Suspension Control: Overview Toyota 4Runner IV рестайлинг

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1. WHEN LIFTING UP VEHICLE When jacking up or lifting up, stop operation of the air suspension control system by pressing the height control OFF switch.
2. DISCONNECTION AND CONNECTION OF HEIGHT CONTROL TUBE NOTE: Disconnection and connection of the height control tube should be performed by hand to prevent foreign objects from entering. Never damage the height control tube. Disconnect the height control tube. Pinch "A" of the connector No. 1 and pull out from the housing. Set the SST to the tube. SST 09730-00010 Insert SST into the housing to expand the claw of the connector No. 2 in the housing. Pull out the tube with SST inserted. NOTE: Do not pull on the tube with excessive force. Insert a screwdriver into the circular hole on the housing, and remove the connector No. 2, the 2 O-rings and the plate from the housing. HINT: The O-rings, plate and connector No. 2 are non-reusable parts. Install height control tube O-ring and the plate. NOTE: When replacing the parts on which the tube to be installed with a new one, it is not necessary to perform the procedure for installation. Apply MP grease to 2 new O-rings and plate and install them to the straight tube or an equivalent. NOTE: Install the plate between the O-rings. Keep foreign matter from adhering to the O-rings and the height control tube in order to prevent air leaks. Insert the tube on which the 2 O-rings and plate are installed into the housing, and then push it in lightly with a piece of rolled up cardboard. Push the connector No. 2 into the housing to where a clicking sound is heard. Install the height control tube. Push the tube and connector No. 1 into the housing to where a clicking sound is heard. NOTE: The port (hole) of the housing should be set in the position 90° from the claws of connector No. 1. Pull the tube lightly to make sure that it is securely connected. Prevent foreign matter from being attached to the O-rings and height control tube. Failure to do so may cause air leakage.
3. HANDLING PRECAUTIONS FOR CENTER UNIT AND SHOCK ABSORBER Replacement of each unit is allowed if there is no oil leakage. But, in case of oil leakage from the system, replace both the absorber and the center unit as a set. For replacement of the system, make it possible to replace a unit only at the first time and replace the system as a set of delivery at the second time or later. When carrying each unit, be sure to hold the body of the unit and never hang the body by holding joint parts or hoses. Also, do not deform metal tubes. Each unit should not be at a high temperature at the time of replacement. Since the shock absorber could be damaged by a sudden temperature change as being disconnected from the center unit, be careful about its storage. Do not loosen the union bolt except the time of the disposal of each unit. Never loosen the absorber hoses and the flare nuts at the joint parts.
4. REMOVAL AND INSTALLATION PRECAUTION FOR CENTER UNIT AND SHOCK ABSORBER Conduct the operations as stretching all the shock absorbers out by jacking up the vehicle. Never put a great compressive load to the shock absorbers, such as contacting the tires on the ground, before connecting them to the center unit to avoid the break down. Avoid the contacting surfaces of the joint parts to get any foreign objects, and wipe them away so as not to damage the O-rings in case of the adhesion. Be sure to fit the detentes attached to the bracket on the front absorber hose side, the rear absorber hose side and the middle unit joint part into a hole on the frame side. Never loosen the absorber hoses and the flare nuts at the joint parts. For the joint that is connecting the supplied parts, tighten the joint as checking the gap spacing shown in the illustration. Dimension of gap: 1 mm (0.04 in.) Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf)

