Nissan Altima L32. Instruction — part 459
FUEL INJECTOR
EC-957
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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4. Check the voltage between fuel injector harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F10
• 10A fuse (No. 35)
• Harness for open or short between fuel injector and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel injector harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FUEL INJECTOR
EC-957, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace malfunctioning fuel injector.
5.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
Component Inspection
INFOID:0000000004349951
1.
CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
Fuel injector
Ground
Voltage
Cylinder
Connector
Terminal
1
F17
1
Ground
Battery voltage
2
F18
1
3
F19
1
4
F20
1
JMBIA1636ZZ
Fuel injector
ECM
Continuity
Cylinder
Connector
Terminal
Connector
Terminal
1
F17
2
F14
32
Existed
2
F18
2
31
3
F19
2
30
4
F20
2
29
EC-958
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
FUEL INJECTOR
2. Disconnect fuel injector harness connector.
3. Check resistance between fuel injector terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning fuel injector.
Terminals
Resistance
1 and 2
10.4 - 15.3
Ω [at 10 -60°C (50 - 140°F)]
JMBIA1637ZZ
FUEL PUMP
EC-959
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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FUEL PUMP
Description
INFOID:0000000004349952
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
Component Function Check
INFOID:0000000004349953
1.
CHECK FUEL PUMP FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose (2) with two fingers.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>>
.
Diagnosis Procedure
INFOID:0000000004349954
1.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
Sensor
Input signal to ECM
ECM Function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
↓
Fuel pump
Battery
Battery voltage*
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 1 second.
Engine running and cranking
Operates.
When engine is stopped
Stops in 1.5 seconds.
Except as shown above
Stops.
1
: Air cleaner assembly
: Vehicle front
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
ALBIA0080ZZ
EC-960
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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
1. Turn ignition switch OFF.
2. Disconnect IDPDM E/R harness connector F10.
3. Check the continuity between IPDM E/R harness connector and ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-I
1. Reconnect all harness connectors disconnected.
2. Disconnect condenser-1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between condenser-1 harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse (No. 32) from IPDM E/R.
3. Check 15A fuse.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace fuse.
5.
CHECK CONDENSER-1 POWER SUPPLY CIRCUIT-II
1. Disconnect IPDM E/R harness connector E18.
2. Check the continuity between IPDM E/R harness connector and condenser-1 harness connector.
3. Also check harness for short to ground and short to power.
ECM
Ground
Voltage
Connector
Terminal
F14
14
Ground
Battery voltage
PBIB3605E
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F14
14
F10
77
Existed
Condenser-1
Ground
Voltage
Connector
Terminal
B17
1
Ground
Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.
PBIB0624E
IPDM E/R
Condenser-I
Continuity
Connector
Terminal
Connector
Terminal
F18
13
B17
1
Existed
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