2001 NISSAN PICK-UP coolant

DTC Confirmation Procedure .......................... 3308
Diagnostic Procedure....................................... 3309
DTC P1143 HO2S1.............................................. 3310
Component Description ................................... 3310
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3310
ECM Terminals and Reference Value ............. 3310
On Board Diagnosis Logic ............................... 3311
DTC Confirmation Procedure .......................... 3311
Overall Function Check ................................... 3312
Diagnostic Procedure....................................... 3312
DTC P1144 HO2S1.............................................. 3317
Component Description ................................... 3317
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3317
ECM Terminals and Reference Value ............. 3317
On Board Diagnosis Logic ............................... 3318
DTC Confirmation Procedure .......................... 3318
Overall Function Check ................................... 3319
Diagnostic Procedure....................................... 3319
DTC P1146 HO2S2.............................................. 3324
Component Description ................................... 3324
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3324
ECM Terminals and Reference Value ............. 3324
On Board Diagnosis Logic ............................... 3324
DTC Confirmation Procedure .......................... 3325
Overall Function Check ................................... 3326
Wiring Diagram ................................................ 3327
Diagnostic Procedure....................................... 3328
DTC P1147 HO2S2.............................................. 3334
Component Description ................................... 3334
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3334
ECM Terminals and Reference Value ............. 3334
On Board Diagnosis Logic ............................... 3334
DTC Confirmation Procedure .......................... 3335
Overall Function Check ................................... 3336
Wiring Diagram ................................................ 3337
Diagnostic Procedure....................................... 3338
DTC P1217 Engine Over Temperature............. 3344
On Board Diagnosis Logic ............................... 3344
Overall Function Check ................................... 3344
Diagnostic Procedure....................................... 3345
Main 11 Causes of Overheating ...................... 3348
DTC P1336 CKP Sensor (OBD)......................... 3349
Component Description ................................... 3349
ECM Terminals and Reference Value ............. 3349
On Board Diagnosis Logic ............................... 3350
DTC Confirmation Procedure .......................... 3350
Wiring Diagram ................................................ 3351
Diagnostic Procedure....................................... 3352
DTC P1706 PNP Switch..................................... 3355
Component Description ................................... 3355CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3355
ECM Terminals and Reference Value ............. 3355
On Board Diagnosis Logic ............................... 3355
DTC Confirmation Procedure .......................... 3356
Overall Function Check ................................... 3357
Wiring Diagram ................................................ 3358
Diagnostic Procedure....................................... 3359
Ignition Signal..................................................... 3361
Component Description ................................... 3361
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3361
ECM Terminals and Reference Value ............. 3362
Wiring Diagram ................................................ 3363
Diagnostic Procedure....................................... 3365
Injector................................................................. 3369
Component Description ................................... 3369
ECM Terminals and Reference Value ............. 3369
Wiring Diagram ................................................ 3370
Diagnostic Procedure....................................... 3371
Start Signal......................................................... 3374
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3374
ECM Terminals and Reference Value ............. 3374
Wiring Diagram ................................................ 3375
Diagnostic Procedure....................................... 3376
Fuel Pump........................................................... 3378
System Description .......................................... 3378
Component Description ................................... 3378
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3378
ECM Terminals and Reference Value ............. 3379
Wiring Diagram ................................................ 3380
Diagnostic Procedure....................................... 3381
Power Steering Oil Pressure Switch................ 3385
Component Description ................................... 3385
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3385
ECM Terminals and Reference Value ............. 3385
Wiring Diagram ................................................ 3386
Diagnostic Procedure....................................... 3387
IACV-FICD Solenoid Valve................................ 3389
Component Description ................................... 3389
ECM Terminals and Reference Value ............. 3389
Wiring Diagram ................................................ 3390
Diagnostic Procedure....................................... 3392
MI & Data Link Connectors............................... 3396
Wiring Diagram ................................................ 3396
Service Data and Specifications (SDS)............ 3398
Fuel Pressure Regulator .................................. 3398
Idle Speed and Ignition Timing ........................ 3398
Ignition Coil ...................................................... 3398
Mass Air Flow Sensor...................................... 3398
Engine Coolant Temperature Sensor .............. 3398
EC-3004