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1. ADJUST STANDARD VEHICLE HEIGHT Release the parking brake and stabilize the suspensions by pushing up and down on the corners of the vehicle. Place the shift lever into the "N" position and settle the tires by moving the vehicle back and forth. Start the engine. On the height control switch, first press "HIGH" to raise the vehicle height, and then change the switch to "LOW" to lower it. Perform this operation one more time. NOTE: Make sure to release the parking brake and move the shift lever into the "N" position.
2. INSPECT TIRE (See «INSPECTION»(ref-280560-S00855197642008022200000) )
3. MEASURE VEHICLE HEIGHT (See «ADJUSTMENT»(ref-280558-S26893055632008022200000) )
4. OPERATE HEIGHT CONTROL SWITCH AND CHECK VEHICLE HEIGHT CHANGE Start the engine and change the height control switch from the NORMAL position to the HIGH and LOW positions. Check the time until the height adjustment is completed and the amount of change in vehicle height. Adjustment time: HEIGHT CONTROL SWITCH DESCRIPTION From operation of height control switch to start of compressor. Approx. 2 sec. From start of compressor to completion of height adjustment. 15 to 20 sec. (HIGH position) Amount of change in vehicle height: HIGH position: 40 mm (1.57 in.) LOW position: -20 mm (-0.79 in.) While adjusting vehicle height in the HIGH position, start the engine and change the height control switch from the HIGH and LOW position to the NORMAL position. Check the time until the height adjustment is completed and the amount of change in vehicle height. Adjustment time: HEIGHT CONTROL SWITCH DESCRIPTION From operation of height control switch to open of exhaust valve. Approx. 2 sec. From open of exhaust valve to completion of height adjustment. 10 to 15 sec. (HIGH position) Amount of change in vehicle height: HIGH position: 40 mm (1.57 in.) LOW position: -20 (-0.79 mm)
5. CHECK CONNECTIONS OF TUBES FOR AIR LEAKAGE Set the height control switch in the HIGH position and raise the vehicle height. Stop the engine. Apply soapy water to the connections of the tubes and check if there is any air leakage.
6. ADJUST VEHICLE HEIGHT NOTE: While adjusting vehicle height, do not put anyone or anything on or in the vehicle as it will affect vehicle height. Suspend the vehicle height control by pressing the height control mode select switch. Put the vehicle on a level surface. Measure the vehicle height (C - D measurement) on the right side and left side. Standard vehicle height value: See «ADJUSTMENT»(ref-280558-S26893055632008022200000) Difference between the right side and left side: 10 mm (0.39 in.) or less If the actual vehicle height differs from the vehicle height (C - D measurement), adjust it by jacking up the frame, etc. (Procedure "A"). Using the intelligent tester (Procedure "B"). Turn the ignition switch to ON or ACC. Using the intelligent tester, measure each vehicle height value of the right side and the left side sensors. Difference between the tester value and vehicle height (C - D measurement): 5 mm (0.20 in.) or less Difference between the right side and the left side: 5 mm (0.20 in.) or less Not using the intelligent tester (Procedure "C"). Disconnect the connector of the height control sensor. Connect three 1.5 V dry cell batteries in series. Connect the battery positive (+) and negative (-) to the terminals. Standard voltage VOLTAGE REFERENCE TABLE Position Voltage High 2.58 to 2.98 V Normal 2.11 to 2.51 V Low 1.76 to 2.16 V Difference between the right side and the left side: 0.2 V or less If the procedure "B" or "C" differs from the vehicle height (C - D measurement), adjust it by following the procedures below: Loosen the nut. Move the height control sensor link up and down along the slotted hole of the bracket. Adjust the vehicle height to the vehicle height (C - D measurement) while checking the value on the intelligent tester or voltmeter. Tighten the nut. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) If the vehicle height cannot be adjusted by performing procedure "A", adjust it again by following the procedures below: Loosen the 2 lock nuts of the height control sensor link. Adjust the vehicle height to the vehicle height (C - D measurement) by turning the link while checking the value on the intelligent tester or the voltmeter. Tighten the 2 lock nuts. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) Check that the lengths of the screw parts, "A", are within the standard values. Standard length: 6.5 to 15.0 mm (0.26 to 0.59 in.) Change the vehicle height. (From the normal position to the high position, and from the high position to the normal position) Measure the vehicle height (C - D measurement) on the right side and left side (Procedure "D"). Check if the vehicle height (C - D measurement) is within the specified range. HINT: If the values are outside the standard, perform the procedures from procedure "A" to "D" again.

