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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 632 (On-Board Diagnostic (Engine Control System MZI-3.7) (5 Of 5)) >> DTC P164B:00 [MZI-3.7] >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
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 the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related Service Bulletins available?
 Yes Perform repair or diagnosis according to the available Service Bulletins
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT A/F SENSOR (LH) CONNECTOR FOR POOR CONNECTION 
  • Switch the ignition to off
  • Disconnect the A/F sensor (LH) connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Are there any malfunction?
 Yes Repair or replace suspected part, then go to Step 7.
No Go to the next step.
4 INSPECT A/F SENSOR (LH) PUMPING CURRENT TRIM CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS 
  • Disconnect the A/F sensor (LH) connector.
  • Disconnect the PCM connector
  • Measure the resistance between A/F sensor (LH) wiring harness-side connector terminal 1 and PCM harness-side connector terminal 2BF.
  • Is the resistance less than 5 ohms?
 Yes Go to the next step.
No Repair for an open circuit, then go to Step 7.
5 INSPECT A/F SENSOR (LH) PUMPING CURRENT TRIM CIRCUIT FOR SHORT CIRCUIT TO GROUND 
  • Measure the resistance between A/F sensor (LH) wiring harness-side connector terminal 1 and ground.
  • Is the resistance greater than 10 kilohms?
 Yes Go to the next step.
No Repair a short to the ground circuit, then go to Step 7.
6 INSPECT RESISTANCE OF LABEL RESISTOR IN A/F SENSOR 
  • Measure the resistance between A/F sensor connector terminal 1 and 2 on the component side.
  • Is the resistance between 3.5-1, 000 kilohms?
 Yes Perform the "INTERMITTENT CONCERN TROUBLESHOOTING"
(Unable to duplicate or identify the concern at this 1 time.)
Then go to the next step.
No Replace the suspect A/F sensor (LH).
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7] .)
Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P164B:00 HAS BEEN COMPLETED 
  • Verify that all disconnected connectors are reconnected.
  • Switch the ignition to ON (Engine off).
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the KOEO/KOER self-test.

    (See KOEO/KOER SELF TEST [MZI-3.7] .)

  • Is the same DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
No Go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No Troubleshooting completed.
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