Infiniti M45 (Y34). Manual — part 370
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-169
C
D
E
F
G
H
I
J
K
L
M
A
EC
BANK 2
TBWA0270E
EC-170
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
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.
Diagnostic Procedure
ABS002EX
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
11
G
Heated oxygen sensor 2
heater (bank 2)
[Engine is running]
●
Engine speed is below 3,600 rpm 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 - 1.0V
[Ignition switch: ON]
●
Engine stopped
[Engine is running]
●
Engine speed: Above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
PBIB1118E
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-171
C
D
E
F
G
H
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J
K
L
M
A
EC
2.
CHECK HO2S2 POWER SUPPLY CIRCUIT
1.
Disconnect heated oxygen sensor 2 harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between HO2S2 terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors B5, M5
●
Harness connectors M15, E205
●
Harness connectors E35, E305
●
Fuse block (J/B) No.1 connector B1
●
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.
Voltage: Battery voltage
PBIB0018E
PBIB0112E
EC-172
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
4.
CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E315, F5
●
Harness for open or short between heated oxygen sensor 2 and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to
EC-173, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning heated oxygen sensor 2.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
DTC
Terminals
Bank
ECM
Sensor
P0037, P0038
10
2
1
P0057, P0058
11
2
2
Continuity should exist.
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