Code No.32: G-sensor System
OPERATION
The G-sensor detects the acceleration level in the
forward/reverse direction of the vehicle, converts the signals into
voltage signals and then sends that signal to the ABS-ECU.
DIAGNOSIS CODE SET CONDITIONS
This code is set in the following
case.
- When the G sensor output voltage becomes 0.3 V or less or 4.7 V or more
for 1 second or more, the ABS-ECU determines that the G sensor circuit is
open or short, and sets this diagnosis code.
- With the vehicle speed 10 km/h or more and with the stop lamp
switch signal OFF, when the measured longitudinal G is 0.4 G or more, the
ABS-ECU determines that the G sensor output is stuck, and sets this
diagnosis code.
PROBABLE CAUSES
- Malfunction of the G-sensor
- Damaged wiring harness or connector
- Malfunction of the ABS-ECU
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STEP 1. M.U.T.-III data list
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Set M.U.T.-III to data reading mode, and check
the data list item.
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OK:
When vehicle is
stationary (level): 2.4 - 2.6 V
When vehicle is being driven:
1.0 - 4.0 V
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Q.
Is the check result normal?
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 Go to Step 7.
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 Go to Step 2.
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STEP 2. Measure the voltage at G-sensor connector D-41.
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(1)Disconnect G-sensor connector D-41, and measure at the
harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure voltage between terminal 1 and
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the harness wire between junction connector D-34 terminal
No.172 and G-sensor connector D-41 terminal No.1.
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After inspecting G-sensor connector D-41, junction
connector D-34 and intermediate connector D-228, inspect the wire. If
G-sensor connector D-41, junction connector D-34 and intermediate
connector D-228 is damaged, repair or replace it.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair
or replace it.
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STEP 4. Check G-sensor output voltage.
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(1)Park the vehicle on a level surface.
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(2)Disconnect ABS-ECU connector D-251, and measure the
harness side.
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(3)Turn the ignition switch to the "ON" position.
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(4)Measure the voltage between terminal 4 and
18.
OK: 2.5 ± 0.15 V
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 5.
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STEP 5. Check G-sensor output voltage.
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(1)Disconnect connector D-41, and connect special tool
harness set (MB991348) between terminals of the disconnected
connector.
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(2)Connect the tool so that the arrow of the
label on the G sensor faces downward as shown.
(3)Turn the ignition
switch to the "ON" position.
(4)Measure the voltage between terminal 2
and 3.
OK: 3.5 ± 0.15 V
Q.
Is the check result normal?
Go to Step 6.
Replace the G-sensor.
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STEP 6. Check the harness wire between G-sensor connector D-41 and
ABS-ECU connector D-251.
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After inspecting G-sensor connector D-41, ABS-ECU
connector D-251 and intermediate connector D-225, inspect the wire. If
G-sensor connector D-41, ABS-ECU connector D-251 and intermediate
connector D-225 is damaged, repair or replace it.
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Check the wiring harness between connectors as
follows for open or short circuit.
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- G-sensor connector D-41 terminal No.2 - ABS-ECU connector D-251
terminal No.4
- G-sensor connector D-41 terminal No.3 - ABS-ECU connector D-251
terminal No.18
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Q.
Is the check result normal?
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Go to Step 7.
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Repair
or replace it.
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STEP 7. Check whether the diagnosis code is reset.
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(1)Drive the vehicle with speed exceeds 10
km/h.
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(2)Check if the diagnosis code is reset.
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Replace the ABS-ECU.
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The
procedure is complete.
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