Infiniti I35 (A33). Manual — part 289
BANK 2
NHEC1167S02
MEC542D
SEC662DC
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1146, P1166 HO2S2
Wiring Diagram (Cont’d)
EC-497
Diagnostic Procedure
NHEC1168
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.
2
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3. Clear the self-learning control coefficient by touching “CLEAR”.
SEF968Y
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness connector.
5. Make sure DTC P0102 is displayed.
6. Erase the DTC memory. Refer to “HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”, EC-88.
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?
Yes or No
Yes
©
Perform trouble diagnosis for DTC P0172, P0175. Refer to EC-281.
No
©
GO TO 3.
DTC P1146, P1166 HO2S2
Diagnostic Procedure
EC-498
3
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect corresponding heated oxygen sensor 2 harness connector.
SEC134D
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.
MTBL1161
Continuity should exist.
5. Check harness continuity between ECM terminal or HO2S2 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL1162
Continuity should not exist.
6. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
4
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between HO2S2 terminal 4 and ground.
Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to power.
OK or NG
OK (With CONSULT-II)
©
GO TO 6.
OK (Without CONSULT-
II)
©
GO TO 7.
NG
©
GO TO 5.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1146, P1166 HO2S2
Diagnostic Procedure (Cont’d)
EC-499
5
DETECT MALFUNCTIONING PART
Check the following.
I
Joint connectors-18
I
Harness for open or short between heated oxygen sensor 2 and ground
©
Repair open circuit or short to power in harness or connectors.
6
CHECK HEATED OXYGEN SENSOR 2
With CONSULT-II
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 engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item with CONSULT-
II.
6. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
±
25%.
SEF066YA
“HO2S2 (B1)/(B2)” should be above 0.63V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)/(B2)” should be below 0.48V at least once when the “FUEL INJECTION” is −25%.
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 9.
NG
©
Replace malfunctioning heated oxygen sensor 2.
DTC P1146, P1166 HO2S2
Diagnostic Procedure (Cont’d)
EC-500
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