8–2 Copyright © 1998 General Motors Corp.
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Table 8–1. Troubleshooting Performance Complaints
Problem Probable Cause Suggested Remedy
SHIFT SELECTOR DISPLAYS
“CATEYES”
AND VEHICLE IS
NOT OPERABLE
Primary shift selector is remote
and terminal 2 to 3 jumper wire
in RSI connector is in place
Remove, cut, and seal ends of
jumper wire. If removed, install
cavity plugs in the terminal
cavities.
No communication between the
ECU and a remote shift selector
Refer to Code 23 XX in
Troubleshooting Procedure
SHIFT SELECTOR
DISPLAY IS BLANK
VIM fuse is blown Replace VIM fuse
Poor battery power or ground
connection
Clean and/or repair battery
connections
Blown fuse or fusible link at
battery
Replace battery fuse or
fusible link
VEHICLE WILL NOT START
(ENGINE WILL NOT CRANK)
Lever shift selector not in neutral Select
N
(Neutral) and restart
Dead battery Recharge battery
Disconnected battery Reconnect battery
No display Faulty ignition circuit (wire 146) Repair wire 146
Faulty starter circuit Repair vehicle starter circuit
Faulty neutral start relay Replace neutral start relay
Faulty wiring in neutral start
circuit
Repair wiring
Voltage to ECU too low Check battery and charging
system voltage
Faulty lever shift selector Replace lever shift selector
Lack of battery voltage on
Circuit 123 from ECU when in
neutral
Repair Circuit 123 or replace
ECU
All display segments on both
sides of display lighted
No calibration installed in ECU
Voltage to ECU too low
Load Calibration
Check battery and charging
system voltage
All display segments on right
side of display lighted, left side
of display blank
Calibration corrupted by
repeatedly turning off ECU
power before turning off ignition
(check for codes)
Replace ECU and rewire
switching so that the ECU has
power before ignition is on and
after ignition is off
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