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Infiniti FX35 / FX45. Manual - part 497

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-749

< SERVICE INFORMATION >

[VK45DE]

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

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)

W/R

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
- After 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

B/R

Sensor ground
(Heated oxygen sensor 2)

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

Approximately 0V

EC-750

< SERVICE INFORMATION >

[VK45DE]

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.

TBWM1326E

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-751

< SERVICE INFORMATION >

[VK45DE]

Diagnosis Procedure

INFOID:0000000001326575

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten three ground screws on the body.
Refer to

EC-723, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK HO2S2 POWER SUPPLY CIRCUIT

Disconnect heated oxygen sensor 2 harness connector.

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Heated oxygen sensor 2
heater (Bank 2)

[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)

LG/B

Heated oxygen sensor 2
(Bank 2)

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

ly after the following conditions are met

- Engine: After warming up
- After 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

B/R

Sensor ground
(Heated oxygen sensor 2)

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

Approximately 0V

PBIB2195E

PBIB1534E

EC-752

< SERVICE INFORMATION >

[VK45DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Turn ignition switch ON.

Check voltage between HO2S2 terminal 2 and ground with
CONSULT-III or tester.

OK or NG

>> GO TO 4.

>> GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E19, F49
• IPDM E/R connector E7
• 10A fuse
• Harness for open or short between heated oxygen sensor 2 and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 5.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HEATED OXYGEN SENSOR 2 HEATER

Refer to

EC-752, "Component Inspection"