Engine Controls Schematic Icons
Engine Controls Schematic Icons Icon Icon Definition NOTE: The OBD II symbol is used on the circuit diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the malfunction indicator lamp (MIL) to turn ON, or causes emissions-related component damage, is identified as an OBD II circuit
Scheme 93
Scheme 93: Engine Controls Schematic Icons
Scheme 94
Scheme 94: Engine Controls Schematics
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Scheme 101
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Scheme 108
Scheme 108: Engine Controls Component Views
| Callout | Component Name |
|---|
| 1 | Powertrain Control Module (PCM) |
| 2 | PCM Connector C1 and C2 |
Scheme 109
| Callout | Component Name |
|---|
| 1 | Evaporative Emissions (EVAP) Canister Vent Solenoid Connector |
| 2 | Evaporative Emissions (EVAP) Canister Vent Solenoid |
Scheme 110
| Callout | Component Name |
|---|
| 1 | Evaporative Emission (EVAP) Canister Purge Solenoid |
Scheme 111
| Callout | Component Name |
|---|
| 1 | Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 |
Scheme 112
| Callout | Component Name |
|---|
| 1 | Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 |
Scheme 113
| Callout | Component Name |
|---|
| 1 | Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 |
| 2 | Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 |
| 3 | Vehicle Speed Sensor (VSS) |
| 4 | Park/Neutral Position (PNP) Switch Connectors C1 and C2 |
| 5 | Park/Neutral Position (PNP) Switch |
| 6 | Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 |
Scheme 114
| Callout | Component Name |
|---|
| 1 | Fuel Pump and Sender Assembly Connector |
| 2 | Fuel Pump and Sender Assembly - Primary |
Scheme 115
| Callout | Component Name |
|---|
| 1 | Exhaust Gas Recirculation (EGR) Connector |
| 2 | Exhaust Gas Recirculation (EGR) Valve |
| 3 | Crankshaft Position (CKP) Sensor Connector |
| 4 | Crankshaft Position (CKP) Sensor |
| 5 | Engine Oil Pressure (EOP) Sensor |
| 6 | Engine Oil Pressure (EOP) Sensor Connector |
Scheme 116
| Callout | Component Name |
|---|
| 1 | Fuel Pump and Sender Assembly - Secondary |
| 2 | Fuel Pump and Sender Assembly Connector |
Scheme 117
| Callout | Component Name |
|---|
| 1 | Fuel Pump Relay - Secondary |
Scheme 118
| Callout | Component Name |
|---|
| 1 | Throttle Actuator Control (TAC) Module |
| 2 | Throttle Actuator Control (TAC) Connector |
| 3 | Fuse Block - Underhood |
Scheme 119
| Callout | Component Name |
|---|
| 1 | Clamp |
| 2 | Air Duct |
| 3 | Clamp |
| 4 | Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) |
| 5 | Air Cleaner Assembly |
| 6 | Air Restriction Indicator |
Scheme 120
| Callout | Component Name |
|---|
| 1 | Engine |
| 2 | Injector Connector |
| 3 | Ignition Coil |
| 4 | Ignition Coil Connector |
| 5 | Throttle Position (TP) Sensor Connector |
| 6 | Throttle Actuator Control (TAC) Motor Connector |
| 7 | Evaporative Emissions (EVAP) Canister Purge Solenoid Connector |
| 8 | Generator Connector |
Scheme 121
| Callout | Component Name |
|---|
| 1 | Engine |
| 2 | Camshaft Position (CMP) Sensor |
| 3 | Camshaft Position (CMP) Sensor Connector |
Scheme 122
| Callout | Component Name |
|---|
| 1 | Engine Harness |
| 2 | Manifold Absolute Pressure (MAP) Sensor |
| 3 | Manifold Absolute Pressure (MAP) Sensor Connector |
| 4 | Engine |
| 5 | Ignition Coil Connector (Engine Side) |
| 6 | Throttle Actuator Control (TAC) Motor |
| 7 | Ignition Coil Connector (Harness Side) |
| 8 | Engine Coolant Temperature (ECT) Sensor Connector |
| 9 | Ignition Coil |
Scheme 123
| Callout | Component Name |
|---|
| 1 | A/C Compressor Clutch |
| 2 | A/C Compressor Clutch Connector |
| 3 | Engine Wiring Harness |
| 4 | Engine Oil Level Sensor Connector |
| 5 | Knock Sensor (KS) 2 Connector |
| 6 | Knock Sensor (KS) 2 |
| 7 | Starter Relay Output (S-Terminal Feed) |
Scheme 124
| Callout | Component Name |
|---|
| 1 | Engine |
| 2 | Knock Sensor (KS)-1 |
| 3 | Knock Sensor (KS)-1 Connector |
| 4 | Engine Harness |
| 5 | Engine Harness Ground |
Scheme 125
| Callout | Component Name |
|---|
| 1 | Accelerator Pedal Position (APP) Sensor Connector |
| 2 | Accelerator Pedal Position (APP) Sensor |
Malfunction Indicator Lamp (MIL) Operation
The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON
Scheme 126
Scheme 126: Malfunction Indicator Lamp (MIL) Operation
Scheme 127
The MIL indicates that an emissions related fault has occurred and vehicle service is required.
The following is a list of the modes of operation for the MIL
- The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate.
- The MIL turns OFF after the engine is started if a diagnostic fault is not present.
- The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
- The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
- When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
- When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
Fuel System Overview
The Fuel System is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions.
An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times.
Fuel Metering Modes of Operation
The powertrain control module (PCM) reads voltages from several sensors in order to determine how much fuel to give the engine. The fuel is delivered under one of several conditions called modes. The PCM controls all modes.
EVAP System Operation
The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.
Electronic Ignition (EI) System Description
The electronic ignition (EI) system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time. This provides optimal performance, fuel economy, and control of exhaust emissions. This ignition system consists of a separate ignition coil connected to each spark plug by a short secondary wire. The driver modules within each coil assembly are commanded ON/OFF by the powertrain control module (PCM). The PCM primarily uses engine speed and position information from the crankshaft and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark. The EI system consists of the following components
Modes of Operation
There is one normal mode of operation, with the spark under PCM control. If the CKP pulses are lost the engine will not run. The loss of a CMP signal may result in a longer crank time since the PCM cannot determine which stroke the pistons are on. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.
Sensor Description
This knock sensor (KS) system uses one or 2 broadband one-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration, or noise, level. The amplitude and frequency are dependant upon the level of knock that the KS detects. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the engine block through the sensor housing.
One way the control module monitors the system is by output of a bias voltage on the KS signal wire. The bias voltage creates a voltage drop that the control module monitors and uses to help diagnose KS faults. The KS noise signal rides along this bias voltage, and due to the constantly fluctuating frequency and amplitude of the signal, will always be outside of the bias voltage parameters.
Another way the control module monitors the system is by learning the average normal noise output from the KS. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. The control module uses this noise channel, and the KS signal that rides along the noise channel, in much the same way as the bias voltage type does. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal.
In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will fall within the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output.
Air Intake System Description
The primary function of the air intake system is to provide filtered air to the engine. The system uses a cleaner element mounted in a housing. The cleaner housing is remotely mounted and uses intake ducts to route the incoming air into the throttle body. The secondary function of the air intake system is to muffle air induction noise. This is achieved through the use of resonators attached to the air intake ducts. the resonators are tuned to the specific powertrain. The mass air flow (MAF) sensor is attached to the outlet of the air cleaner housing. The air cleaner life indicator is located on an intake duct between the air cleaner housing and the throttle plate.
