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3 0 1 8
1977 PONTIAC SERVICE MANUAL
C. Perform regulator test.
1. Allow engine to continue to run at idle speed. Pressure should level off between 115-130 P.S.I. when
checked on regulated side of regulator. Refer to Figure 3.
I
Pressure levels off
(
I
Pressure does not
I
in specified range
Proceed to Step
6
level off in specified
Replace regulator
I
range
STEP 6
-
Check system operation independent of compressor as follows:
A. Connect test gauge (J-22124) to high pressure line that attaches to compressor regulator. Figure 4.
B. Record rear trim height of unloaded vehicle at curb weight. (Basic car with full tank of gas).
C. Add approximately 250-3OO# to passenger car trunk. (Two people or equivalent weight.
3
people for station
wagon.)
EXTERNAL AIR
SUPPLY
7/
-
FIGURE 4-CHECKING SYSTEM OPERATION WITHOUT COMPRESSOR
0.
With external compressed air supply, charge system to a maximum of 125 psi (if available) thru the gage
fill valve. I f vehicle returns to unloaded trim height,
f'h"
measured in Step B, also observe if pressure holds
steady.
I
Vehicle raises to original
or unloaded trim height.
Pressure holds steady.
Vehicle raises but
Vehicle does not raise.
pressure drops off and
car starts to lower
immediately
System okay, reconnect high
Proceed to Step
7
pressure line to compressor
and charge compressor to
maximum available pressure
thru fill valve on regulator
Proceed t o step 12
FIG. 3 0 - 2 5 AUTOMATIC LEVEL CONTROL DIAGNOSIS
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