Nissan Altima L32. Instruction — part 336
FUEL INJECTOR
EC-465
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
11.1 - 14.3
Ω [at 10 -60°C (50 - 140°F)]
JMBIA1637ZZ
EC-466
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000004349528
*: 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:0000000004349529
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:0000000004349530
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
FUEL PUMP
EC-467
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 second
after ignition switch is turned ON.
PBIB0624E
IPDM E/R
Condenser-I
Continuity
Connector Terminal
Connector Terminal
F18
13
B17
1
Existed
EC-468
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
FUEL PUMP
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 7.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E29, B10
• IPDM E/R connector F10
• Harness for open or short between IPDM E/R and condenser-I
>> Repair open circuit or short to power in harness or connectors.
7.
CHECK CONDENSER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.
3. Check the continuity between condenser-I harness connector and ground.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair open circuit or short to power in harness or connectors.
8.
CHECK CONDENSER-1
EC-469, "Component Inspection (Condenser-1)"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace condenser-1.
9.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check the continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel pump” and
ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector E29, B10
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
• Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to power in harness or connectors.
11.
CHECK FUEL PUMP GROUND CIRCUIT
1. Check the continuity between “fuel level sensor unit and fuel pump” and ground.
Condenser-I
Ground
Continuity
Connector
Terminal
B17
2
Ground
Existed
IPDM E/R
Fuel level sensor unit
and fuel pump
Continuity
Connector Terminal
Connector Terminal
E18
13
B42
1
Existed
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст