DTC P0037:00 [MZR 2.0 DISI]

id0102f5700600

DTC P0037:00

HO2S heater control circuit low input
DETECTION CONDITION
•  The PCM monitors the HO2S heater output voltage. If the PCM turns the HO2S heater on or off but the HO2S heater circuit voltage remains low, the PCM determines that the HO2S heater circuit has a malfunction.
Diagnostic support note
•  This is a continuous monitor (A/F sensor heater, HO2S heater).
•  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
•  HO2S connector or terminals malfunction
•  Short to ground or open circuit in HO2S heater power supply circuit
―  Short to ground in wiring harness between BCM terminal 2G and HO2S terminal C
―  Open circuit in wiring harness between BCM terminal 2G and HO2S terminal C
•  HO2S heater malfunction
•  Short to ground in wiring harness between HO2S terminal D and PCM terminal 2D
•  PCM connector or terminals malfunction
•  Open circuit in wiring harness between HO2S terminal D and PCM terminal 2D
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
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 heater, HO2S heater 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.
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
INSPECT HO2S CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the HO2S 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 9.
No
Go to the next step.
4
INSPECT HO2S HEATER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
•  HO2S connector is disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the HO2S terminal C (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible short to ground or open circuit, then go to Step 9.
5
INSPECT HO2S HEATER
•  Switch the ignition to off.
•  Inspect the HO2S heater.
•  Is there any malfunction?
Yes
Replace the HO2S, then go to Step 9.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 2.0 DISI].)
No
Go to the next step.
6
INSPECT HO2S HEATER CONTROL CIRCUIT FOR SHORT TO GROUND
•  HO2S connector is disconnected.
•  Inspect for continuity between HO2S terminal D (wiring harness-side) and body ground.
•  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 9.
No
Go to the next step.
7
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 9.
No
Go to the next step.
8
INSPECT HO2S HEATER CONTROL CIRCUIT FOR OPEN CIRCUIT
•  HO2S and PCM connecters are disconnected.
•  Inspect for continuity between HO2S terminal D (wiring harness-side) and PCM terminal 2D (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOEO or KOER self test.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI].)
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 [MZR 2.0 DISI].)
No
DTC troubleshooting completed.