DTC P0134:00 [MZR 1.8, MZR 2.0, MZR 2.5]

id0102f4702500

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 (A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode)
―  The following conditions are met:
•  A/F sensor heater is turned on for above 35 s. (MZR 2.5)
•  A/F sensor heater is turned on for above 30 s. (EXCEPT MZR 2.5)
•  Battery voltage: 10—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 looseness
•  Leakage exhaust system
•  A/F sensor connector or terminals malfunction
•  A/F sensor heater malfunction
•  Short to ground in wiring harness between the following terminals:
―  MZR 2.5:
•  A/F sensor terminal 1C—PCM terminal 2Z
•  A/F sensor terminal 1B—PCM terminal 2AC
•  A/F sensor terminal 1A—PCM terminal 2AD
•  A/F sensor terminal 2D—PCM terminal 2A
―  EXCEPT MZR 2.5:
•  A/F sensor terminal F—PCM terminal 2Z
•  A/F sensor terminal D—PCM terminal 2AC
•  A/F sensor terminal B—PCM terminal 2AD
•  A/F sensor terminal E—PCM terminal 2A
•  PCM connector or terminals malfunction
•  Open circuit in wiring harness between the following terminals:
―  MZR 2.5:
•  A/F sensor terminal 1C—PCM terminal 2Z
•  A/F sensor terminal 1B—PCM terminal 2AC
•  A/F sensor terminal 1A—PCM terminal 2AD
•  A/F sensor terminal 2D—PCM terminal 2A
―  EXCEPT MZR 2.5:
•  A/F sensor terminal F—PCM terminal 2Z
•  A/F sensor terminal D—PCM terminal 2AC
•  A/F sensor terminal B—PCM terminal 2AD
•  A/F sensor terminal E—PCM terminal 2A
•  Engine malfunction
―  Engine coolant leakage to combustion chamber
―  Insufficient engine compression
•  A/F sensor malfunction
―  A/F sensor deterioration
•  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.
•  Is the DTC P0134:00 on FREEZE FRAME DATA (Mode 2)?
Yes
Go to the next step.
No
Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].)
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.
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 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.
4
VERIFY RELATED PENDING CODE AND/OR DTC
Note
•  If the fuel monitor, DTC P0132:00 is retrieved, ignore it until DTC P0134:00 is fixed.
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the PENDING CODE/DTC P2237:00 or P2251:00 also present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC P2237:00 [MZR 1.8, MZR 2.0, MZR 2.5].)
(See DTC P2251:00 [MZR 1.8, MZR 2.0, MZR 2.5].)
No
Go to the next step.
5
INSPECT INSTALLATION OF A/F SENSOR
•  Inspect if the A/F sensor is loosely installed.
•  Is the A/F sensor installed securely?
Yes
Go to the next step.
No
Retighten the A/F sensor, then go to Step 15.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
6
INSPECT EXHAUST SYSTEM FOR GAS LEAKAGE
•  Visually inspect for the exhaust gas leakage between 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.
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 connector and/or terminals, then go to Step 15.
No
Go to the next step.
8
INSPECT A/F SENSOR HEATER
•  Inspect the A/F sensor heater.
•  Is there any malfunction?
Yes
Replace the A/F sensor, then go to Step 15.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
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:
―  MZR 2.5:
•  A/F sensor terminal 1C
•  A/F sensor terminal 1B
•  A/F sensor terminal 1A
•  A/F sensor terminal 2D
―  EXCEPT MZR 2.5:
•  A/F sensor terminal F
•  A/F sensor terminal D
•  A/F sensor terminal B
•  A/F sensor terminal E
•  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 the PCM internal circuit).
Go to Step 15.
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 connector and/or terminals, then go to Step 15.
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):
―  MZR 2.5:
•  A/F sensor terminal 1C—PCM terminal 2Z
•  A/F sensor terminal 1B—PCM terminal 2AC
•  A/F sensor terminal 1A—PCM terminal 2AD
•  A/F sensor terminal 2D—PCM terminal 2A
―  EXCEPT MZR 2.5:
•  A/F sensor terminal F—PCM terminal 2Z
•  A/F sensor terminal D—PCM terminal 2AC
•  A/F sensor terminal B—PCM terminal 2AD
•  A/F sensor terminal E—PCM terminal 2A
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
12
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 the inspection results, then go to Step 15.
No
Go to the next step.
13
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
No
Go to the next step.
14
INSPECT A/F SENSOR
•  Switch the ignition to off.
•  Reconnect all disconnected connectors.
•  Inspect the A/F sensor.
•  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 [MZR 1.8, MZR 2.0, MZR 2.5].)
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.
•  Perform the Drive Mode 01 (PCM Adaptive Memory Produce Drive Mode) and the Drive Mode 03 (A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode).
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
No
Go to the next step.
16
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].)
No
DTC troubleshooting completed.