DTC P0134:00

DTC P0134.-00	A/F sensor circuit no activity detected
DETECTION CONDITION	The PCM monitors the element impedance A/F sensor when the following conditions are met. Under the following monitoring conditions, the element impedance more than specified value, the PCM determines that the A/F sensor is not activated. MONITORING CONDITIONS Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode) Following conditions are met: A/F sensor heater is turned on for 35 s or more Battery voltage: 11-18 V Diagnostic support note This is an intermittent monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor loose Exhaust system leakage A/F sensor connector or terminals malfunction A/F sensor heater malfunction Short to ground in wiring harness between the following terminals: A/F sensor terminal E-PCM terminal 2A A/F sensor terminal B-PCM terminal 2AD A/F sensor terminal D-PCM terminal 2AC A/F sensor terminal F-PCM terminal 2Z PCM connector or terminals malfunction Open circuit in wiring harness between the following terminals: A/F sensor terminal E-PCM terminal 2A A/F sensor terminal B-PCM terminal 2AD A/F sensor terminal D-PCM terminal 2AC A/F sensor terminal F-PCM terminal 2Z Engine malfunction Insufficient engine compression Engine coolant leakage A/F sensor malfunction PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the DTC P0134:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
1		No	Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE ).
2	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?	Yes	Go to the next step.
2		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3	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.
3		No	Go to the next step.
4	VERIFY RELATED PENDING CODE AND STORED DTC NOTE: If fuel monitor DTC, DTC P0132:00 is retrieved, ignore it until P0134:00 is fixed. Switch the ignition to off, then to ON (engine off). Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the DTC P2237:00 or P2251:00 also present?	Yes	Go to the applicable DTC inspection. (See DTC P2237:00 ). (See DTC P2251:00 ).
4		No	Go to the next step.
5	INSPECT INSTALLATION OF A/F SENSOR Inspect installation of A/F sensor. Is the A/F sensor installed securely?	Yes	Go to the next step.
5		No	Retighten the A/F sensor, then go to Step 15. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ).
6	INSPECT FOR LEAKAGE FROM EXHAUST SYSTEM Visually inspect if there is any exhaust gas leakage between the exhaust manifold and A/F sensor. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
6		No	Go to the next step.
7	INSPECT A/F SENSOR CONNECTOR CONDITION Switch the ignition to off. Disconnect the A/F sensor 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 15.
7		No	Go to the next step.
8	INSPECT A/F SENSOR HEATER Inspect the A/F sensor heater. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 15. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	INSPECT A/F SENSOR CIRCUIT FOR SHORT TO GROUND A/F sensor connector is disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: A/F sensor terminal E A/F sensor terminal B A/F sensor terminal D A/F sensor terminal F Is there continuity?	Yes	If the short to ground circuit could be detected: Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION ). Go to Step 15.
9		No	Go to the next step.
10	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 15.
10		No	Go to the next step.
11	INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT A/F sensor and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): A/F sensor terminal E-PCM terminal 2A A/F sensor terminal B-PCM terminal 2AD A/F sensor terminal D-PCM terminal 2AC A/F sensor terminal F-PCM terminal 2Z Is there continuity?	Yes	Go to the next step.
11		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
12	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION ). Is there any malfunction?	Yes	Repair or replace the malfunctioning parts according to the inspection results, then go to Step 15.
12		No	Go to the next step.
13	INSPECT SEALING OF ENGINE COOLANT PASSAGE Perform the "ENGINE COOLANT LEAKAGE INSPECTION". (See ENGINE COOLANT LEAKAGE INSPECTION ). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
13		No	Go to the next step.
14	INSPECT A/F SENSOR Reconnect all disconnected connectors. Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the A/F sensor, then go to the next step. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ).
14		No	Go to the next step.
15	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). Start the engine and warm it up completely. Perform the Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode). (See OBD-II DRIVE MODE ). Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION ). Go to the next step.
15		No	Go to the next step.
16	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
16		No	DTC troubleshooting completed.