DTC P0134 [L8, LF]

id0102b1804900

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
- A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode
- Following conditions are met
• Time from engine start is 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 is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• A/F sensor deterioration
• A/F sensor heater malfunction
• Open circuit or short to ground in wiring harness between A/F sensor terminal A and PCM terminal 2AD

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING 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 pending and stored DTCs using the M-MDS.
• Is other DTC present?
Yes
Go to the appropriate DTC troubleshooting procedures.
No
Go to the next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0134 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
5
INSPECT INSTALLATION OF A/F SENSOR
• Inspect if the A/F sensor is loosely installed.
• Is the sensor installed securely?
Yes
Go to the next step.
No
Install sensor securely, then go to Step 10.
6
INSPECT A/F SENSOR HEATER
• Inspect the A/F sensor heater.
• Is the A/F sensor heater normal?
Yes
Go to the next step.
No
Replace the A/F sensor, then go to Step 10.
7
INSPECT A/F SENSOR
• Inspect the A/F sensor.
• Is there any malfunction?
Yes
Go to the next step.
No
Replace the A/F sensor, then go to Step 10.
8
INSPECT A/F SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY CIRCUIT
• Turn the ignition switch to OFF.
• Disconnect the A/F sensor connector.
• Measure the voltage between A/F sensor terminal A (wiring harness-side) and GND.
• Is the voltage above 3.22 V?
Yes
Repair or replace for short to power supply circuit, then go to Step 10.
No
Go to the next step.
9
INSPECT A/F SENSOR SIGNAL CIRCUIT FOR OPEN
• Disconnect the PCM connector.
• 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.
No
Repair or replace for open circuit, then go to the net step.
10
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 memory using the M-MDS.
• Perform the KOER self-test.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTC present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.