LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 634 (On-Board Diagnostic (Engine Control System L5) (2 Of 5)) >> DTC P0138:00 [L5] >> 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 AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on 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 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 VERIFY RELATED PENDING OR STORED DTC 
  • Switch the ignition to off, then to the ON (engine off).
  • Verify pending code or stored DTCs using the M-MDS
  • Are any other DTCs present?
 Yes Go to the applicable DTC inspection,
(See DTC TABLE [L5] .)
No Go to the next step.
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is the DTC P0138.00 on FREEZE FRAME DATA?
 Yes Go to the next step.
No Go to troubleshooting procedures for DTC on FREEZE FRAME DATA
(See DTC TABLE [L5] .)
5 INSPECT HO2S CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the HO2S connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 10.
No Go to the next step.
6 INSPECT PCM CONNECTOR CONDITION 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 10.
No Go to the next step
7 INSPECT HO2S CIRCUIT FOR SHORT EACH OTHER 
  • Inspect for continuity between HO2S terminal A and B (wiring harness-side)
  • Is there continuity?
 Yes Repair or replace the malfunctioning wiring harness, then go to Step 10.
No Go to the next step
8 INSPECT HO2S SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the disconnected connectors.
  • Switch the ignition to ON (engine off)
  • Measure the voltage between HO2S terminal A (wiring harness-side) and body ground.
  • Is the voltage above 1.2 V  ?
 Yes Repair or replace the wiring harness for a short to power supply, then go to Step 10.
No Go to the next step.
9 INSPECT HO2S 
 Yes Replace the HO2S, then go to the next step.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L5] .)
No Go to the next step.
10 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS
  • Perform the KOEO/KOER self test.

    (See KOEO/KOER SELF TEST [L5] .)

  • Is the PENDING CODE for this DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L5] .)
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [L5] .)
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals