Nissan Maxima. Manual — part 476
EC-388
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0550 PSP SENSOR
3. Check the voltage between ECM terminals under the following
conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace power steering pressure sensor. Refer to
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
F13
41
(Power steering
pressure sensor
signal)
48
(Sensor
ground)
Steering wheel: Being
turned.
0.5 - 4.5 V
Steering wheel: Not
being turned.
0.4 - 0.8 V
JMBIA1873ZZ
P0603 ECM POWER SUPPLY
EC-389
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0603 ECM POWER SUPPLY
Description
INFOID:0000000010095069
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:0000000010095070
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 second.
2. Turn ignition switch OFF and wait at least 5 minutes.
3. Turn ignition switch ON, wait at least 10 seconds.
4. Repeat steps 2 and 3 for five times.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010095071
Regarding Wiring Diagram information, refer to
.
1.
CHECK ECM POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
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
EC-390
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0603 ECM POWER SUPPLY
3. Check the voltage between ECM harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• 15 A fuse (No. 42)
• IPDM E/R harness connector F10
• Harness for open or short between ECM and battery
>> Repair or replace harness or connectors.
3.
CHECK INTERMITTENT INCIDENT
GI-41, "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.
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-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
>> INSPECTION END
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
F13
77
E10
112
Battery voltage
JMBIA1889ZZ
P0605 ECM
EC-391
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0605 ECM
Description
INFOID:0000000010095072
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:0000000010095073
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> 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?
PBIA9222J
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0605
Engine control module
A)
ECM calculation function is malfunctioning.
• ECM
B)
ECM EEP-ROM system is malfunctioning.
C)
ECM self shut-off function is malfunctioning.
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