Engine Controls - System & Component Testing - Titan: Other Nissan Titan I

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.

Scheme 990

Ignition Coil With Power Transistor

Refer to IGNITION COIL .

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Specification data are reference values.

Scheme 991

INJECTOR

Refer to FUEL INJECTOR AND FUEL TUBE .

Scheme 992

The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine startability. 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.

Scheme 993

Specification data are reference values.

Scheme 994

Fuel Pump

Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY .

Refrigerant Pressure Sensor

Refer to REMOVAL AND INSTALLATION FOR REFRIGERANT PRESSURE SENSOR .

Specification data are reference values.

Scheme 995

Scheme 996

Scheme 997

1. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I Turn ignition switch ON. Connect CONSULT-II and select "DATA MONITOR" mode. Select "LOAD SIGNAL" and check indication under the following conditions. OK or NG OK INSPECTION END NG: GO TO 2.
2. CHECK HEADLAMP SYSTEM : INSPECTION END

EVAP Canister

Note. To identify EVAP canister ports (Scheme 998)

Check EVAP canister as follows

Scheme 998

1. Block port B .
2. Blow air into port A and check that it flows freely out of port C .
3. Release blocked port B .
4. Apply vacuum pressure to port B and check that vacuum pressure exists at the ports A and C .
5. Block port A and B .
6. Apply pressure to port C and check that there is no leakage.

Scheme 999

Scheme 1000

1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum. Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm 2 , 2.22 - 2.90 psi) Vacuum: -6.0 to -3.3 kPa (-0.061 to -0.034 kg/cm 2 , -0.87 to -0.48 psi)
3. If out of specification, replace fuel filler cap as an assembly.

EVAP Canister Purge Volume Control Solenoid Valve

Refer to DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE .

Fuel Tank Temperature Sensor

Refer to DTC P0181 FTT SENSOR .

EVAP Canister Vent Control Valve

Refer to DTC P0447 EVAP CANISTER VENT CONTROL VALVE .

EVAP Control System Pressure Sensor

Refer to DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR .

EVAP Service Port

Positive pressure is delivered to the EVAP system through the EVAP service port. If fuel vapor leakage in the EVAP system occurs, use a leak detector to locate the leak.

Scheme 1001

Tighten EVAP canister as shown in the figure.

Scheme 1002

Scheme 1003

1. Turn EVAP canister vent control valve counterclockwise.
2. Remove the EVAP canister vent control valve. Always replace O-ring with a new one.

HOW TO DETECT FUEL VAPOR LEAKAGE

Note. Do not start engine. Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

WITH CONSULT-II

Scheme 1004

Scheme 1005

Scheme 1006

1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump and hose to the EVAP service port adapter.
3. Turn ignition switch ON.
4. Select the "EVAP SYSTEM CLOSE" of "WORK SUPPORT MODE" with CONSULT-II.
5. Touch "START". A bar graph (Pressure indicating display) will appear on the screen.
6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
7. Remove EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to «EVAPORATIVE EMISSION LINE DRAWING»(ref-169809-S38786464232004121600000) .

WITHOUT CONSULT-II

Scheme 1007

Scheme 1008

1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump with pressure gauge to the EVAP service port adapter.
3. Apply battery voltage to between the terminals of EVAP canister vent control valve to make a closed EVAP system.
4. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm 2 , 0.2 to 0.4 psi).
5. Remove EVAP service port adapter and hose with pressure pump.
6. Locate the leak using a leak detector. Refer to «EVAPORATIVE EMISSION LINE DRAWING»(ref-169809-S38786464232004121600000) .

Scheme 1009

From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere.

When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged during driving.

Scheme 1010

1. CHECK EVAP CANISTER Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 2.2 kg (4.9 lb). OK or NG OK : GO TO 2. NG : GO TO 3.
2. CHECK IF EVAP CANISTER SATURATED WITH WATER Does water drain from the EVAP canister? Yes or No Yes : GO TO 3. No : GO TO 5 .
3. REPLACE EVAP CANISTER Replace EVAP canister with a new one. : GO TO 4.
4. DETECT MALFUNCTIONING PART Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection. : Repair or replace EVAP hose.
5. CHECK REFUELING EVAP VAPOR CUT VALVE Refer to «COMPONENT INSPECTION»(ref-169809-S08376673192004121600000) . OK or NG OK : INSPECTION END NG : Replace refueling EVAP vapor cut valve with fuel tank.

