{"id":10010,"date":"2022-03-10T20:30:52","date_gmt":"2022-03-10T20:30:52","guid":{"rendered":"https:\/\/www.hexorcism.com\/19BP\/sm2565565\/"},"modified":"2022-03-10T20:30:52","modified_gmt":"2022-03-10T20:30:52","slug":"sm2565565","status":"publish","type":"page","link":"https:\/\/www.hexorcism.com\/19BP\/sm2565565\/","title":{"rendered":"DTC P0421:00 [PCM (SKYACTIV-G (US))]"},"content":{"rendered":"
\n

DTC P0421:00 [PCM (SKYACTIV-G (US))]<\/h3>\n<\/div>\n

SM2565565<\/p>\n

<\/p>\n
\n
\n
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id0102t47044u0<\/p>\n

\n
\n
Note<\/div>\n<\/dd>\n
\n
\u2022 To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.<\/div>\n<\/dd>\n<\/dl>\n



\n<\/a><\/p>\n

Details On DTCs<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Description<\/p>\n<\/th>\n

\n

Catalytic converter system<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
Detection condition<\/span><\/div>\n<\/td>\n
\n
Determination conditions<\/div>\n<\/td>\n
\n
\u2022 The PCM detects that the HO2S output fluctuates from lean to rich in a short amount of time at specified times continuously after recovery from fuel cut control.<\/div>\n<\/td>\n<\/tr>\n
\n
Preconditions<\/div>\n<\/td>\n
\n
\u2022 Catalytic converter (WU-TWC) is activated sufficiently.<\/div>\n
\u2022 A\/F sensor is activated sufficiently.<\/div>\n
\u2022 HO2S is activated sufficiently.<\/div>\n
\u2022 The following DTCs are not detected:<\/div>\n
\n
\n
\u2015 Misfire: P0300:00, P0301:00, P0302:00, P0303:00 and P0304:00<\/div>\n
\u2015 Fuel injection correction: P0171:00, P0172:00, P2096:00 and P2097:00<\/div>\n
\u2015 A\/F sensor: P0130:00, P0131:00, P0132:00, P0133:00, P0134:00, P064D:00, P2237:00, P2243:00 and P2251:00<\/div>\n
\u2015 HO2S: P0137:00, P0138:00, P013A:00, P013B:00 and P0140:00<\/div>\n
\u2015 A\/F sensor heater: P0031:00 and P0032:00<\/div>\n
\u2015 HO2S heater: P0037:00 and P0038:00<\/div>\n<\/dd>\n<\/dl>\n<\/td>\n<\/tr>\n
\n
Drive cycle<\/div>\n<\/td>\n
\n
\u2022 1<\/span> (U.S.A.)<\/div>\n
\u2022 2<\/span> (except U.S.A.)<\/div>\n<\/td>\n<\/tr>\n
\n
Self test type<\/div>\n<\/td>\n
\n
\u2022 CMDTC self test<\/div>\n<\/td>\n<\/tr>\n
\n
Sensor used<\/div>\n<\/td>\n
\n
\u2022 A\/F sensor, HO2S<\/div>\n<\/td>\n<\/tr>\n
\n
Fail-safe function<\/span><\/div>\n<\/td>\n
\n
\u2022 Not applicable<\/div>\n<\/td>\n<\/tr>\n
\n
Vehicle status when DTCs are output<\/span><\/div>\n<\/td>\n
\n
\u2022 Not applicable<\/div>\n<\/td>\n<\/tr>\n
\n
Possible cause<\/span><\/div>\n<\/td>\n
\n
\u2022 HO2S malfunction<\/div>\n
\n
\n
\u2015 HO2S incorrect installation<\/div>\n<\/dd>\n<\/dl>\n
\u2022 A\/F sensor malfunction<\/div>\n
\n
\n
\u2015 A\/F sensor incorrect installation<\/div>\n
\u2015 Exhaust system leakage<\/div>\n
\u2015 A\/F sensor deterioration<\/div>\n<\/dd>\n<\/dl>\n
\u2022 WU-TWC deterioration or malfunction<\/div>\n
\u2022 PCM malfunction<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

