DTC P0134[ZJ, ZY, Z6]
id0102c1804900
Without Throttle Valve Actuator
DTC P0134 |
Front HO2S circuit no activity detected |
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DETECTION CONDITION
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• The PCM monitors the input voltage from the front HO2S when the following conditions are met. If the input voltage from sensor never exceeds 0.55 V for 120 s or more, the PCM determines that sensor circuit is not activated.
MONITORING CONDITIONS
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.
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POSSIBLE CAUSE
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• Front HO2S deterioration
• Front HO2S heater malfunction
• Leakage in exhaust system
• Open circuit in wiring harness between front HO2S terminal A and PCM terminal 2AI
• Short to ground in wiring harness between front HO2S terminal A and PCM terminal 2AI
• Insufficient compression
• Engine malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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---|---|---|---|
1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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||
2
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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
• Turn the ignition switch off, then to the ON position (Engine off).
• Verify pending and stored DTCs using the M-MDS.
• Are other DTC present?
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Yes
|
Go to appropriate DTC troubleshooting procedures.
(See DTC TABLE[ZJ, ZY, Z6].)
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No
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Go to the next step.
|
||
4
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VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up the engine.
• Access O2S11 PID using the M-MDS.
• Verify PID while racing engine (in NEUTRAL (MTX) or PARK (ATX)).
• Is PID normal?
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Yes
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Go to step 7.
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No
|
Go to the next step.
|
||
5
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INSPECT INSTALLATION OF FRONT HO2S
• Inspect if the front HO2S is loosely installed.
• Is sensor installed securely?
|
Yes
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Go to the next step.
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No
|
Install sensor securely, then go to Step 9.
|
||
6
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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.
• If all items above are normal, replace the malfunctioning sensor.
Then go to Step 9.
|
||
7
|
INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Remove the radiator cap.
• Implement procedure to bleed air from engine coolant, then idle the engine.
• Is there any small bubble, which makes engine coolant white at filling opening?
|
Yes
|
Air gets in from poor sealing on head gasket or other areas between combustion chamber and engine coolant passage.
Repair or replace the malfunctioning part, then go to Step 9.
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No
|
Go to the next step.
|
||
8
|
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is it normal?
|
Yes
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Go to the next step.
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No
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Perform engine overhaul for repairs, then go to the next step.
|
||
9
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VERIFY TROUBLESHOOTING OF DTC P0134 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the “HO2S heater, HO2S, and TWC Repair Verification Drive Mode”.
(See OBD DRIVE MODE[ZJ, ZY, Z6].)
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
|
Go to the next step.
|
||
10
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC inspection.
(See DTC TABLE[ZJ, ZY, Z6].)
|
No
|
DTC troubleshooting completed.
|
With Throttle Valve Actuator
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 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
• 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 appropriate DTC troubleshooting procedures.
(See DTC TABLE[ZJ, ZY, Z6].)
|
No
|
Go to the next step.
|
||
4
|
VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up the engine.
• Access O2S11 PID using the M-MDS.
• Verify PID while racing engine (in NEUTRAL (MTX) or PARK (ATX)).
• Is PID normal?
|
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.
• 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 M-MDS.
• 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.
(See DTC TABLE[ZJ, ZY, Z6].)
|
No
|
DTC troubleshooting completed.
|