Infiniti I35 (A33). Manual — part 209
BANK 2
NHEC0831S02
MEC540D
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Wiring Diagram (Cont’d)
EC-177
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
39
OR/L
Heated oxygen sensor
1 heater (bank 1)
[Engine is running]
I
Warm-up condition
I
Engine speed is below 3,600 rpm.
Approximately 7V
★
PBIB0519E
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
40
R/L
Heated oxygen sensor
1 heater (bank 2)
[Engine is running]
I
Warm-up condition
I
Engine speed is below 3,600 rpm.
Approximately 7V
★
PBIB0519E
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
★
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
NHEC0832
1
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws.
Refer to “Ground Inspection”, EC-160.
SEC047D
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace ground connections.
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Wiring Diagram (Cont’d)
EC-178
2
CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect corresponding heated oxygen sensor 1 harness connector.
SEC099D
SEC134D
2. Turn ignition switch ON.
3. Check voltage between HO2S1 terminal 2 and ground with CONSULT-II or tester.
SEF311X
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M229, F66
I
Fuse block (J/B) connector M19
I
15A fuse
I
Harness for open or short between heated oxygen sensor 1 and fuse
©
Repair harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure (Cont’d)
EC-179
4
CHECK HO2S1 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 HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL1140
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK HEATED OXYGEN SENSOR 1 HEATER
Check resistance between HO2S1 terminals as follows.
SEF310XB
CAUTION:
I
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
I
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
OK or NG
OK
©
GO TO 6.
NG
©
Replace malfunctioning heated oxygen sensor.
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure (Cont’d)
EC-180
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