System Wiring Diagram<\/p>\n

\u2022 Not applicable<\/div>\n



\n<\/a><\/p>\n

Function Explanation (DTC Detection Outline)<\/p>\n

\u2022 The PCM monitors the oxygen storage amount proportional to the catalytic converter purification characteristic.<\/div>\n
\u2022 The PCM starts to monitor after recovery (fuel injection starts) from fuel cut control during deceleration.<\/div>\n
\u2022 The PCM temporarily changes the target air\/fuel ratio to rich at recovery from fuel cut control, and detects the response time until the HO2S output signal outputs the voltage on the rich side.<\/div>\n
\u2022 If the catalytic converter purification characteristic deteriorates, the amount of time until the HO2S detects the voltage on the rich side is shorter compared to the normal purification characteristic as shown in the figure.<\/div>\n
\u2022 The PCM detects a catalytic converter malfunction using this characteristic.<\/div>\n\n\n\n
\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzw00033734<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

Repeatability Verification Procedure<\/p>\n

1. Start the engine and leave it idling for 1 min<\/span>.<\/div>\n
2. Drive the vehicle normally for 15 min<\/span>. After that, shift to 3rd gear and maintain the vehicle speed at approx. 40 km\/h {25 mph}<\/span>.<\/div>\n
3. Accelerate the vehicle to 60 km\/h {37 mph}<\/span> while in 3rd gear.<\/div>\n
4. Release the accelerator pedal and decelerate the vehicle to 40 km\/h {25 mph}<\/span>.<\/div>\n
5. Accelerate the vehicle to 60 km\/h {37 mph}<\/span> again while in 3rd gear.<\/div>\n
6. Drive the vehicle for 20 s<\/span> at a speed of 50 km\/h {31 mph}<\/span> while in 3rd gear.<\/div>\n
7. Repeat Step 4 to 6 operations above 20 times<\/span>.<\/p>\n
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\n
Note<\/div>\n<\/dd>\n
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\u2022 Match the engine coolant temperature in the recorded freeze frame data\/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n
8. Try to reproduce the malfunction by driving the vehicle for 5 min<\/span> based on the values in the freeze frame data\/snapshot data.<\/div>\n



\n<\/a><\/p>\n

PID Item\/Simulation Item Used In Diagnosis<\/p>\n

\n

PID\/DATA monitor item table<\/p>\n\n\n\n\n\n\n
\n

PIDs<\/p>\n<\/th>\n

\n

Reference<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
A\/F_SEN_CUR<\/div>\n<\/td>\n
\n
(See PID\/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
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HO2S_OUT_VOLT<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

Function Inspection Using M-MDS<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Step<\/p>\n<\/th>\n

