Nissan Frontier. Instruction — part 468
FUEL PUMP
EC-443
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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4. Check voltage between ECM terminal 14 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 12.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E5, F14
• Harness for open or short between IPDM E/R and ECM
>> Repair harness or connectors.
5.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
4. Turn ignition switch ON.
5. Check voltage between “fuel level sensor unit and fuel pump”
terminal 1 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 6.
6.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse (No.48).
3. Check 15A fuse.
Voltage: Battery voltage
Voltage: Battery voltage
PBIB2656E
BBIA0545E
Voltage:
Battery voltage should exist for 1 second
after ignition switch is turned ON.
PBIB0795E
EC-444
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
FUEL PUMP
OK or NG
OK
>> GO TO 7.
NG
>> Replace fuse.
7.
CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV
1. Disconnect IPDM E/R harness connector E119.
2. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 1 and IPDM E/R termi-
nal 13.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• 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
EC-444, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel pump. Refer to
FL-10, "Removal and Installation"
12.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
OK or NG
OK
>> Replace IPDM E/R. Refer to
PCS-28, "Removal and Installation of IPDM E/R"
.
NG
>> Repair or replace harness or connectors.
Component Inspection
INFOID:0000000009481154
FUEL PUMP
Continuity should exist.
Continuity should exist.
FUEL PUMP
EC-445
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 1 and 3.
BBIA0545E
Resistance: 0.2 - 5.0
Ω [at 25°C (77°F)]
SEC918C
EC-446
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
IGNITION SIGNAL
IGNITION SIGNAL
Component Description
INFOID:0000000009481155
IGNITION COIL & POWER TRANSISTOR
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.
Diagnosis Procedure
INFOID:0000000009481156
1.
CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT)>>GO TO 2.
Yes (Without CONSULT)>>GO TO 3.
No
>> GO TO 4.
2.
CHECK OVERALL FUNCTION
With CONSULT
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
2. Make sure that each circuit produce a momentary engine speed drop.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
3.
CHECK OVERALL FUNCTION
Without CONSULT
1. Let engine idle.
2. Read the voltage signal between ECM terminals 9, 10, 11, 21 and ground with an oscilloscope.
3. Verify that the oscilloscope screen shows the signal wave as shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
4.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
2. Check voltage between ECM terminals 105 and ground with CONSULT or tester.
BBIA0604E
PBIB0521E
Voltage: Battery voltage
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