Fuel Pump........................................................ 3398
IACV-AAC Valve .............................................. 3398
Injector ............................................................. 3398
Throttle Position Sensor .................................. 3399
Heated Oxygen Sensor 1 Heater .................... 3399
Calculated Load Value..................................... 3399
Intake Air Temperature Sensor ....................... 3399
Heated Oxygen Sensor 2 Heater .................... 3399
Crankshaft Position Sensor (OBD) .................. 3399
YD25DDTi
TROUBLE DIAGNOSIS - INDEX........................ 3400
Alphabetical & Numerical Index for DTC......... 3400
PRECAUTIONS................................................... 3402
Precautions ...................................................... 3402
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM............................................................... 3405
Engine Control Component Parts Location ..... 3405
Circuit Diagram ................................................ 3408
System Diagram .............................................. 3409
System Chart ................................................... 3410
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION..................................... 3411
Fuel Injection Control System.......................... 3411
Fuel Injection Timing Control System.............. 3413
Air Conditioning Cut Control ............................ 3413
Fuel Cut Control (at no load & high engine
speed) .............................................................. 3413
Crankcase Ventilation System ......................... 3414
BASIC SERVICE PROCEDURE......................... 3415
Injection Tube and Injection Nozzle ................ 3415
Electronic Control Fuel Injection Pump ........... 3419
Air Bleeding...................................................... 3426
Water Draining ................................................. 3426
Accelerator Position Sensor Idle Position
Learning ........................................................... 3427
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION..................................................... 3428
DTC and MIL Detection Logic ......................... 3428
Diagnostic Trouble Code (DTC) ...................... 3428
Malfunction Indicator Lamp (MIL) .................... 3429
CONSULT-II ..................................................... 3434
TROUBLE DIAGNOSIS - INTRODUCTION........ 3440
Introduction ...................................................... 3440
Work Flow ........................................................ 3442
TROUBLE DIAGNOSIS - BASIC INSPECTION. 3444
Basic Inspection ............................................... 3444
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION..................................................... 3450
Symptom Matrix Chart ..................................... 3450
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3460Major Sensor Reference Graph in Data
Monitor Mode ................................................... 3462
ECM Terminals and Reference Value ............. 3463
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT............................................................. 3469
Description ....................................................... 3469
Diagnostic Procedure....................................... 3469
TROUBLE DIAGNOSIS FOR POWER SUPPLY3470
Main Power Supply and Ground Circuit .......... 3470
DTC 0103 COOLANT TEMP SEN...................... 3480
Description ....................................................... 3480
On Board Diagnosis Logic ............................... 3480
DTC Confirmation Procedure .......................... 3480
Wiring Diagram ................................................ 3481
Diagnostic Procedure....................................... 3482
DTC 0104 VEHICLE SPEED SEN...................... 3484
Description ....................................................... 3484
ECM Terminals and Reference Value ............. 3484
On Board Diagnosis Logic ............................... 3484
Overall Function Check ................................... 3485
Wiring Diagram ................................................ 3486
Diagnostic Procedure....................................... 3488
DTC 0208 OVER HEAT....................................... 3489
Description ....................................................... 3489
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3489
ECM Terminals and Reference Value ............. 3490
On Board Diagnosis Logic ............................... 3490
Overall Function Check ................................... 3491
Wiring Diagram ................................................ 3492
Diagnostic Procedure....................................... 3493
Main 12 Causes of Overheating ...................... 3500
DTC 0301 ECM 2, DTC 901 ECM 12................. 3501
Description ....................................................... 3501
On Board Diagnosis Logic ............................... 3501
DTC Confirmation Procedure .......................... 3501
Diagnostic Procedure....................................... 3502
DTC 0401 INTAKE AIR TEMPERATURE
SENSOR.............................................................. 3503
Component Description ................................... 3503
On Board Diagnosis Logic ............................... 3503
DTC Confirmation Procedure .......................... 3503
Wiring Diagram ................................................ 3505
Diagnostic Procedure....................................... 3506
DTC 0402 P9zFUEL TEMP SEN......................... 3508
Description ....................................................... 3508
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3509
ECM Terminals and Reference Value ............. 3509
On Board Diagnosis Logic ............................... 3510
DTC Confirmation Procedure .......................... 3510
Wiring Diagram ................................................ 3511
Diagnostic Procedure....................................... 3513
EC-3005

