Diagnosis Chart A - Pontiac TRANS AM 1977 Service Manual

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CHECK TRANS. OIL LEVEL
-T-
NO UPSHIFT OR
I
UPSHIFTS STILL DELAYED
I
CHECK LlNE PRESSURE I N DRIVE-BRAKES
APPLIED. ENGINE AT 1000 RPM.
I
I
DISCONNECT ELECT. PLUG
NORMAL UPSHIFT OCCURS
FROM TRANS. AND TEST CAR
1
I-
- -
THE
D E T E N T
S O L E N O I D
IS
BEING
ELECTRICALLY ENERGIZED WHEN I T SHOULD
NOT BE. CHECK FOR SHORTED CIRCUIT I N THE
DETENT WIRING SYSTEM AND/OR THE DETENT
55-70 PSI
9
I
SWITCH.
THE
PROBLEM
IS
NOT
IN
THE
60-90 PSI
I
1
INOPERATIVE DETENT SOLENOID]
I
SEE "CONTROL VALVE ASSEMBLY-
GOVERNOR LlNE PRESSURE CHECK"
CHECK "LINE TO DETENT" ORIFICE
I N SPACER PLATES FOR OBSTRUCTION
(SEE FIG. 5)
I
90-1 50 PSI
I
CHECK LINE PRESSURE IN NEUTRAL-
BRAKES APPLIED, ENGINE AT 1000 RPM
I
CHECK
FOR
VACUUM
LEAKS OR NO VACUUM
IMPROPER VACUUM AT
MODULATOR")
1
VALVES IN DETENT VALVE TRAIN
I
CHECK MODULATOR VALVE
LEAKING DIAPHRAGM
FOR FREENESS
OR BENT NECK (SEE
"INSPECTION
OF
CHECK CASE FOR DAMAGE
VALVE")
OR POROSITY AT MOD. VALVE
7

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Firebird 1977

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