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DTC P0030 [L8, LF, L3]

id0102a1801900

DTC P0030 | A/F sensor heater control circuit problem
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DETECTION CONDITION | • OBD system monitors the output signal voltage from A/F sensor which is proportion to the element impedance of A/F sensor. • If the output signal voltage isn't between 0.75 V and 1.5 V after specified time from engine start, heater performance considered failed. MONITORING CONDITIONS - Battery voltage: 10-18 V - Time from engine start is 74 s or more 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 is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • A/F sensor heater malfunction • Connector or terminal malfunction • Short to ground in wiring harness between A/F sensor terminal 2D and PCM terminal 2BG • Short to power supply in wiring harness between A/F sensor terminal 2D and PCM terminal 2BG • Open circuit in wiring harness between A/F sensor terminal 1B and PCM terminal 2AC • Open circuit in wiring harness between A/F sensor terminal 2D and PCM terminal 2BG • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED PENDING CODE OR STORED DTC • Turn the ignition switch off, then to the ON position (Engine off). • Verify the related PENDING CODE or stored DTCs using the WDS or equivalent. • Is the DTC P0031 or P0032 also present? | Yes | Go to appropriate DTC troubleshooting procedure. (See DTC TABLE [L8, LF, L3].)
No | Go to the next step.
4 | IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0030 on FREEZE FRAME DATA? | Yes | Go to the next step.
No | Go to troubleshooting for DTC on FREEZE FRAME DATA. (See DTC TABLE [L8, LF, L3].)
5 | INSPECT A/F SENSOR CONNECTOR FOR POOR CONNECTION • 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? | Yes | Repair or replace the terminal, then go to Step 11.
No | Go to the next step.
6 | INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO GROUND • A/F sensor connector disconnected. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there continuity? | Yes | Repair or replace for short to ground, then go to Step 11.
No | Go to the next step.
7 | INSPECT A/F SENSOR HEATER • Inspect the A/F sensor heater. (See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L8, LF, L3].) • Is there any malfunction? | Yes | Replace the A/F sensor, then go to Step 11. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [L8, LF, L3 2WD].) (See EXHAUST SYSTEM REMOVAL/INSTALLATION [L3 4WD].)
No | Go to the next step.
8 | 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, and corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step11.
No | Go to the next step.
9 | INSPECT A/F SENSOR CIRCUIT FOR OPEN • A/F sensor and PCM connectors disconnected. • Measure the continuity following circuit at wiring harness-side terminal. - Between A/F sensor terminal 2D and PCM terminal 2BG - Between A/F sensor terminal 1B and PCM terminal 2AC • Are there continuity? | Yes | Go to the next step.
No | Repair or replace for open, then go to Step 11.
10 | INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO POWER • A/F sensor and PCM connectors disconnected. • Measure the voltage between A/F sensor terminal 2D (wiring harness-side) and ground? • Is the voltage greater than 1.5V | Yes | Repair or replace for short to power, then go to the next step.
No | Go to the next step.
11 | VERIFY TROUBLESHOOTING OF DTC P0030 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [L8, LF, L3].) • Is the DTC P0030 present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | DTC troubleshooting completed.