Ä |
|
FUEL SYSTEMS 14 - 47 |
|
(2) Remove sensor using Tool C-4907 (Fig. 21). When the sensor is removed, the exhaust manifold
threads must be cleaned with an 18 mm X 1.5 + 6E tap. If the same sensor is to be reinstalled, the sensor threads must be coated with an anti-seize compound such as Loctite 771-64 or equivalent. New sensors are packaged with compound on the threads and do not require additional compound. The sensor must be tightened to 27 NIm (20 ft. lbs.) torque.
Fig. 21 Oxygen Sensor Socket
2.5L TURBO I MULTI-POINT FUEL INJECTIONÐSYSTEM OPERATION
INDEX
|
page |
|
Air Conditioning (A/C) Clutch RelayÐEngine |
|
|
Controller Output . . . . . . . . . . . . . . . . . . . . |
. . . |
52 |
Air Conditioning Switch SenseÐEngine Controller |
|
|
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . |
49 |
Alternator FieldÐEngine Controller Output . . . . |
. . |
53 |
Auto Shutdown (ASD) Relay and Fuel Pump |
|
|
RelayÐEngine Controller Output . . . . . . . . . . |
. . |
53 |
Automatic Idle Speed (AIS) MotorÐEngine |
|
|
Controller Output . . . . . . . . . . . . . . . . . . . . . . |
. . |
53 |
Barometric Read SolenoidÐEngine Controller |
|
|
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . |
53 |
Battery VoltageÐEngine Controller Input . . . . . . |
. . |
49 |
Brake SwitchÐEngine Controller Input . . . . . . . |
. . |
49 |
Canister Purge SolenoidÐEngine Controller |
|
|
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . |
53 |
CCD Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . |
48 |
Check Engine LampÐEngine Controller Output |
. . |
54 |
Coolant Temperature SensorÐEngine Controller |
|
|
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . |
49 |
Detonation Sensor (Knock Sensor)ÐEngine |
|
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . |
. . |
49 |
Diagnostic ConnectorÐEngine Controller Output |
. . |
54 |
Distributor (Hall Effect) Pick-UpÐEngine |
|
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . |
. . |
50 |
Engine Controller . . . . . . . . . . . . . . . . . . . . . . . |
. . |
48 |
Fuel InjectorÐEngine Controller Output . . . . . . |
. . |
54 |
GENERAL INFORMATION
The turbocharged multi-point electronic fuel injection system combines an electronic fuel and spark advance control system with a turbocharged intake system (Fig. 1). The fuel injection system is controlled by the Single Board Engine Controller II (SBEC II), referred to in this manual as the engine controller.
The engine controller regulates ignition timing, airfuel ratio, emission control devices, cooling fan, charging system, speed control, turbocharger wastegate and idle speed. The engine controller adapts its requirement to meet changing operating conditions.
page |
|
Fuel Injectors and Fuel Rail Assembly . . . . . . . . . |
57 |
Fuel Pressure Regulator . . . . . . . . . . . . . . . . . . . . |
57 |
Fuel Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . |
57 |
General Information . . . . . . . . . . . . . . . . . . . . . . . |
47 |
Ignition CoilÐEngine Controller Output . . . . . . . . . |
54 |
Manifold Absolute Pressure (MAP) SensorÐEngine |
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . . . |
50 |
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Oxygen Sensor (O2 Sensor)ÐEngine Controller |
|
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
50 |
Part Throttle Unlock SolenoidÐEngine Controller |
|
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Radiator Fan RelayÐEngine Controller Output . . . |
55 |
Speed Control SolenoidsÐEngine Controller |
|
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Speed ControlÐEngine Controller Input . . . . . . . . |
51 |
TachometerÐEngine Controller Output . . . . . . . . . |
55 |
Throttle Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
57 |
Throttle Position Sensor (TPS)ÐEngine |
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . . . |
51 |
Transmission Park/Neutral SwitchÐEngine |
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . . . |
51 |
Vehicle Distance (Speed) SensorÐEngine |
|
Controller Input . . . . . . . . . . . . . . . . . . . . . . . . . |
52 |
Wastegate Control SolenoidÐEngine Controller |
|
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Various sensors provide the inputs necessary for the engine controller to correctly regulate fuel flow at the fuel injector. These include the manifold absolute pressure, throttle position, oxygen sensor, coolant temperature, detonation, and vehicle distance sensors. In addition to the sensors, various switches and relays provide important information and system control. The inputs include the park/neutral switch and air conditioning clutch switch. The outputs include the auto shutdown relay and fuel pump relay.
All inputs to the engine controller are converted into signals. Based on these inputs the engine controller adjusts air-fuel ratio, ignition timing, turbocharger wastegate and other controlled outputs. The