Allison Transmission WTEC II Electronic Controls Troubleshooting Manual – PDF DOWNLOAD
DESCRIPTION:
Allison Transmission WTEC II Electronic Controls Troubleshooting Manual – PDF DOWNLOAD
GENERAL DESCRIPTION :
TRANSMISSION
The World Transmission Electronic Controls WTEC II system features closed-loop clutch control to provide
superior shift quality over a wide range of operating conditions. MD 3000 (except 3070), HD 4000, and B Series
configurations can be programmed to have up to six forward ranges, neutral, and one reverse range. The MD 3070
has seven forward ranges and one reverse range. Figures 1–1 and 1–2 show electronic control unit components.
WTEC II Electronic Controls consist of the following components:
• Basic or Max Feature Electronic Control Unit (ECU)
• Pushbutton or Lever Shift Selectors (remote or integral to the ECU)
• Optional Secondary Shift Selector
• Engine, Turbine and Output Speed Sensors
• Throttle Position Sensor (TPS) (or electronic engine throttle signal or PWM signal)
• Control Module (Electro-Hydraulic Valve Body)
• Wiring Harnesses
• Vehicle Interface Module (VIM)
• Optional Retarder Controls
• TransID Feature
TABLE OF CONTENTS:
Allison Transmission WTEC II Electronic Controls Troubleshooting Manual – PDF DOWNLOAD
Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i
SAFETY INFORMATION
Important Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Warnings, Cautions, and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Trademarks Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Shift Selector Terms and Display Indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
SECTION 1. GENERAL DESCRIPTION
1–1. TRANSMISSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1–2. ELECTRONIC CONTROL UNIT (ECU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1–3. SHIFT SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
A. Pushbutton Shift Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
B. Lever Shift Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1–4. THROTTLE POSITION SENSOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1–5. SPEED SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
1–6. CONTROL MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1–7. WIRING HARNESSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
A. External Wiring Harness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
B. Internal Wiring Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8
1–8. VEHICLE INTERFACE MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10
1-9. TRANSID FEATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
SECTION 2. DEFINITIONS AND ABBREVIATIONS
2–1. DO NOT SHIFT LIGHT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2–2. DIAGNOSTIC DATA READER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2–3. ABBREVIATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
SECTION 3. BASIC KNOWLEDGE
3–1. BASIC KNOWLEDGE REQUIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3–2. USING THE TROUBLESHOOTING MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3–3. SYSTEM OVERVIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3–4. IMPORTANT INFORMATION IN THE TROUBLESHOOTING PROCESS . . . . . . . . . . . . . . . 3–2
3–5. BEGINNING THE TROUBLESHOOTING PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
SECTION 4. WIRE CHECK PROCEDURES
4–1. CHECKING OPENS, SHORTS BETWEEN WIRES,
AND SHORTS-TO-GROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4–2. CHECKING AT TRANSMISSION CONNECTOR AND THE INTERNAL HARNESS
FOR OPENS, SHORTS BETWEEN WIRES, AND SHORTS-TO-GROUND. . . . . . . . . . . . . . . 4–2
T A B L E O F C O N T E N T S
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
vi Copyright © 1998 General Motors Corp.
SECTION 5. OIL LEVEL SENSOR Page
5–1. ELECTRONIC FLUID LEVEL CHECK (SHIFT SELECTOR) . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
A. Fluid Level Check Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5–2. ELECTRONIC FLUID LEVEL CHECK (PRO-LINK® 9000) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
A. Fluid Level Check Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
SECTION 6. DIAGNOSTIC CODES
6–1. DIAGNOSTIC CODE MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6–2. CODE READING AND CODE CLEARING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6–3. DIAGNOSTIC CODE RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
6–4. SHIFT SELECTOR DISPLAYS RELATED TO ACTIVE CODES . . . . . . . . . . . . . . . . . . . . . . . 6–3
6–5. DIAGNOSTIC CODE LIST AND DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
6–6. DIAGNOSTIC CODE TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–17
A. Beginning the Troubleshooting Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–17
B. Solenoid Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–17
C. Diagnostic Code Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–18
D. Diagnostic Code 13 and 35 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–18
SECTION 7. INPUT AND OUTPUT FUNCTIONS
7–1. INPUT FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
7–2. OUTPUT FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3
SECTION 8. GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
8–1. GENERAL NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
8–2. TROUBLESHOOTING PERFORMANCE COMPLAINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2
APPENDICES
A. IDENTIFICATION OF POTENTIAL CIRCUIT PROBLEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
B. CHECKING CLUTCH PRESSURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
C. SOLENOID AND CLUTCH CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1
D. WIRE/CONNECTOR CHART. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1
E. CONNECTOR PART NUMBERS, TERMINAL PART NUMBERS,
TOOL PART NUMBERS, AND REPAIR INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–1
F. THROTTLE POSITION SENSOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F–1
G. MISCELLANEOUS ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G–1
H. HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H–1
J. WT WIRING SCHEMATICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J–1
K. SOLENOID AND TEMPERATURE CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K–1
L. EXTERNALLY-GENERATED ELECTRONIC INTERFERENCE . . . . . . . . . . . . . . . . . . . . . . . L–1
M. DIAGNOSTIC TREE — WT SERIES HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . M–1
N. PRO-LINK® 9000 DIAGNOSTIC DATA READER INFORMATION . . . . . . . . . . . . . . . . . . . . . N–1
P. INPUT/OUTPUT FUNCTION WIRING SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P–1
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