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3 ~ - 2 2 '
1 9 7 7 PONTIAC SERVICE M A N U A L
STEP 13
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Check operation of height control valve as follows:
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A. Reconnect tubing from height control valve to shocks
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6. Disconnect link from height control valve over-travel arm, refer to figure
9
for typical link.
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C. Connect test gauge J-22124 to height control valve intake port. Figure 10.
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FIGURE 10-CHECKING OPERATION OF HEIGHT CONTROL VALVE
D. Attach 80-1 10 psi air source to gauge fill valve; move height control valve over-travel arm upward (intake
position) and hold in this position for approximately 30 seconds.
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Vehicle raises
Vehicle does not raise
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To check if vehicle lowers properly,
Replace height control valve and
move height control valve over-travel
repeat step 13. Adjust height
arm downward (exhaust position)
control valve as required per in-
and hold in this position. Air should
structions in shop manual. End of
Reconnect link t o height control
valve over-travel arm and repeat
Step 6. Adjust height control
valve as required per
instructions in shop manual.
start to exhaust within 30 seconds.
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test.
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Remove exhaust check valve from
height control valve assembly.
Vehicle Lowers Completely
Figure 11.
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Vehicle does not lower completely
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FIG. 3D-29 AUTOMATIC LEVEL CONTROL DIAGNOSIS
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