DTC P0134

DTC P0134	A/F sensor no activity detected
DETECTION CONDITION	The PCM monitors the A/F sensor element impedance when the following conditions are met. If the A/F sensor element impedance is 80 ohms or more, the PCM determines that A/F sensor is not activated. MONITORING CONDITIONS PCM Adaptive Memory Production, EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S, and TWC Repair Verification Drive Mode Following conditions are met: Time from engine start: above 30 s (ECT when engine start is 20°C {68°F}) 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 the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor looseness A/F sensor connector or terminals malfunction A/F sensor heater malfunction PCM connector or terminals malfunction Short to power supply in wiring harness between A/F sensor terminal A and PCM terminal 2AD Open circuit in wiring harness between A/F sensor terminal A and PCM terminal 2AD A/F sensor deterioration PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE BULLETINS AVAILABILITY Verify related Service Bulletins availability. Is any related Service Bulletins available?	Yes	Perform the repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND STORED DTC NOTE: If fuel monitor DTC, DTC P0132 is retrieved, ignore it until P0134 is fixed. Turn the ignition switch off, then to the ON position (Engine off). Verify related PENDING CODE and stored DTC. Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) Is the DTC P0134 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
4		No	Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE ).
5	INSPECT INSTALLATION OF A/F SENSOR Turn the ignition switch off. Inspect if the A/F sensor is loosely installed. Is the A/F sensor installed securely?	Yes	Go to the next step.
5		No	Retighten the A/F sensor, then go to Step 12.
6	INSPECT A/F SENSOR CONNECTOR AND TERMINALS 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 connector or terminals, then go to Step 12.
6		No	Go to the next step.
7	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 12. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ).
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR AND TERMINALS Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 12.
8		No	Go to the next step.
9	INSPECT A/F SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY A/F sensor and PCM connectors are disconnected. Turn the ignition switch to the ON position (Engine off). Measure the voltage between A/F sensor terminal A (wiring harness-side) and body ground. Is the voltage above 3.22 V?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 12.
9		No	Go to the next step.
10	INSPECT A/F SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT A/F sensor and PCM connectors are disconnected. Turn the ignition switch off. Inspect for continuity between PCM terminal 2AD (wiring harness-side) and A/F sensor terminal A (wiring harness-side). Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 12.
11	INSPECT A/F SENSOR Reconnect A/F sensor and PCM 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 ).
11		No	Go to the next step.
12	VERIFY TROUBLESHOOTING OF DTC P0134 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position (Engine off). Clear the DTC from the PCM memory using the M-MDS. Perform the KOER self test (using M-MDS) or Drive Mode 03 (PCM Adaptive Memory Production, EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S, and TWC Repair Verification Drive Mode) (not using M-MDS). (See KOEO/KOER SELF TEST ). (See OBD-II DRIVE MODE ). Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
12		No	Go to the next step.
13	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 ).
13		No	DTC troubleshooting completed.