ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-59
Diagnostic
If there is damage or disconnection of the heavy-line illuminates and ‘control is as described in the table
circuit, or a short-circuit, or a malfunction of the
out-
put transistor within the ECU, the alarm ligh
t
below. (Note that the diagnostic is only applicable
up to the compressor relay.)
II/6
Diagnostic No.Attitude controlDamping forcecontrol Vehicle-height
control Switch acceptanceHIGH1 SPORT jAUTO) SOF
T
I44
Rolling control only
Held at
stops. MEDIUMRolling control only stoos.
Not accept
Actuator compulsory activation
CodeNo ’Applicable operation Descnption
of activation
06Return pump relay ON
The return pump relay is compulsorily switched ON for a period of three \
seconds.
ECU terminal voltages (when connector is connected) Terminalvoltage
I
3
2
Return pump relay activation signal
When the return pump relay is ON
B+
When the return pump relay is OFF o
v
During fail-safe ov
(solenoid valve power source relay switch OFF)
Checking the return pump drive circuit (with the connector disconnected\
)
B+: Battery positive voltage Connectron
destrnation or Measurementmeasured part Tester connectron
Check condrtronStandard
32Return pump relay
Resistance32-groundConstatly Approx 750INext apply battery voltage to
terminal 32. Return pump
operation
NOTE (Refer to Vol.2 GENERAL for the circuit diagram.)
Procedures for changing the internal pressure of the low-pressure tank
(1) For 70 kPa (IO psi) or lower
Short-circuit the battery power-source @ terminal to the return pump relay @ terminal in order to activate the return
pump for a few seconds, and then leave as is.
(2) For 140 kPa (20 psi) or higher
Short-circuit the battery power-source @ terminal to the front intake-air solenoid @I terminal and the front right
solenoid @I terminal in order to connect the high-pressure tank and low-pressure ta\
nk, and then leave as is for a few
seconds.
Procedures for changing the internal pressure of the high-pressure tank
(I) For 760 kPa (108 psi) or lower
Short-circuit the battery power-source @I terminal to the discharge-air solenoid (for vehicle-height adjustment)\
@Iterminal, the front intake-air solenoid @I terminal and the front right solenoid @ terminal and the front discharge-air
solenoid @I terminal in order to release the atmosphere inside the high-pressure ta\
nk, and then leave as is for a few
seconds.
(2) For 950 kPa (135 psi) or higher
Short-circuit the battery power-source @ terminal to the compressor relay @ terminal in order to activate the
compressor for a few seconds, and then leave as is.
Troubleshooting hints (mechanical malfunctions)
Malfunctionmode Malfunction probable cause
Malfunction
Note
1
The return pumpThe return pump relay contacts are shorted.
relay is fused The return pump won’t stop, causing the
battery to discharge.
The return pump is The return pump won’t operate due to short-
* Insufficient attitude-control effect.
-
stuck.ing.
etc. l
Vehicle height increases after rolling control.
TSB Revision
