DTC P0134:00 [PCM (SKYACTIV-X)]

Description	A/F sensor circuit no activity detected
Detection condition	Determination conditions	• The condition in which the A/F sensor element impedance is the specified value or more continues for 35 s.
	Preconditions	• Battery voltage: 11—18 V^1 • The following DTCs are not detected: ― A/F sensor heater: P0031:00 and P0032:00 ― A/F sensor: P0131:00 and P0132:00 ^1: Standard can be verified by displaying PIDs using M-MDS
	Malfunction determination period	• 35 s period
	Drive cycle	• 2
	Self test type	• CMDTC self test
	Sensor used	• A/F sensor
Fail-safe function	• Fixes duty value of A/F sensor heater • Stops fuel feedback control of A/F sensor
Vehicle status when DTCs are output	• Not applicable
Possible cause	• A/F sensor malfunction ― A/F sensor connector or terminals malfunction ― A/F sensor related wiring harness malfunction ― A/F sensor incorrect installation ― A/F sensor deterioration • PCM connector or terminals malfunction • PCM malfunction

• The PCM performs verification as to whether a condition in which A/F (air/fuel ratio) detection is not implemented due to poor A/F sensor activation by a decrease in A/F sensor performance or other malfunction has occurred. A DTC is stored if the A/F sensor cannot implement feedback (non-active condition (resistance value is specified value or more)) for a continuous 35 s or more under the condition in which the A/F sensor heater control has been normally implemented. However, under a condition prior to the A/F sensor performing activation (such as ignition switched off), and if there is an open/short circuit (P2251:00) between the A/F sensor terminal D and PCM terminal 1S (COM terminal), or an open/short circuit (P2243:00) between A/F sensor terminal F and PCM terminal 1T (B+ terminal), A/F sensor activation determination is not performed and A/F sensor non-activation (P0134:00) is determined. In addition, if a temporary malfunction is determined in the previous drive cycle because poor A/F sensor activation was determined at the second drive cycle, DTCs are established for each malfunction determination even if the PCM determined a COM open circuit (P2251:00 temporary malfunction) or a B+ open circuit (P2243:00 temporary malfunction) in the previous drive cycle.

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1. Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.

2. Start the engine and leave it idling for 1 min.

Note

• 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.

3. Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the freeze frame data/snapshot data.

PIDs	Reference
A/F_SEN_CUR	(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].)

Step	Inspection	Results	Action
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is the DTC P0134:00 on freeze frame data?	Yes	Go to the next step.
2		No	Go to the troubleshooting procedure for DTC on freeze frame data. (See DTC TABLE [PCM (SKYACTIV-X)].)
3	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
4	PURPOSE: INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
4		No	Go to the next step.
5	PURPOSE: PERFORM DTC INSPECTION RELATED TO A/F SENSOR OPEN CIRCUIT • Perform the DTC P2243:00 and DTC P2251:00 procedure. (See DTC P2243:00 [PCM (SKYACTIV-X)].) (See DTC P2251:00 [PCM (SKYACTIV-X)].)	—	Go to the next step.
6	PURPOSE: VERIFY A/F SENSOR INPUT SIGNAL • Start the engine and warm it up completely. • Access the A/F_SEN_CUR PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Drive the vehicle under the following conditions. Warning • 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. • While performing this step, always operate the vehicle in a safe and lawful manner. ― After increasing the engine speed to 3,000 rpm, decelerate using engine braking. • Is the displayed PID value as follows? ― A/F_SEN_CUR: 0.25 mA or more	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
6		No	Go to the next step.
7	PURPOSE: INSPECT RELATED SENSOR WIRING HARNESS AND CONNECTOR • Access the A/F_SEN_CUR PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Does the PID value fluctuate when the following connectors are shaken? ― A/F sensor ― PCM	Yes	Inspect the related wiring harness and connector. • Repair or replace the malfunctioning part. Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
7		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

• Repair completion verification

Step	Inspection	Results	Action
1	PURPOSE: VERIFY IF A/F SENSOR IS INSTALLED CORRECTLY • Verify the A/F sensor installation condition. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) • Is the installation condition normal?	Yes	Replace the A/F sensor and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
1		No	Correctly install the A/F sensor and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
2	PURPOSE: VERIFY IF A/F SENSOR IS INSTALLED CORRECTLY • Verify the A/F sensor installation condition. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) • Is the installation condition normal?	Yes	Go to the next step.
2		No	Correctly install the A/F sensor and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
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. ― Implement the repeatability verification procedure. (See Repeatability Verification 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 CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) 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. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1		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 the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.

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