\n

Inspection<\/p>\n<\/th>\n

\n

Results<\/p>\n<\/th>\n

\n

Action<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
1<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY<\/div>\n
\u2022 Verify related Service Bulletins, on-line repair information, or Service Information availability.<\/div>\n
\u2022 Is any related Information available?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Perform repair or diagnosis according to the available information.<\/div>\n
\u2022 If the vehicle is not repaired, go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
2<\/div>\n<\/td>\n
\n
PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA<\/div>\n
\u2022 Is the DTC P0421:00 on freeze frame data?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the troubleshooting procedure for DTC on freeze frame data.<\/div>\n
(See DTC TABLE [PCM (SKYACTIV-G (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
3<\/div>\n<\/td>\n
\n
PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION<\/div>\n
\u2022 Record the freeze frame data\/snapshot data and diagnostic monitoring test results (catalyst related).<\/p>\n
\n
\n
Note<\/div>\n<\/dd>\n
\n
\u2022 Recording can be facilitated using the screen capture function of the PC.<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n<\/td>\n
\n
\u2014<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
4<\/div>\n<\/td>\n
\n
PURPOSE: INSPECT FOR OTHER RELATED DTCs<\/div>\n
\u2022 Perform the DTC inspection for the PCM. (See DTC INSPECTION<\/a>.)<\/div>\n
\u2022 Are any other DTCs displayed?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Repair the malfunctioning location according to the applicable DTC troubleshooting.<\/div>\n
(See DTC TABLE [PCM (SKYACTIV-G (US))]<\/a>.)<\/div>\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
5<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY A\/F SENSOR AND HO2S INPUT SIGNAL<\/div>\n
\u2022 Start the engine and warm it up completely.<\/div>\n
\u2022 Access the following PIDs using the M-MDS: (See PID\/DATA MONITOR INSPECTION<\/a>.)<\/div>\n
\n
\n
\u2015 A\/F_SEN_CUR<\/div>\n
\u2015 HO2S_OUT_VOLT<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Drive the vehicle under the following conditions.<\/p>\n
\n
\n
Warning<\/div>\n<\/dd>\n
\n
\n
\u2022 When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID\/DATA MONITOR AND RECORD capturing function and inspect later.<\/div>\n
\u2022 While performing this step, always operate the vehicle in a safe and lawful manner.<\/div>\n<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n
\n
\n
\u2015 After increasing the engine speed to 3,000 rpm<\/span>, decelerate using engine braking.<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Is the displayed PID value as follows?<\/div>\n
\n
\n
\u2015 A\/F_SEN_CUR: 0.25 mA or more<\/span><\/div>\n
\u2015 HO2S_OUT_VOLT: 0.3 V or less<\/span><\/div>\n<\/dd>\n<\/dl>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 3.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
6<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY CONNECTOR CONNECTIONS<\/div>\n
\u2022 Access the following PIDs using the M-MDS: (See PID\/DATA MONITOR INSPECTION<\/a>.)<\/div>\n
\n
\n
\u2015 A\/F_SEN_CUR<\/div>\n
\u2015 HO2S_OUT_VOLT<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Does the PID value fluctuate when the following connectors are shaken?<\/div>\n
\n
\n
\u2015 A\/F sensor<\/div>\n
\u2015 HO2S<\/div>\n
\u2015 PCM<\/div>\n<\/dd>\n<\/dl>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Repair or replace the applicable wiring harness or connector parts.<\/div>\n
Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

Troubleshooting Diagnostic Procedure<\/p>\n

Intention of troubleshooting procedure<\/div>\n
\u2022 Step 1\u20142<\/div>\n
\n
\n
\u2015 Perform inspection of HO2S and A\/F sensor signal related parts.<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Step 3\u20147<\/div>\n
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\u2015 Perform inspection of each separate part.<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Repair completion verification<\/div>\n
\n
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\u2015 Verify that the primary malfunction is resolved and there are no other malfunctions.<\/div>\n<\/dd>\n<\/dl>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Step<\/p>\n<\/th>\n

