Infiniti I35 (A33). Manual — part 276
Wiring Diagram
NHEC1261
MEC572D
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0650 MIL (CIRCUIT)
Wiring Diagram
EC-445
Specification data are reference values and are measured between each terminal and body 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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
33
LG/B
MIL
[Ignition switch ON]
0 - 1.0V
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
Diagnostic Procedure
NHEC1262
1
CHECK MIL POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Turn ignition switch ON.
4. Check voltage between combination meter terminal 66 and ground with CONSULT-II or tester.
SEC006E
Voltage: Battery voltage
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Fuse block (J/B) connector M19
I
10A fuse
I
Harness for open or short between fuse block (J/B) and combination meter
©
Repair harness or connectors.
3
CHECK MIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 33 and combination meter terminal 45.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
DTC P0650 MIL (CIRCUIT)
Wiring Diagram (Cont’d)
EC-446
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M229, F66
I
Harness for open or short between ECM and combination meter
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
OK or NG
OK
©
Replace combination meter. Refer to EL-125, “METERS AND GAUGES”.
NG
©
Repair or replace.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0650 MIL (CIRCUIT)
Diagnostic Procedure (Cont’d)
EC-447
SEF093X
Component Description
NHEC1263
Battery voltage is supplied to the ECM even when the ignition
switch is turned OFF for the ECM memory function of the DTC
memory, the air fuel ratio feedback compensation value memory,
the idle air volume learning value memory, etc.
On Board Diagnosis Logic
NHEC1264
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1065
1065
ECM power supply cir-
cuit
ECM back-up RAM system does not function
properly.
I
Harness or connectors
[ECM power supply (back-up) circuit
is open or shorted.]
I
ECM
DTC Confirmation Procedure
NHEC1265
NOTE:
If DTC Confirmation Procedure has been previously conducted,
always turn ignition switch OFF and wait at least 10 seconds before
conducting the next test.
SEF058Y
With CONSULT-II
1.
Turn ignition switch ON and wait at least 1 second.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 1 second.
4.
Turn ignition switch OFF, wait at least 10 seconds, and then
turn ON.
5.
Repeat steps 3 and 4 four times.
6.
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-450.
With GST
Follow the procedure “WITH CONSULT-II” above.
DTC P1065 ECM POWER SUPPLY (BACK UP)
Component Description
EC-448
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