Infiniti FX35 / FX45. Manual — part 350

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-161

< SERVICE INFORMATION >

[VQ35DE]

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Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
1.

Start engine and warm it up to the normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start the engine and keep the engine speed between 3,500 rpm and 4,000 rpm for at least 1 minute under
no load.

4.

Let engine idle for 1 minute.

5.

Check 1st trip DTC.

6.

If 1st trip DTC is detected, go to

EC-165, "Diagnosis Procedure"

.

EC-162

< SERVICE INFORMATION >

[VQ35DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Wiring Diagram

INFOID:0000000001325977

BANK 1

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1590E

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-163

< SERVICE INFORMATION >

[VQ35DE]

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WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

25

P

Heated oxygen sensor 2
heater (bank 1)

[Engine is running]
• Engine speed: Below 3,600 rpm after the fol-

lowing conditions are met

- Engine: After warming up
- Keeping the engine speed between 3,500

and 4,000 rpm for 1 minute and at idle for 1
minute under no load

0 - 1.0V

[Ignition switch: ON]
• Engine stopped
[Engine is running]
• Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

74

LG/B

Heated oxygen sensor 2
(bank 1)

[Engine is running]
• Revving engine from idle to 3,000 rpm quick-

ly after the following conditions are met

- Engine: After warming up.
- Keeping the engine speed between 3,500

and 4,000 rpm for 1 minute and at idle for 1
minute under no load

0 - Approximately 1.0V

78

B/R

Sensor ground
(Heated oxygen sensor)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

EC-164

< SERVICE INFORMATION >

[VQ35DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

BANK 2

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1591E