Copyright © 1998 General Motors Corp. 6–3
DIAGNOSTIC CODES
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
D. Exiting the Diagnostic Display Mode.
Exit the diagnostic display mode using one of the following
procedures:
1. On a pushbutton shift selector, press the
⇑ (
Up
)
and
⇓ (
Down
)
arrow buttons at the same time or
press any range button,
D
,
N
, or
R
. The shift (
D
,
N
, or
R
) is commanded if not inhibited by an
active code.
2. On a lever shift selector, momentarily press the
DISPLAY
MODE
button or move the shift lever
to any shift position other than the one it was in when the diagnostic display mode was activated. If
the shift is inhibited, the ECU will continue to command the current range and sound the tone
continuously until the lever is returned to its original position.
3. Wait until timeout (approximately 10 minutes) and the system will automatically return to the
normal operating mode.
4. Turn off power to the ECU (turn off the vehicle engine at the ignition switch).
6–3. DIAGNOSTIC CODE RESPONSE
The following ECU responses to a fault provide for safe transmission operation:
•
D
o
N
ot
S
hift (DNS) Response
—
Release lockup clutch and inhibit lockup operation.
—
Inhibit all shifts.
—
Turn on
Do Not Shift
light.
—
Pulse the tone generator for 8 seconds when the fault is first detected.
—
Blank the select digit in the display.
—
Ignore any range selection inputs and disable the button feedback tone for the pushbutton shift
selector. On the lever shift selector sound the tone continuously if the shift lever is moved to a
position other than the one selected when the fault was first detected.
•
D
o
N
ot
A
dapt (DNA) Response
—
The ECU stops adaptive shift control while the code is active. Do not adapt shifts when a code with
the DNA response is active.
•
Sol
enoid
Off
(SOL OFF) Response
—
All solenoids are commanded off (turning solenoids “A” and “B” off electrically causes them to be
on hydraulically).
•
R
eturn to
P
revious
R
ange (RPR) Response
—
When the speed sensor ratio or C3 pressure switch tests associated with a shift are not successful,
the ECU commands the same range as commanded before the shift.
•
N
eutral
N
o
C
lutches (NNC) Response
—
When certain speed sensor ratio or C3 pressure switch tests are not successful, the ECU commands
a neutral condition with no clutches applied.
6–4. SHIFT SELECTOR DISPLAYS RELATED TO ACTIVE CODES
•
“Cateyes” — The forward slash segments and the middle horizontal segments (-\-; -\-) will be on for
each display digit under the following conditions:
—
RSI link fault is active (Code 23 12 or 23 14)
—
When two COP timeouts occur within two seconds of each other (reference Code 69 33) for a
remote selector display
—
An SPI communications fault is active (Code 69 32)
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