Diagnostic Procedure....................................... 3599
DTC 0905 TURBO PRESSURE.......................... 3600
Component Description ................................... 3600
ECM Terminals and Reference Value ............. 3600
On Board Diagnosis Logic ............................... 3600
DTC Confirmation Procedure .......................... 3601
Wiring Diagram ................................................ 3602
Diagnostic Procedure....................................... 3603
DTC 1003 EGR VOLUME CONT/V..................... 3605
Description ....................................................... 3605
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3606
ECM Terminals and Reference Value ............. 3606
DTC Confirmation Procedure .......................... 3606
Wiring Diagram ................................................ 3607
Diagnostic Procedure....................................... 3609
DTC 1004 FUEL CUT SYSTEM1........................ 3614
Description ....................................................... 3614
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3615
ECM Terminals and Reference Value ............. 3615
On Board Diagnosis Logic ............................... 3615
DTC Confirmation Procedure .......................... 3616
Wiring Diagram ................................................ 3617
Diagnostic Procedure....................................... 3619
GLOW CONTROL SYSTEM............................... 3621
Description ....................................................... 3621
ECM Terminals and Reference Value ............. 3622
Wiring Diagram ................................................ 3623
Diagnostic Procedure....................................... 3624
START SIGNAL................................................... 3630Wiring Diagram ................................................ 3630
Diagnostic Procedure....................................... 3631
PARK/NEUTRAL POSITION (PNP) SWITCH.... 3633
Description ....................................................... 3633
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3633
ECM Terminals and Reference Value ............. 3633
Wiring Diagram ................................................ 3634
Diagnostic Procedure....................................... 3635
HEAT UP SWITCH.............................................. 3638
Component Description ................................... 3638
CONSULT-II Reference Value in Data Monitor
Mode ................................................................ 3638
ECM Terminals and Reference Value ............. 3638
Wiring Diagram ................................................ 3639
Diagnostic Procedure....................................... 3640
AIR CONDITIONER CONTROL.......................... 3644
Wiring Diagram ................................................ 3644
MIL & DATA LINK CONNECTORS.................... 3646
Wiring Diagram ................................................ 3646
SERVICE DATA AND SPECIFICATIONS
(SDS).................................................................... 3650
General Specifications ..................................... 3650
Injection Pump Numbers ................................. 3650
Injection Nozzle................................................ 3650
Engine Coolant Temperature Sensor .............. 3650
Intake Air Temperature Sensor ....................... 3650
Crankshaft Position Sensor (TDC) .................. 3650
Glow Plug......................................................... 3650
Accelerator Position Sensor ............................ 3650
EGR Volume Control Valve ............................. 3650
EC-3007

Special Service ToolsNEEC0007The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV10117100
(J36471-A)
Heated oxygen sensor
wrench
NT379
Loosening or tightening heated oxygen sensor 1
with 22 mm (0.87 in) hexagon nut
KV10114400
(J-38365)
Heated oxygen sensor
wrench
NT636
Loosening or tightening heated oxygen sensor 2
a: 22 mm (0.87 in)
(J-45178)
TPS test connector
LEC120A
Used to test the throttle position sensor
Commercial Service ToolsNEEC0008
Tool name Description
Fuel filler cap adapter
NT653
Checking fuel tank vacuum relief valve opening
pressure
Socket wrench
NT705
Removing and installing engine coolant tempera-
ture sensor
PREPARATIONKA24DE (EURO OBD)
Special Service Tools
EC-3016

