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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1487 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnostic according to the available repair information.
  • If the vehicle is not repaired, then go to the next step.
No Go to the next step.
2 DETERMINE IF INTERMITTENT CONCERN OR CONTINUOUS CONCERN 
  • Turn ignition key to OFF then ON (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 )
3 DETERMINE IF OPEN CIRCUIT OR SHORT TO GROUND MALFUNCTION 
  • Disconnect EGR boost sensor solenoid valve tube at solenoid side that connects to EGR valve.
  • Connect vacuum pump to EGR boost solenoid valve.
  • Apply vacuum.
  • Wait for 5 s. 
  • Is vacuum maintained?
 Yes Go to Step 5.
No Go to the next step.
4 INSPECT EGR BOOST SENSOR SOLENOID VALVE FOR PASSAGE CONTROL 
  • Turn the ignition switch off.
  • Disconnect EGR boost sensor solenoid valve connector.
  • Apply vacuum and wait for 5 s. 
  • Is vacuum maintained?
 Yes Repair or replace harness between solenoid valve terminal B and PCM terminal 3D for short to GND, then go to Step 10.
No Replace EGR boost sensor solenoid valve, then go to Step 10.
5 INSPECT EGR BOOST SENSOR SOLENOID VALVE CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
6 INSPECT EGR BOOST SENSOR SOLENOID VALVE 
  • Measure resistance between EGR boost sensor solenoid valve terminals (part-side).
  • Is resistance within 23-27 ohms  ?
 Yes Go to the next step.
No Replace EGR boost sensor solenoid valve, then go to Step 10.
7 INSPECT EGR BOOST SENSOR SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Turn ignition key to ON (Engine off).
  • Measure voltage between EGR boost sensor solenoid valve terminal A (harness-side) and body GND.
  • Is voltage B+  ?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 10.
8 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check for poor connection at terminal 3D (damaged, pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair terminal, then go to Step 10.
No Go to the next step.
9 INSPECT EGR BOOST SENSOR SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • Connect EGR boost sensor solenoid valve connector.
  • Disconnect PCM connector.
  • Turn ignition key to ON (Engine off).
  • Measure voltage between PCM terminal 3D (harness-side) and body GND.
  • Is voltage B+  ?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to the next step.
10 VERIFY TROUBLESHOOTING OF DTC P1487 COMPLETED 
  • Make sure to connect all disconnected connectors.
  • Turn ignition key to OFF then ON (Engine off).
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start the engine.
  • Is same DTC present?
 Yes Replace PCM, then go to the next step.
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE )
No Troubleshooting completed.
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