cvvmax's Garage

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Fault Code Nos.
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Fault Code No.: 28     Diagnostic Code No.: 11

If fault code numbers "28" and "37" are both indicated, take the actions specified for fault code number
"28" first.

Item: Engine temperature sensor: open or short circuit detected.

Fail-Safe System: Able to Start Engine   |   Able to Drive Vehicle

Indicated: Displays the engine temperature.

Procedure: Make sure that the display is close to the ambient temperature during cold starting.

               Probable Cause of                                                       Confirmation of Service
  Item       Malfunction and Check            Maintenance Job              Completion

1
Installed condition of Engine Temperature Sensor Coupler.
Improperly installed sensor

Reinstall or replace the
sensor.
Turn the main switch to "ON".

If, the Fault Code No. is NOT displayed, then Service is Complete.


If however, the Fault Code No. is displayed, then Go To Item 2 below.

2
Connection of ECU coupler.

Check the locking condition
of the coupler.

Disconnect the coupler and
check the pins (bent or broken terminals and locking
condition of the pins).

Improperly connected

Connect the coupler securely or replace the wire harness.
Turn the main switch to "ON".

If, the Fault Code No. is NOT displayed, then Service is Complete.


If however, the Fault Code No. is displayed, then Go To Item 3 below.

3
Wire harness continuity.
Open or short circuit

Replace the wire harness.

Between engine temperature sensor coupler and ECU coupler.
(Brown-Brown)

Between engine temperature sensor coupler and joint coupler.
(Black/Blue-Black/Blue)

Between joint coupler and
ECU coupler.
(Black/Blue-Black/Blue)
Turn the main switch to "ON".

If, the Fault Code No. is NOT displayed, then Service is Complete.


If however, the Fault Code No. is displayed, then Go To Item 4 below.

4
Installed condition of Engine Temperature Sensor.

Check for looseness or pinching.
Improperly installed sensor.

Reinstall or replace the
sensor.

Turn the main switch to "ON".

If, the Fault Code No. is NOT displayed, then Service is Complete.


If however, the Fault Code No. is displayed, then Go To Item 5 below.

5
Defective Engine Temperature Sensor.
Execute the diagnostic
mode. (Code No. 11).

When engine is cold:
Displayed temperature is
close to the ambient temperature.

The displayed temperature is not close to the ambient temperature.

Check the engine
temperature sensor.

Replace if defective.

Turn the main switch to "ON".

If, the Fault Code No. is NOT displayed, then Service is Complete.


If however, the Fault Code No. is displayed, then Go To Item 6 below.

6
Malfunction in ECU.
Replace the ECU.

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