2 - 80 SUSPENSION/DRIVESHAFTS
DIAGNOSIS
INITIAL DIAGNOSTIC CHECK
(1)Check for blown or missing fuses.
(2)Check all connectors for correct assembly.
Check all connectors for incorrectly installed terminals.
(3)Check pin #21 for minimum of 9.5 volts.
(4)Check pin #20 for minimum of 9.5 volts (with ignition key on).
(5)Check voltage at pins #5 and #16. The measurement should exceed 0 volts.
(6)Check pin #19 for continuity.
(7)The engine speed should exceed 680 rpm during
idle.
All doors and trunk must be closed for the system to function.
DIAGNOSTICS PROCEDURES
(1)Use the D.R.B. II tester and the 1991 air suspension diagnostic service cartridge to begin the troubleshooting process.
(2)Use the D.R.B. mating connector under the dash (drivers side) to plug-in the D.R.B. II test connector (Fig. 10).
(3)The tester will conduct a complete check of the suspension system status.
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(4)The tester will list the steps to follow to access and diagnose the failure.
(5)A Volt/Ohm meter can be used for some diagnostic testing.
HEIGHT SENSOR CHECK
If a sensor signal/signals are missing. Follow the repair procedure listed below.
(1)Check ground circuit continuity. (Remember front and rear grounds are on different circuits.
(2)For front ground circuit continuity check circuit
S 33.
(3)For rear ground circuit continuity check circuit
X20.
(4)Refer to control module pin out chart and wiring diagram (see wiring diagram, Group 8F in wiring diagram manual) for individual circuit details.
(5)If open circuits are not found replace the compo-
nent.
Complete circuit testing and connector assemblies before replacing a strut or right rear shock.
(6)To measure resistance values, see Height Sensor Logic Chart and Initial Diagnostic Check in System Operation.
HEIGHT SENSOR LOGIC CHART
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Fig. 10 Control Module Connector
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AUTOMATIC AIR SUSPENSION DIAGNOSTICS
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