Electronic: Other Ford Expedition I

Air Compressor Relay

Relay is located on right side of engine compartment, under air compressor assembly.

Air Compressor Vent Solenoid

Vent solenoid is part of air compressor assembly.

Air Shock Absorber

Air shock absorbers are located at front corners of vehicle, between frame and axle.

Air Suspension Control Module

Air suspension control module is located behind right side of instrument cluster panel.

Note. Air suspension control module may also be referred to as simply a control module or the 4 Wheel Air Suspension (4WAS) module.

Air Suspension Height Sensor (Front)

Front height sensor is located between frame and left upper control arm bracket.

Air Suspension Height Sensor (Rear)

Rear height sensor is located between crossmember No. 5 and rear axle panhard rod (track bar).

Air Suspension Switch

Air suspension switch is located under glove box, in right kick panel.

Air Suspension Warning Light

Warning light is located in instrument cluster.

Data Link Connector (DLC)

DLC is located under steering column.

Front Air Fill Solenoid

Front air fill solenoid is located in engine compartment, near transmission oil cooler.

Gate Solenoid

Gate solenoid is located in front of A/C condenser.

GEM is located behind center of instrument panel.

Powertrain Control Module (PCM)

PCM is located on right side of engine compartment.

Rear Air Fill Solenoid

Rear air fill solenoid is located on left frame rail, near center of vehicle.

Vehicle Speed Sensor (VSS)

VSS is located at rear of transmission.

Air Compressor Relay is mounted on bracket near right headlight. Relay, solid state type controlled by the air suspension control module, provides high current flow required to operate air compressor motor.

Air suspension control module may also be referred to as simply control module or 4 Wheel Air Suspension (4WAS) module. Air suspension control module is located behind right center of instrument cluster panel. Module controls air compressor and all system solenoids. Control module also provides power to height sensors. Control module outputs are controlled by monitoring height sensors, Vehicle Speed Sensor (VSS), steering sensor, acceleration input, door ajar signal, 2 transfer case signals (on 4WD models) and brake switch feedback signals. Control module conducts all fail-safe strategies and incorporates self-diagnostic and communication capabilities.

Two system-specific front air shock absorbers are used in the 4WD system. Air shock absorber is not repairable. If one fails, both should be replaced.

AIR SPRING SOLENOID VALVE

Air spring solenoid valve allows air to enter or exit rear air spring. Solenoid valve receives signals from air suspension control module. Air spring solenoid valve is located on top of air spring.

AIR SUSPENSION HEIGHT SENSOR

Front air suspension height sensor is located between frame and left upper control arm bracket. Rear height sensor is located between crossmember No. 5 and rear axle panhard rod (track bar). Height sensors send voltage signals to control module. These signals, combined with other inputs, help control module adjust ride height as conditions require.

Front Fill Solenoid (4WD)

Front fill solenoid connects air compressor to front air shock absorbers. When energized, riding height of body can be modified, relative to front axle. Front fill solenoid can be used to bleed air from front shock absorbers.

Rear Fill Solenoid (All Models)

Rear fill solenoid connects air compressor to rear air springs. When energized, along with front gate solenoid, riding height of body can be modified, relative to rear axle.

Gate solenoid may also be referred to as front gate solenoid. Gate solenoid, located in front of A/C condenser, provides pneumatic isolation of right and left sides of vehicle. This is necessary to prevent transfer of air from right side to left side shock absorbers during roll conditions. When solenoid is off, right and left sides are separated, allowing a pressure differential to be generated. In a turn, increased air pressure in outermost shock absorbers raises the two outermost spring rates, decreasing the roll.

STEERING SENSOR

Steering sensor, located on steering column, provides steering rates and position to the air suspension control module. Signals are provided through 2 sensors, steering sensor "A" and steering sensor "B".

INFLATING/DEFLATING AIR SUSPENSION SYSTEM

Note. Inflating or deflating air suspension system is necessary to adjust ride height.

1. Turn ignition on. Connect New Generation Star (NGS) tester (007-00500) to Data Link Connector (DLC). DLC is located under steering column. Select proper vehicle, year and engine type.
2. Select AIR SUSPENSION CONTROL MODULE under active command mode. Turn on following active commands as necessary: Select VENT FRNT to lower front of vehicle. Select LIFT FRNT to raise front of vehicle. Select VENT REAR to lower rear of vehicle. Select LIFT REAR to raise rear of vehicle.

PURGING AIR SUSPENSION SYSTEM

Note. If oil or water is found in air suspension system, air lines and components must be purged. If oil is found, carefully inspect affected components for deterioration and operation. Replace as necessary.