Scheme 1011

1. CHECK EVAP CANISTER Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 2.2 kg (4.9 lb). OK or NG OK: GO TO 2. NG: GO TO 3.
2. CHECK IF EVAP CANISTER SATURATED WITH WATER Does water drain from the EVAP canister? (Scheme 1010) Yes or No Yes: GO TO 3. No: GO TO 5.
3. REPLACE EVAP CANISTER Replace EVAP canister with a new one.: GO TO 4.
4. DETECT MALFUNCTIONING PART Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.: Repair or replace EVAP hose.
5. CHECK VENT HOSES AND VENT TUBES Check hoses and tubes between EVAP canister and refueling control valve for clogging, kink, looseness and improper connection. OK or NG OK: GO TO 6. NG: Repair or replace hoses and tubes.
6. CHECK FILLER NECK TUBE Check recirculation line for clogging, dents and cracks. OK or NG OK: GO TO 7. NG: Replace filler neck tube.
7. CHECK REFUELING EVAP VAPOR CUT VALVE Refer to «COMPONENT INSPECTION»(ref-169809-S08376673192004121600000). OK or NG OK: GO TO 8. NG: Replace refueling EVAP vapor cut valve with fuel tank.
8. CHECK FUEL FILLER TUBE Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks. OK or NG OK: GO TO 9. NG: Replace fuel filler tube.
9. CHECK ONE-WAY FUEL VALVE-I Check one-way valve for clogging. OK or NG OK: GO TO 10. NG: Repair or replace one-way fuel valve with fuel tank.
10. CHECK ONE-WAY FUEL VALVE-II Make sure that fuel is drained from the tank. Remove fuel filler tube and hose. Check one-way fuel valve for operation as follows. When a stick is inserted, the valve should open, when removing stick it should close. Do not drop any material into the tank. OK or NG OK: INSPECTION END NG: Replace fuel filler tube or replace one-way fuel valve with fuel tank.

Refueling EVAP Vapor Cut Valve

With CONSULT-II

1. Remove fuel tank. Refer to «FUEL TANK»(ref-169458-S27295667372004120900000) in FUEL SYSTEM - TITAN article
2. Drain fuel from the tank as follows: Remove fuel feed hose located on the fuel gauge retainer. Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other side to a fuel container. Drain fuel using "FUEL PUMP RELAY" in "ACTIVE TEST" mode with CONSULT-II.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows. Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.

Scheme 1012

1. Connect vacuum pump to hose end.
2. Remove fuel gauge retainer with fuel gauge unit. Always replace O-ring with new one.
3. Put fuel tank upside down.
4. Apply vacuum pressure to hose end [-13.3 kPa (-100 mm Hg, -3.94 in Hg)] with fuel gauge retainer remaining open and check that the pressure is applicable.

Without CONSULT-II

1. Remove fuel tank. Refer to .
2. Drain fuel from the tank as follows: Remove fuel gauge retainer. Drain fuel from the tank using a handy pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows. Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.

1. Connect vacuum pump to hose end.
2. Remove fuel gauge retainer with fuel gauge unit. Always replace O-ring with new one.
3. Put fuel tank upside down.
4. Apply vacuum pressure to hose end [-13.3 kPa (-100 mm Hg, -3.94 in Hg)] with fuel gauge retainer remaining open and check that the pressure is applicable. (Scheme 1012)

Scheme 1013

This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold.

During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV valve.

Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.

The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover.

Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.

The flow goes through the hose connection in the reverse direction.

On vehicles with an excessively high blow-by, the valve does not meet the requirement. This is because some of the flow will go through the hose connection to the air inlet tubes under all conditions.

Scheme 1014

PCV (Positive Crankcase Ventilation) Valve

With engine running at idle, remove PCV valve ventilation hose from PCV valve; if the valve is working properly, a hissing noise will be heard as air passes through it and a strong vacuum should be felt immediately when a finger is placed over valve inlet.

Scheme 1015

Scheme 1016

1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any hose cannot be freed of obstructions, replace.

Scheme 1017

Scheme 1018

1. Air Conditioner Switch: Off
2. Electric Load: Off (Lights And Heater Fan)
3. Steering Wheel: Kept In Straight-Ahead Position

Scheme 1019

Scheme 1020

Scheme 1021

Scheme 1022

Scheme 1023

Scheme 1024

CRANKSHAFT POSITION SENSOR (POS)

Refer to DTC P0335 CKP SENSOR (POS) .

CAMSHAFT POSITION SENSOR (PHASE)

Refer to DTC P0340 CAMSHAFT POSITION (CMP) SENSOR (PHASE) .

Scheme 1025

Scheme 1026

Scheme 1027