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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 P0113 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT IAT SENSOR (BP), IAT SENSOR No.1 (BP WITH TC) CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect IAT sensor (BP), IAT sensor No.1 (BP WITH TC) connector.
  • 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.
4 INSPECT IAT SENSOR (BP) IAT SENSOR No.1 (BP WITH TC) 
  • Inspect the IAT sensor (BP), IAT sensor No.1 (BP WITH TC).
  • Is there any malfunction?
 Yes Replace IAT sensor (BP), IAT sensor No.1 (BP WITH TC), then go to Step 10.
No Go to the next Step.
5 INSPECT IAT SENSOR (BP), IAT SENSOR No.1 (BP WITH TC) SIGNAL CIRCUIT FOR SHORT TO POWER 
  • Turn ignition key to ON (Engine off).
  • Measure voltage between IAT sensor (BP), IAT sensor No.1 (BP WITH TC) terminal B (harness-side) and body GND.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power, then go to Step 10.
No Go to the next step.
6 INSPECT IAT SENSOR (BP), IAT SENSOR No.1 (BP WITH TC) GROUND CIRCUIT FOR SHORT TO POWER 
  • Measure voltage between IAT sensor (BP), IAT sensor No.1 (BP WITH TC) terminal A (harness-side) and body GND.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power, then go to Step 10.
No Go to the next step.
7 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Inspect tightness of PCM terminal 4N and 4O (harness-side) using feeler tool.
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
8 INSPECT IAT SENSOR (BP), IAT SENSOR No.1 (BP WITH TC) SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Disconnect PCM connector.
  • Check continuity between IAT sensor (BP), IAT sensor No.1 (BP WITH TC) terminal B (harness-side) and PCM terminal 4N (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 10.
9 INSPECT IAT SENSOR (BP), IAT SENSOR No.1 (BP WITH TC) GND CIRCUIT FOR OPEN CIRCUIT 
  • Check continuity between IAT sensor (BP), IAT sensor No.1 (BP WITH TC) terminal A (harness-side) and PCM terminal 4O (harness-side).
  • Is there continuity?
 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 P0113 COMPLETED 
  • Make sure to connect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start 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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