DTC P0134 [ZY]

id0102d3804900

DTC P0134

Front HO2S circuit no activity detected

DETECTION CONDITION

• If the front HO2S impedance is 220 ohms or more even though 40 s or more has elapsed since the engine was started.
Diagnostic support note
• This is a continuous monitor (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

• Front HO2S deterioration
• Front HO2S heater malfunction
• Open circuit in wiring harness between front HO2S terminal A and PCM terminal 2Z
• Short to ground in wiring harness between front HO2S terminal A and PCM terminal 2Z

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has 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 REPAIR INFORMATION AVAILABILITY
• Verify related service 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.
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 WDS or equivalent.
• Is other DTC present?
Yes
Go to appropriate DTC troubleshooting procedures.
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up the engine.
• Access O2S11 PID using the WDS or equivalent.
• Verify PID while racing engine (in NEUTRAL (MTX) or PARK (ATX)).
• Is PID normal?

- Less than 1 mA when suddenly depressing the accelerator pedal (rich condition)

- More than 1 mA just after releasing the accelerator pedal (lean condition)

Yes
Go to step 7.
No
Go to the next step.
5
INSPECT INSTALLATION OF FRONT HO2S
• Inspect if the front HO2S is loosely installed.
• Is sensor installed securely?
Yes
Go to the next step.
No
Install sensor securely, then go to Step 9.
6
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
• Visually inspect if there is any gas leakage between the exhaust manifold and the front HO2S.
• Is there gas leakage?
Yes
Repair or replace any malfunctioning exhaust part, then go to Step 9.
No
• Inspect the following wiring harnesses for open circuit or short to ground in wiring harness.
- Front HO2S terminal A (wiring harness-side) to PCM terminal 2Z (wiring harness-side)
• Repair or replace wiring harness if necessary.
• If all items above are normal, replace the malfunctioning sensor.
Then go to Step 9.
7
INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Perform the ENGINE COOLANT LEAKAGE INSPECTION.
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to inspection results, then go to Step 9.
No
Go to the next step.
8
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is it normal?
Yes
Go to the next step.
No
Perform engine overhaul for repairs, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0134 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the "KOER self-test".
• Is the DTC P0134 present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.