System ChartNEEC0013
Input (Sensor) ECM Function Output (Actuator)
+Camshaft position sensor
+Mass air flow sensor
+Engine coolant temperature sensor
+Heated oxygen sensor 1
+Ignition switch
+Throttle position sensor
+PNP switch
+Air conditioner switch
+Knock sensor
+Crankshaft position sensor (OBD)
+Battery voltage
+Power steering oil pressure switch
+Vehicle speed sensor
+Intake air temperature sensor
+Heated oxygen sensor 2*1
+Closed throttle position switch*2Fuel injection & mixture ratio control Injectors
Distributor ignition system Power transistor
Idle air control systemIACV-AAC valve and IACV-FICD
solenoid valve
Fuel pump control Fuel pump relay
Heated oxygen sensor 1 monitor & on
board diagnostic systemMalfunction indicator
(On the instrument panel)
Heated oxygen sensors 1, 2 heater control Heated oxygen sensor heater
EVAP canister purge flow controlEVAP canister purge volume con-
trol solenoid valve
Air conditioning cut control Air conditioner relay
*1: Under normal conditions, this sensor is not for engine control operation.
*2: This switch will operate in place of the throttle position sensor to control EVAP parts if the sensor malfunctions.
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM
KA24DE (EURO OBD)
System Chart
EC-3023

Multiport Fuel Injection (MFI) System
DESCRIPTIONNEEC0014Input/Output Signal ChartNEEC0014S01
Sensor Input Signal to ECMECM func-
tionActuator
Camshaft position sensor Engine speed and piston position
Fuel injec-
tion & mix-
ture ratio
controlInjector Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 Density of oxygen in exhaust gas
Throttle position sensorThrottle position
Throttle valve idle position
PNP switch Gear position
Vehicle speed sensor Vehicle speed
Ignition switch Start signal
Air conditioner switch Air conditioner operation
Knock sensor Engine knocking condition
Battery Battery voltage
Power steering oil pressure switch Power steering operation
Heated oxygen sensor 2* Density of oxygen in exhaust gas
* Under normal conditions, this sensor is not for engine control operation.
Basic Multiport Fuel Injection SystemNEEC0014S02The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the camshaft position sensor and the mass air
flow sensor.
Various Fuel Injection Increase/Decrease CompensationNEEC0014S03In addition, the amount of fuel injected is compensated to improve engine performance under various oper-
ating conditions as listed below.

+During warm-up
+When starting the engine
+During acceleration
+Hot-engine operation
+High-load, high-speed operation

+During deceleration
+During high engine speed operation
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Multiport Fuel Injection (MFI) System
EC-3024

Mixture Ratio Feedback Control (Closed loop control)NEEC0014S04
SEC303D
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission con-
trol. The three way catalyst can then better reduce CO, HC and NOx emissions. This system uses a heated
oxygen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM adjusts
the injection pulse width according to the sensor voltage signal. For more information about the heated oxy-
gen sensor 1, refer to EC-3213. This maintains the mixture ratio within the range of stoichiometric (ideal air-
fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst. Even if the switching characteris-
tics of the heated oxygen sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from the
heated oxygen sensor 2.
Open Loop ControlNEEC0014S05The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
+Deceleration and acceleration
+High-load, high-speed operation
+Malfunction of heated oxygen sensor 1 or its circuit
+Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature
+High engine coolant temperature
+During warm-up
+When starting the engine
Mixture Ratio Self-learning ControlNEEC0014S06The mixture ratio feedback control system monitors the mixture ratio signal transmitted from the heated oxy-
gen sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close
to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as
originally designed. Both manufacturing differences (i.e., mass air flow sensor hot film) and characteristic
changes during operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This
is then computed in terms of ªinjection pulse durationº to automatically compensate for the difference between
the two ratios.
ªFuel trimº refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
ªShort term fuel trimº is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from the heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN com-
pared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich,
and an increase in fuel volume if it is lean.
ªLong term fuel trimº is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Multiport Fuel Injection (MFI) System
EC-3025

Fuel Injection TimingNEEC0014S07
SEF337W
Two types of systems are used.
Sequential Multiport Fuel Injection System
NEEC0014S0701Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
NEEC0014S0702Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
Fuel Shut-offNEEC0014S08Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Distributor Ignition (DI) System
DESCRIPTIONNEEC0015Input/Output Signal ChartNEEC0015S01
Sensor Input Signal to ECMECM func-
tionActuator
Camshaft position sensor Engine speed and piston position
Ignition tim-
ing controlPower transistor Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensorThrottle position
Throttle valve idle position
Vehicle speed sensor Vehicle speed
Ignition switch Start signal
Knock sensor Engine knocking
PNP switch Gear position
Battery Battery voltage
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Multiport Fuel Injection (MFI) System
EC-3026