DTC P1121[AJ (3.0L Duratec)]
id0102a4822700
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DTC P1121 |
TP sensor inconsistent with MAF sensor |
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DETECTION CONDITION
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• The PCM compares the actual input signal from the MAF sensor with the expected input signal from the MAF sensor which the PCM calculates by the input voltage from the throttle position sensor or engine speed.
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POSSIBLE CAUSE
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• TP sensor malfunction
• MAF sensor malfunction
• PCM malfunction
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Diagnostic procedure
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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 next step.
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No
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Record FREEZE FRAME DATA on repair order, then go to next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for 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 available Service Information.
• If vehicle is not repaired, go to next step.
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No
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Go to next step.
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3
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VERIFY OTHER DTC PRESENT
• Is DTC P0102, P0103, P0122, or P0123 present?
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Yes
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Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
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No
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Go to next step.
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4
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INSPECT MAF SENSOR
• Inspect the MAF sensor.
• Is there any malfunction?
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Yes
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Replace MAF/IAT sensor, then go to next step.
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No
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Go to next step.
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5
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INSPECT TP SENSOR
• Inspect the TP sensor.
• Is there any malfunction?
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Yes
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Replace throttle body, then go to next step.
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No
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Go to next step.
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6
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VERIFY TROUBLESHOOTING OF DTC P1121 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using M-MDS.
• Start engine.
• Perform “KOEO/KOER self-test”
• Is same DTC present?
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Yes
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Replace PCM, then go to next step.
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No
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Go to next step.
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7
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VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is there any DTC present?
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Yes
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Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
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No
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Troubleshooting completed.
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