DTC P0030 [L8, LF]
id0102b1801900
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DTC P0030 |
A/F sensor heater control circuit problem |
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DETECTION CONDITION
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• The PCM monitors the A/F sensor impedance when under the A/F sensor heater control for 410 s. If the impedance is more than 44 ohms, the PCM determines that there is a A/F sensor heater control circuit problem.
Diagnostic support note
• This is an intermittent monitor (A/F sensor heater, HO2S heater).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA (Mode 2/Mode 12) is available.
• The DTC is stored in the PCM memory.
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POSSIBLE CAUSE
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• A/F sensor connector or terminals malfunction
• A/F sensor heater malfunction
• PCM connector or terminals 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 (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor heater, HO2S heater related) 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 the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on 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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VERIFY RELATED PENDING CODE AND STORED DTC
• Turn the ignition switch off, then to the ON position (engine off).
• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
• Is the DTC P0031 or P0032 also present?
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Yes
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Go to the applicable DTC troubleshooting.
(See DTC P0031 [L8, LF].)
(See DTC P0032 [L8, LF].)
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No
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Go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)
• Perform the Freeze Frame PID Data Access Procedure.
• Is the DTC P0030 on FREEZE FRAME DATA (Mode 2)?
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Yes
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Go to the next step.
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No
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Go to the DTC troubleshooting on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [L8, LF].)
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5
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INSPECT A/F SENSOR CONNECTOR AND TERMINALS
• Turn the ignition switch off.
• Disconnect the A/F sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the connector or terminals, then go to Step 8.
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No
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Go to the next step.
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6
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INSPECT A/F SENSOR HEATER
• Inspect the A/F sensor heater.
• Is there any malfunction?
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Yes
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Replace the A/F sensor, then go to Step 8.
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No
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Go to the next step.
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7
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INSPECT PCM CONNECTOR AND TERMINALS
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the connector or terminals, then 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 DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the KOEO/KOER self test.
(See KOEO/KOER SELF TEST [L8, LF].)
• 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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9
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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 troubleshooting.
(See DTC TABLE [L8, LF].)
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No
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DTC troubleshooting completed.
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