VDC(diag)-128
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK STOP LIGHT SWITCH CIRCUIT.
Check stop light switch open circuit.
Is the stop light switch circuit
OK?
Go to step 2.
If there is malfunc-
tion in the stop
light switch circuit,
DTC may be
recorded in the
memory.
2
CHECK PRESSURE SENSOR POWER SUP-
PLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from pressure
sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between pressure
sensor connector and chassis ground.
Connector & terminal
(B348) No. 3 (+) — Chassis ground (
−
):
Is the voltage 4.75 — 5.25 V?
Go to step 5.
Go to step 3.
3
CHECK OUTPUT VOLTAGE OF VDCCM&H/
U.
Measure the voltage between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 27 (+) — Chassis ground (
−
):
Is the voltage 4.75 — 5.25 V?
Repair the har-
ness between
pressure sensor
and VDCCM&H/U.
Go to step 4.
4
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
Go to step 10.
5
CHECK GROUND CIRCUIT OF PRESSURE
SENSOR.
Measure the resistance between pressure
sensor and chassis ground.
Connector & terminal
(B348) No. 1 — Chassis ground:
Is the resistance less than 0.5
Ω
?
Go to step 8.
Go to step 6.
6
CHECK GROUND CIRCUIT OF VDCCM&H/U.
Measure the resistance between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 12 — Chassis ground:
Is the resistance less than 0.5
Ω
?
Repair the har-
ness between
pressure sensor
and VDCCM&H/U.
Go to step 7.
7
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
Go to step 10.
8
CHECK PRESSURE SENSOR HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Measure the resistance between
VDCCM&H/U and pressure sensor.
Connector & terminal
(B310) No. 11 — (B348) No. 2:
Is the resistance less than 0.5
Ω
?
Go to step 9.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
9
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 11 — Chassis ground:
Is the resistance more than 1
M
Ω
?
Go to step 10.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
10
CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is DTC displayed?
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 11.
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