Nissan Maxima. Instruction — part 504
EC-500
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
FUEL PUMP
4. Check the voltage between ECM harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check the voltage between IPDM E/R harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 8.
3.
DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F10
• Harness for open or short between IPDM E/R and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check harness continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel
pump” harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
>> Repair open circuit or short to power in harness or connectors.
6.
CHECK FUEL PUMP GROUND CIRCUIT
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
F14
14
E10
112
Battery voltage
JMBIA1890ZZ
IPDM E/R
Ground
Voltage
Connector
Terminal
F10
77
Ground
Battery voltage
JMBIA1885ZZ
IPDM E/R
Fuel level sensor unit and fuel
pump
Continuity
Connector
Terminal
Connector
Terminal
E18
13
B42
1
Existed
FUEL PUMP
EC-501
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair open circuit or short to power in harness or connector.
7.
CHECK FUEL PUMP
EC-501, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace fuel pump. Refer to
FL-6, "Removal and Installation"
8.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-35, "Removal and Installation"
.
NO
>> Repair or replace harness or connectors.
Component Inspection
INFOID:0000000010095220
1.
CHECK FUEL PUMP
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Check resistance between “fuel level sensor unit and fuel pump”
terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace “fuel level sensor unit and fuel pump” Refer to
FL-6, "Removal and Installation"
.
Fuel level sensor unit and fuel
pump
Ground
Continuity
Connector
Terminal
B42
3
Ground
Existed
Terminals
Resistance
1 and 3
0.2 - 5.0
Ω [at 25°C (77°F)]
SEC918C
EC-502
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
IGNITION SIGNAL
IGNITION SIGNAL
Description
INFOID:0000000010095221
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.
Component Function Check
INFOID:0000000010095222
Regarding Wiring Diagram information, refer to
.
1.
INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engine start?
YES-1 >> With CONSULT: GO TO 2.
YES-2 >> Without CONSULT: GO TO 3.
NO
>> Go to
2.
CHECK IGNITION SIGNAL FUNCTION
With CONSULT
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
2. Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
3.
CHECK IGNITION SIGNAL FUNCTION
Without CONSULT
1. Let engine idle.
2. Read the voltage signal between ECM harness connectors.
NOTE:
The pulse cycle changes depending on rpm at idle.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000010095223
Regarding Wiring Diagram information, refer to
.
1.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn it ON.
ECM
Voltage signal
+
–
Connec-
tor
Terminal
Connec-
tor
Terminal
F14
9
E10
112
10
11
18
19
21
JMBIA1886GB
JMBIA0035GB
IGNITION SIGNAL
EC-503
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2. Check the voltage between ECM harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Refer to
.
2.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Turn ignition switch ON.
4. Check the voltage between condenser harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between IPDM E/R harness connector and condenser harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> Refer to
.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between condenser harness connector and ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to power in harness or connectors.
5.
CHECK CONDENSER
EC-506, "Component Inspection (Condenser)"
ECM
Voltage
Connector
+
–
Terminal
Terminal
E10
105
112
Battery voltage
JMBIA1887ZZ
Condenser
Ground
Voltage
Connector
Terminal
F26
1
Ground
Battery voltage
PBIB0624E
IPDM E/R
Condenser
Continuity
Connector
Terminal
Connector
Terminal
F10
49
F26
1
Existed
Condenser
Ground
Continuity
Connector
Terminal
F26
2
Ground
Existed
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