Nissan Teana J32. Manual — part 425
EC-238
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
P0603 ECM POWER SUPPLY
P0603 ECM POWER SUPPLY
Description
INFOID:0000000003856699
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 vol-
ume learning value memory, etc.
DTC Logic
INFOID:0000000003856700
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 1 second.
2.
Start engine and let it idle for 1 second.
3.
Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
4.
Repeat steps 2 and 3 for 4 times.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000003856701
1.
CHECK ECM POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
PBIA9222J
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
ECM power supply cir-
cuit
ECM back up RAM system does not function
properly.
• Harness or connectors
[ECM power supply (back up) circuit is
open or shorted.]
• ECM
ECM
Ground
Voltage
Connector
Terminal
F8
77
Ground
Battery voltage
P0603 ECM POWER SUPPLY
EC-239
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
DETECT MALFUNCTIONING PART
Check the following.
• 15A fuse (No.50)
• IPDM E/R harness connector F12
• Harness for open or short between ECM and battery
>> Repair or replace harness or connectors.
3.
CHECK INTERMITTENT INCIDENT
GI-35, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness or connectors.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC CONFIRMATION PROCEDURE.
See
.
Is the 1st trip DTC P0603 displayed again?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE ECM
1.
Replace ECM.
2.
Go to
EC-14, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
.
>> INSPECTION END
EC-240
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
P0605 ECM
P0605 ECM
Description
INFOID:0000000003856702
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
DTC Logic
INFOID:0000000003856703
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.
Turn ignition switch ON.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1.
Turn ignition switch ON and wait at least 1 second.
2.
Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C
1.
Turn ignition switch ON and wait at least 1 second.
2.
Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3.
Repeat step 2 for 32 times.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
PBIA9222J
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0605
Engine control module
A)
ECM calculation function is a malfunctioning.
• ECM
B)
ECM EEP-ROM system is a malfunctioning.
C)
ECM self shut-off function is a malfunctioning.
P0605 ECM
EC-241
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Diagnosis Procedure
INFOID:0000000003856704
1.
INSPECTION START
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC CONFIRMATION PROCEDURE.
See
.
Is the 1st trip DTC P0605 displayed again?
YES
>> GO TO 2.
NO
>> INSPECTION END
2.
REPLACE ECM
1.
Replace ECM.
2.
Go to
EC-14, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
.
>> INSPECTION END
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