Infiniti I30 (A33). Manual — part 236
Wiring Diagram
=NHEC0144
BANK 1
NHEC0144S01
MEC412D
SEF657XD
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Wiring Diagram
EC-259
BANK 2
NHEC0144S02
MEC413D
SEF658XD
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Wiring Diagram (Cont’d)
EC-260
Diagnostic Procedure
NHEC0145
1
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF255X
©
GO TO 2.
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 “START”.
SEF215Z
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 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 1st trip DTC P0100 is displayed.
6. Erase the 1st trip DTC memory. Refer to “HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”,
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
©
Perform trouble diagnosis for DTC P0171, P0174. Refer to EC-292.
No
©
GO TO 3.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Diagnostic Procedure
EC-261
3
CHECK HO2S2 (REAR) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 2 (rear) harness protector color.
SEC021C
3. Disconnect corresponding heated oxygen sensor 2 (rear) harness connector.
SEF467WB
4. Disconnect ECM harness connector.
5. Check harness continuity between ECM terminal and HO2S2 (rear) terminal as follows.
Refer to Wiring Diagram.
MTBL0602
Continuity should exist.
6. Check harness continuity between ECM terminal or HO2S2 (rear) terminal and ground as follows.
Refer to Wiring Diagram.
MTBL0603
Continuity should not exist.
7. 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.
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Diagnostic Procedure (Cont’d)
EC-262
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