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DTC P0403 [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010200400203

DTC P0403 | EGR valve (stepper motor) circuit malfunction
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DETECTION CONDITION | • The PCM monitors the input voltages from EGR valve control signals. If voltage is below or above specified, PCM determines that the EGR valve circuit has malfunction. Diagnostic support note • This is a continuous monitor. (CCM) • MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is not available.
• DTC is not stored in the PCM memory.
POSSIBLE CAUSE | • EGR valve malfunction • Connector or terminal malfunction • Short to ground circuit in wiring between EGR valve terminal E and PCM terminal 12 • Short to ground circuit in wiring between EGR valve terminal A and PCM terminal 72 • Short to ground circuit in wiring between EGR valve terminal B and PCM terminal 46
• Short to ground circuit in wiring between EGR valve terminal F and PCM terminal 56
• Open circuit in wiring between EGR valve terminal E and PCM terminal 12
• Open circuit in wiring between EGR valve terminal A and PCM terminal 72
• Open circuit in wiring between EGR valve terminal B and PCM terminal 46
• Open circuit in wiring between EGR valve terminal F and PCM terminal 56
• Open circuit in wiring between main relay terminal D and EGR valve terminal C
• Open circuit in wiring between main relay terminal D and EGR valve terminal D
• PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to the next step.
No | Go to the next step.
2 | CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN • Turn the ignition switch off, then to the ON position (Engine off). • Is same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [AJ].)
3 | INSPECT EGR VALVE FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect EGR valve connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace terminals and/or connector, then go to Step 8.
No | Go to the next step.
4 | INSPECT POWER CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure the following EGR valve power circuit terminal voltage.

  - EGR valve terminal C and body ground
  - EGR valve terminal D and body ground

• Is the voltage B+?
Yes
Go to the next step.
No | Repair or replace the wiring harness for open circuit then go to Step 8.
5 | INSPECT EGR VALVE • Perform EGR valve inspection. (See EGR VALVE INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).) • Is the EGR valve normal? | Yes | Go to the next step.
No | Replace the EGR valve, then go to Step 8.
6 | INSPECT FOR CONTROL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity at the following EGR valve control circuit.

  - EGR valve terminal E and body ground
  - EGR valve terminal A and body ground
  - EGR valve terminal B and body ground
  - EGR valve terminal F and body ground

• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 8.
No | Go to the next step.
7 | INSPECT CONTROL CIRCUIT FOR OPEN CIRCUIT • Disconnect the PCM connector. • Inspect continuity at the following EGR control circuit.

  - EGR valve terminal E and PCM terminal 12
  - EGR valve terminal A and PCM terminal 72
  - EGR valve terminal B and PCM terminal 46
  - EGR valve terminal F and PCM terminal 56

• Is there continuity?
Yes
Go to the next step.
No | Repair or replace the wiring harness for open circuit then go to the next step.
8 | VERIFY TROUBLESHOOTING OF DTC P0403 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch off, then to the ON position (Engine off). • Is the same DTC present? | Yes | Replace the PCM, then go to the next step.
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Troubleshooting completed.