DTC P0642:00 [MZI-3.7]
id0102d2315500
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DTC P0642:00 |
Sensor reference voltage circuit low |
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DETECTION CONDITION
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• Indicates the reference voltage circuit is lower than reference voltage minimum.
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POSSIBLE CAUSE
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• Fuel tank pressure sensor connector or terminal malfunction
• PCM connector or terminal malfunction
• Short to ground between fuel tank pressure sensor terminal A and PCM terminal 1D
• Fuel tank pressure 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 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 FUEL TANK PRESSURE SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the fuel tank pressure sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are there any malfunction?
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Yes
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Repair or replace suspected part, then go to Step 7.
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No
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Go to the next step.
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4
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/ pulled-out pins, corrosion).
• Are there any malfunction?
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Yes
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Repair or replace suspected part, then go to Step 7.
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No
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Go to the next step.
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5
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INSPECT FUEL TANK PRESSURE SENSOR CIRCUIT FOR SHORT TO GROUND
• Fuel tank pressure and PCM connectors are disconnected.
• Turn the ignition switch off.
• Inspect the continuity between fuel tank pressure sensor terminal A (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Repair or replace suspected part, then go to Step 7.
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No
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Go to the next step.
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6
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INSPECT FUEL TANK PRESSURE SENSOR
• Inspect the fuel tank pressure sensor.
• Is there any malfunction?
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Yes
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Replace the evaporative hose component, 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 TROUBLESHOOTING OF DTC P0642:00 HAS BEEN COMPLETED
• Verify that all disconnected connectors reconnected.
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the KOEO or KOER self-test.
• Is the PENDING CODE for the DTC present?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the PCM.
Go to the next step.
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs 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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