DTC P1285, P1299 [MZI-3.7]
id0102d2881800
DTC P1285 DCT P1299 |
P1285: Cylinder head over temperature condition P1299: Cylinder head over temperature protection active |
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DETECTION CONDITION
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• P1285 indicates that an engine overheat condition was sensed by the CHT sensor.
• P1299 indicates that an engine overheat condition was detected by the CHT sensor.
• Fail-safe function was activated to cool the engine.
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POSSIBLE CAUSE
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• Low engine coolant level
• Base engine malfunction
• Engine cooling system malfunction
• CHT sensor malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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INSPECT COOLING SYSTEM
• An engine overheat condition is sensed by the CHT sensor.
• Check the cooling system for:
• Is the cooling system normal?
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Yes
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Go to the next step.
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No
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Repair if necessary. Then go to the next step.
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4
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INSPECT OPERATION OF THE CHT SENSOR
• Run the engine until the engine temperature stabilizes.
• Verify the radiator hoses are hot and the cooling system is pressurized.
• Verify self-test DTCs.
• Is DTC P1285 present?
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Yes
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Go to the next step.
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No
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An engine overheat temperature was not detected. Repair any other DTCs if necessary.
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5
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INSPECT CHT SENSOR
• Inspect the CHT sensor.
• Is there any malfunction?
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Yes
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Replace the CHT sensor, then go to the next step.
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No
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Go to the next step.
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6
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VERIFY TROUBLESHOOTING OF DTC P1285, P1299 HAS BEEN COMPLETED
• Verify that all disconnected connectors are reconnected.
• Turn the ignition switch to the ON position (Engine off).
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and run it at idle.
• Retrieve DTCs using the M-MDS.
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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7
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTC present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7].)
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No
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Troubleshooting completed.
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