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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.
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
Item Malfunction and Check Maintenance Job Completion
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1
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Installed condition of Engine Temperature Sensor Coupler.
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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. |
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2
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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. |
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3
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Wire harness continuity.
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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. |
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4
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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. |
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5
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Defective Engine Temperature Sensor.
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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. |
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6
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Malfunction in ECU.
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Replace the ECU.
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