\n

Inspection<\/p>\n<\/th>\n

\n

Results<\/p>\n<\/th>\n

\n

Action<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
1<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF HO2S IS INSTALLED CORRECTLY<\/div>\n
\u2022 Verify the HO2S installation condition. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.) (See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
\u2022 Is the installation condition normal?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Correctly install the HO2S and perform the repair completion verification.<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
2<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF A\/F SENSOR IS INSTALLED CORRECTLY<\/div>\n
\u2022 Verify the A\/F sensor installation condition. (See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.) (See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
\u2022 Is the installation condition normal?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Replace the A\/F sensor and\/or HO2S and perform the repair completion verification.<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Correctly install the A\/F sensor and perform the repair completion verification.<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
3<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF HO2S IS INSTALLED CORRECTLY<\/div>\n
\u2022 Verify the HO2S installation condition. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.) (See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
\u2022 Is the installation condition normal?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Correctly install the HO2S and perform the repair completion verification.<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
4<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF A\/F SENSOR IS INSTALLED CORRECTLY<\/div>\n
\u2022 Verify the A\/F sensor installation condition. (See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.) (See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
\u2022 Is the installation condition normal?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Correctly install the A\/F sensor and perform the repair completion verification.<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See AIR FUEL RATIO (A\/F) SENSOR REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
5<\/div>\n<\/td>\n
\n
PURPOSE: INSPECT EXHAUST SYSTEM FOR LEAKAGE<\/div>\n
\u2022 Visually inspect for exhaust gas leakage from the exhaust system.<\/div>\n
\u2022 Is there any malfunction?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Repair or replace the malfunctioning location and perform the repair completion verification.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
6<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF OTHER DTCs ARE DISPLAYED<\/div>\n
\u2022 Install\/connect the part removed\/disconnected during the troubleshooting procedure.<\/div>\n
\u2022 Clear the DTC recorded in the memory. (See CLEARING DTC<\/a>.)<\/div>\n
\u2022 Implement the repeatability verification procedure. (See Repeatability Verification Procedure<\/a>.)<\/div>\n
\u2022 Perform the DTC inspection for the PCM. (See DTC INSPECTION<\/a>.)<\/div>\n
\u2022 Are any other DTCs displayed?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Repair the malfunctioning location according to the applicable DTC troubleshooting.<\/div>\n
(See DTC TABLE [PCM (SKYACTIV-G (US))]<\/a>.)<\/div>\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
7<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY CATALYTIC CONVERTER (WU-TWC) MALFUNCTION<\/div>\n
\u2022 Clear the DTC recorded in the memory. (See CLEARING DTC<\/a>.)<\/div>\n
\u2022 Implement the repeatability verification procedure. (See Repeatability Verification Procedure<\/a>.)<\/div>\n
\u2022 Perform the DTC inspection for the PCM. (See DTC INSPECTION<\/a>.)<\/div>\n
\u2022 Is the same Pending DTC present?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Replace the exhaust manifold and perform the repair completion verification.<\/div>\n
(See EXHAUST SYSTEM REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n
(See EXHAUST SYSTEM REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
DTC troubleshooting completed.<\/div>\n<\/td>\n<\/tr>\n
\n
Repair completion verification 1<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY THAT VEHICLE IS REPAIRED<\/div>\n
\u2022 Install\/connect the part removed\/disconnected during the troubleshooting procedure.<\/div>\n
\u2022 Clear the DTC recorded in the memory. (See CLEARING DTC<\/a>.)<\/div>\n
\u2022 Replicate the vehicle conditions at the time the DTC was detected using the following procedure.<\/div>\n
\n
\n
\u2015 Implement the repeatability verification procedure. (See Repeatability Verification Procedure<\/a>.)<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Perform the DTC inspection for the PCM. (See DTC INSPECTION<\/a>.)<\/div>\n
\u2022 Is the same Pending DTC present?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.<\/div>\n
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)]<\/a>.)<\/div>\n
If the CAN communication is normal, perform the diagnosis from Step 1.<\/div>\n
\u2022 If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL\/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))]<\/a>.) (See PCM REMOVAL\/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/a>.)<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
Go to the next step.<\/div>\n<\/td>\n<\/tr>\n
\n
Repair completion verification 2<\/div>\n<\/td>\n
\n
PURPOSE: VERIFY IF OTHER DTCs DISPLAYED<\/div>\n
\u2022 Perform the DTC inspection. (See DTC INSPECTION<\/a>.)<\/div>\n
\u2022 Are any other DTCs displayed?<\/div>\n<\/td>\n
\n
Yes<\/div>\n<\/td>\n
\n
Repair the malfunctioning location according to the applicable DTC troubleshooting.<\/div>\n<\/td>\n<\/tr>\n
\n
No<\/div>\n<\/td>\n
\n
DTC troubleshooting completed.<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
<\/div>\n
<\/div>\n
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DTC P0421:00 [PCM (SKYACTIV-G (US))] SM2565565 id0102t47044u0 Note \u2022 To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”. Details On DTCs Description Catalytic converter system Detection condition Determination conditions \u2022 The PCM detects that the HO2S output fluctuates from lean to rich in a short amount of time at specified times continuously after recovery from fuel cut control. Preconditions \u2022 Catalytic converter (WU-TWC) is activated sufficiently. \u2022 A\/F sensor is […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-10010","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/10010","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/comments?post=10010"}],"version-history":[{"count":0,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/10010\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/media?parent=10010"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}