LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> On-Board Diagnostic - Pcm (VIN C & VIN D) (4 Of 5) >> DTC P2097-00: Ho2S Fuel Injection Control System: Air Fuel Too Rich >> Troubleshooting Diagnostic Procedure

Troubleshooting Diagnostic Procedure

P2097: 00 (PCM (H3T)) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 PURPOSE: VERIFY IF HO2S IS INSTALLED CORRECTLY  Yes Go to the next step.
No Correctly install the HO2S and perform the repair completion verification 1.
(Refer to [HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION ] in service information).
2 PURPOSE: VERIFY IF A/F SENSOR IS INSTALLED CORRECTLY  Yes Replace the A/F sensor and/or HO2S and perform the repair completion verification 1.
(Refer to [AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ] in service information).
(Refer to [HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION ] in service information).
No Correctly install the A/F sensor and perform the repair completion verification 1.
(Refer to [AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ] in service information).
3 PURPOSE: INSPECT FUEL INJECTOR OPERATION 
  • In Step 10 of the function inspection using the M-MDS, perform a fail-safe injector operation inspection on the cylinders in which engine speed fluctuation could not be verified. (Refer to [FUEL INJECTOR INSPECTION ] in service information).
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification 1.
(Refer to [FUEL INJECTOR REMOVAL/INSTALLATION ] in service information).
No Go to the next step.
4 PURPOSE: INSPECT PURGE SOLENOID VALVE FOR MALFUNCTION  Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification 1.
(Refer to [PURGE SOLENOID VALVE REMOVAL/INSTALLATION ] in service information.)
5 PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM AFFECTS DIAGNOSTIC RESULTS 
  • Visually inspect for leakage from fuel line between fuel distributor and fuel pump.
  • Is there any leakage?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification 1.
No Go to the next step.
6 PURPOSE: INSPECT FUEL LINE (LOW-SIDE) 
  • Inspect for leakage or restriction in the fuel line (low-side).
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification 1.
No Go to the next step.
7 PURPOSE: VERIFY IF HO2S IS INSTALLED CORRECTLY  Yes Go to the next step.
No Correctly install the HO2S and perform the repair completion verification 1.
(Refer to [HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION ] in service information).
8 PURPOSE: VERIFY IF A/F SENSOR IS INSTALLED CORRECTLY  Yes Go to the next step.
No Correctly install the A/F sensor and perform the repair completion verification 1.
(Refer to [AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ] in service information).
9 PURPOSE: INSPECT EXHAUST SYSTEM FOR LEAKAGE 
  • Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S)
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning location and perform the repair completion verification 1.
No Go to the next step.
10 PURPOSE: INSPECT MAP SENSOR FOR MALFUNCTION  Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification 1.
(Refer to [MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 2 REMOVAL/INSTALLATION ] in service information).
11 PURPOSE: INSPECT MAF SENSOR FOR  Yes Go to the next step.
No Repair or replace the malfunctioning location and perform the repair completion verification 1.
(Refer to [MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ] in service information).
12 PURPOSE: INSPECT AIR CLEANER ELEMENT FOR MALFUNCTION  Yes Inspect the air cleaner element. (Refer to [AIR CLEANER ELEMENT INSPECTION ] in service information).
  • If there is any malfunction:
  • If there is no malfunction:
    • Go to repair completion verification 1.
No Go to the next step.
Repair completion verification 1 PURPOSE: VERIFY THAT VEHICLE IS REPAIRED 
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
  • Perform the DTC inspection for the PCM. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .)
If the CAN communication is normal, perform the diagnosis from Step 1.
  • If the malfunction recurs, replace the PCM, then go to the next step. (Refer to [PCM REMOVAL/INSTALLATION ] in service information).
No Go to the next step.
Repair completion verification 2 PURPOSE: VERIFY IF OTHER DTCs DISPLAYED 
  • Perform the DTC inspection. (See DTC INSPECTION .)
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals