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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P2100 [L3] 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 online 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 CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN 
  • Clear DTC using the WDS or equivalent.
  • Start the engine and let it idle.
  • Is same PENDING CODE present?
 Yes Go to the next step.
No Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
(See INTERMITTENT CONCERN TROUBLESHOOTING .)
4 INSPECT THROTTLE BODY CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect throttle body connector.
  • Check for poor connection (such as damaged, pulled out terminals, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 13.
No Go to the next step.
5 INSPECT THROTTLE VALVE ELECTRICAL MALFUNCTION 
  • Measure resistance between throttle body terminal E and F (part-side).
  • Is resistance approx. 1.3 ohms? 
 Yes Go to the next step.
No Replace throttle body, then go to Step 13.
6 CLASSIFY MALFUNCTION ET POWER SUPPLY CIRCUIT OR CONTROL CIRCUIT 
  • Turn ignition switch to ON (Engine off).
  • Measure voltage between throttle body terminal F (harness-side) and body ground.
  • Is voltage B+  ?
 Yes Malfunction at control circuit. Go to the next step.
No Malfunction at power supply circuit. Go to the next step.
7 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check for poor connection (such as damaged, pulled out terminals, corrosion).
  • Is there any malfunction?
 Yes Repair terminal, then go to Step 13.
No Go to the next step.
8 INSPECT POWER CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Check continuity between throttle body terminal F (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace harness for short to ground, then go to Step 13.
No Go to the next step.
9 INSPECT POWER CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Check continuity between throttle body terminal F (harness-side) and PCM terminal 87(1), 4Y(2) (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 13.
10 INSPECT CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Turn ignition switch to ON (Engine off).
  • Measure voltage between throttle body terminal E (harness-side) and body ground.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power supply, then go to Step 13.
No Go to the next step.
11 INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Check continuity between throttle body terminal E (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace harness for short to ground, then go to Step 13.
No Go to the next step.
12 INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT 
  • Check continuity between throttle body terminal E (harness-side) and PCM terminal 88(1), 4AB(2) (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.
13 VERIFY TROUBLESHOOTING OF DTC P2100 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Turn ignition switch to ON (Engine off).
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start engine and warm it up completely.
  • Is same DTC present?
 Yes Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION .)
No Go to the next step.
14 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No Troubleshooting completed.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
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