Front Air System

1. Disconnect both ends of air line between air drier and front fill solenoid. Connect shop air to air line and blow out any fluid. Reconnect air line.
2. Disconnect air line to front fill solenoid at compressor air drier. Disconnect air line from right front air shock absorber. Connect New Generation Star (NGS) tester (007-00500) to Data Link Connector (DLC) located under steering column. Select active command mode for proper vehicle, year and engine. Select 4WAS FRNT_FILL ON. Connect shop air to air line and blow out any fluid. Reconnect air line to right front air shock absorber.
3. Disconnect air line from left front air shock absorber. Using NGS tester, select active command mode 4WAS FRNT_FILL ON and GATEVALVE ON. Connect shop air to air line and blow out any fluid.
4. If oil is found, replace both front shock absorbers and compressor air drier. See «FRONT SHOCK ABSORBERS»(ref-1319-S29962729932000031300000) and «COMPRESSOR AIR DRIER»(ref-1319-S02979250642000031300000) under REMOVAL & INSTALLATION. Reconnect air lines.

Rear Air System

1. Disconnect both ends of air line between air drier and rear fill solenoid. Connect shop air to air line and blow out any fluid. Reconnect air line.
2. Disconnect air line to rear fill solenoid at compressor air drier. Disconnect air line from both rear air springs. Using NGS tester, select active command mode for proper vehicle, year and engine. Select 4WAS_REAR_FILL ON. Connect shop air to air line and blow out any fluid. Replace compressor air drier. See «COMPRESSOR AIR DRIER»(ref-1319-S02979250642000031300000) under REMOVAL & INSTALLATION. Reconnect air lines.

Visual Checks

Note. Instrument panel fuse/relay box may also be referred to as central junction box. Power distribution box may also be referred to as the battery junction box.

Ensure battery is fully charged and battery cables are clean and tight. Check for the following conditions

1. Shock absorber failure or improper installation.
2. Air line leaks or kinks.
3. Air spring leaks or ruptures.
4. Damaged or improperly installed height sensor(s).
5. Loose or corroded connectors.
6. Faulty fuse(s) No. 4 (15-amp), No. 6 (5-amp) and/or No. 20 (5-amp) in instrument panel fuse/relay box.
7. Faulty power distribution box fuses No. 4 (15-amp), No. 15 (50-amp) and/or No. 109 (50-amp).

Pretest Checks

Ensure the following conditions are met before performing on-demand self-test

1. All doors, liftgate and liftgate glass are closed.
2. Transmission is in Park.
3. Brake On/Off (BOO) Switch is not on during test.
4. Parking brake is released.
5. Accelerator pedal is fully released.
6. On 4WD vehicles, transfer case is not in 4L position.

On-Demand Self-Test

Note. On-demand self-test may be used to verify that no electrical faults exist in air suspension system. If instructed to perform on-demand self-test from a specified test procedure, ensure ignition switch is in proper position as listed in test procedure.

1. Connect New Generation Star (NGS) scan tester (007-00500) to Data Link Connector (DLC) according to manufacturer's instructions. DLC is located under steering column.
2. Turn ignition on. Rotate dial on scan tester to DIAGNOSTIC DATA LINK menu and press trigger.
3. Rotate dial on scan tester to highlight the desired module to be tested and press trigger. Ensure DIAGNOSTIC TEST MODES is highlighted and press trigger.
4. Rotate dial on scan tester to highlight on-demand self-test and press trigger. Press button No. 3 to start the test. Press trigger. Record any on-demand self-test Diagnostic Trouble Codes (DTCs) that are displayed. on-demand self-test DTCs must be serviced first.
5. Retrieve all stored continuous DTCs. Compare DTCs to «ELECTRONIC AIR SUSPENSION SYSTEM DTC INDEX»(ref-1319-S34571435212000031300000) table. Service DTCs as necessary. Clear all DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES (DTC)»(ref-1319-S17706650502000031300000) .

Using NGS Tester

After all DTCs have been serviced, follow manufacturer's instructions to clear stored DTCs. After initiating clearing procedure with NGS tester, ignition switch must be cycled from ON to OFF to ON positions. This will complete DTC clearing sequence.

Using Key Cycling Method

ABS control module will automatically clear all serviced DTCs that have not recurred after 80 normal key cycles have occurred.

ELECTRONIC AIR SUSPENSION SYSTEM DTC INDEX

ELECTRONIC AIR SUSPENSION SYSTEM SYMPTOM INDEX

COMPRESSOR AIR DRIER

Note. DO NOT damage "O" ring located between compressor air drier and air compressor head.