Nissan Frontier. Instruction — part 472
REFRIGERANT PRESSURE SENSOR
EC-459
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
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EC
N
P
O
1. Disconnect refrigerant pressure sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between refrigerant pressure sensor terminal 3
and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E5, F14
• Harness for open or short between ECM and refrigerant pressure sensor
>> Repair harness or connectors.
5.
CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 40.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E5, F14
• Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 39 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
BBIA0627E
Voltage: Approximately 5V
PBIB1872E
Continuity should exist.
Continuity should exist.
EC-460
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
REFRIGERANT PRESSURE SENSOR
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E5, F14
• Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
OK or NG
OK
>> Replace refrigerant pressure sensor. Refer to
HA-36, "Removal and Installation"
NG
>> Repair or replace.
ENGINE CONTROL SYSTEM SYMPTOMS
EC-461
< SYMPTOM DIAGNOSIS >
[QR25DE]
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SYMPTOM DIAGNOSIS
ENGINE CONTROL SYSTEM SYMPTOMS
Symptom Matrix Chart
INFOID:0000000009481165
SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM
Reference
page
HARD/NO ST
AR
T
/REST
AR
T
(EXCP
.
H
A
)
ENGINE ST
ALL
HESIT
A
TION/SURGING/FLA
T
SPOT
SP
ARK KNOCK/DET
O
NA
TION
LACK
OF POWER/
POOR
ACC
E
LERA
TION
HIGH IDL
E/LOW
IDLE
ROUG
H IDLE/HUNTING
IDLI
NG VIBRA
TION
SLOW
/NO RETURN T
O
IDLE
OVERHEA
T
S/W
A
TER TEMPERA
T
UR
E
HIGH
EXCESS
IVE F
U
E
L CONSUMP
T
IO
N
EXCESS
IVE OIL CONSUMP
T
ION
BA
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG AH
AJ
AK
AL
AM HA
Fuel
Fuel pump circuit
1
1
2
3
2
2
2
3
2
Fuel pressure regulator system
3
3
4
4
4
4
4
4
4
4
Fuel injector circuit
1
1
2
3
2
2
2
2
Evaporative emission system
3
3
4
4
4
4
4
4
4
4
Air
Positive crankcase ventilation sys-
tem
3
3
4
4
4
4
4
4
4
4
1
Incorrect idle speed adjustment
3
3
1
1
1
1
1
Electric throttle control actuator
1
1
2
3
3
2
2
2
2
2
2
Ignition Incorrect ignition timing adjustment
3
3
1
1
1
1
1
1
Ignition circuit
1
1
2
2
2
2
2
2
Power supply and ground circuit
2
2
3
3
3
3
3
2
3
Mass air flow sensor circuit
1
1
2
2
2
2
2
2
Engine coolant temperature sensor circuit
1
1
2
2
2
3
2
2
3
1
2
Throttle position sensor circuit
1
2
2
2
2
2
2
2
Accelerator pedal position sensor circuit
3
2
1
2
2
EC-462
< SYMPTOM DIAGNOSIS >
[QR25DE]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
SYSTEM — ENGINE MECHANICAL & OTHER
Air fuel ratio (A/F) sensor 1 circuit
1
2
3
2
2
2
2
,
,
,
,
Knock sensor circuit
2
2
3
Crankshaft position sensor (POS) circuit
2
2
Camshaft position sensor (PHASE) circuit
2
2
Vehicle speed signal circuit
2
3
3
3
Power steering pressure sensor circuit
3
3
3
3
ECM
2
2
3
3
3
3
3
3
3
3
3
,
Intake valve timing control solenoid valve cir-
cuit
3
3
2
1
3
2
2
3
3
Park/neutral position (PNP) signal circuit
3
3
3
3
3
3
3
Refrigerant pressure sensor circuit
2
3
3
3
3
4
Electrical load signal circuit
3
3
3
3
Air conditioner circuit
2
2
3
3
3
3
3
3
3
3
2
SYMPTOM
Reference
page
HARD/NO S
TA
R
T/RES
TA
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
LOW/NO RETU
RN
T
O ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
XCESSIVE
FUEL CON
S
UMP
T
ION
E
XCESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC AD
AE
AF
AG AH
AJ
AK
AL
AM HA
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