Diagnostic Only) J 385001800A

NOTE:

The new MPC is usable with WTEC II controls but the old WTEC II reprogramming cartridge will

not display the WTEC III new information. The new MPC must be used to reprogram WTEC III

systems.

V04842

Figure 21. Pro-Link 9000 Diagnostic Tool