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DESCRIPTION

Inside the sensor, a brush integrated with the control sensor rotor shaft moves above the resistor, providing linear output. Since the resistance value between the brush and resistor terminal changes in proportion to the shaft rotation angle, the fixed voltage applied to the resistor by ECU is modified by the sensor and output to the ECU as a voltage indicating the shaft rotation angle.

DTC DETECTION CONDITION TABLE

HINT

1. Once the ECU stores DTC C1713/13 or C1714/14 in the memory, vehicle height control is suspended and not carried out until a normal signal is input to the ECU from the height control sensor sub-assembly. However, the control resumes if the ignition switch is turned OFF, and then turned ON again.
2. When the suspension control ECU detects a malfunction in the height control sensor, the height control indicator light "N" comes on or blinks, and the height control switch ("HI" and "LO") is suspended.
3. When either one of the right or left height control sensor sub-assembly is faulty, the suspension control ECU uses the other one (functioning one) to adjust the vehicle height to the normal height. When both of the height control sensor sub-assembly are faulty, the suspension control ECU suspend the height control function immediately.

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The suspension control ECU opens the height control valve to lead the compressed air to the height control cylinder (pneumatic cylinder) and to raise the vehicle height.

When the vehicle height is lowered, the suspension control ECU opens the height control valve to store the compressed air in the low pressure tank temporarily, and then operates the exhaust solenoid valve to release the compressed air to the outside.

Further, the height control solenoid valve (gate solenoid valve) opens and closes the passage between the right and left pneumatic cylinder.

The height control valve is on the low pressure tank and consists of 3 valves in total, leveling solenoid valve, gate solenoid valve and tank solenoid valve.

The leveling solenoid valve opens and closes the passage between the compressor and the pneumatic cylinder. The gate solenoid valve opens and closes the passage between the right and left pneumatic cylinder. The tank solenoid valve opens and closes the passage between pneumatic cylinder and the low pressure tank. The exhaust solenoid valve is on the compressor unit and has only one valve.

DTC DETECTION CONDITION TABLE

HINT

1. Once the ECU stores DTC C1733/33, C1734/34, C1735/35 or C1744/44 in the memory, the vehicle height control is suspended out until a normal signal is input to the ECU from the height control solenoid valves and the exhaust solenoid valve. However, control is resumed if the ignition switch is turned OFF, then ON again.
2. Malfunction in the gate solenoid valve and the leveling solenoid valve: The height control operation is suspended, and the height control indicator light does not change by operating the height control switch.
3. Malfunction in the exhaust solenoid valve: The vehicle height is lowered to the normal height within 30 sec, and then the height control operation is suspended. The height control indicator light "N" comes on or blinks, and that of "HI" and "LO" do not illuminated by operating the height control switch "UP" and "DOWN".
4. Abnormality of the tank solenoid valve: Although the height control is still possible, the vehicle lowering speed may be slower.

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When the "UP" side of the height control switch is pressed, a signal is sent from terminal RC of the suspension control ECU to the AIR SUS relay to turn it on.

As a result, the current flows to the AIR SUS relay coil, closing the relay contact, and then the battery positive voltage is applied to the compressor, which causes the compressed air to raise the vehicle height.

DTC DETECTION CONDITION TABLE

HINT

Once the ECU stores DTC C1741/41 in the memory, the vehicle height control is suspended until a normal signal is input to the ECU from the AIR SUS relay. However, the control resumes if the ignition switch is turned OFF, and then turned ON again.

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When the "UP" side of the height control switch is pressed, a signal is sent from terminal RC of the suspension control ECU to switch the AIR SUS relay ON. As a result, the relay contacts close and the compressor motor turns on, producing compressed air.

The suspension control ECU detects the amount of current flow to the compressor motor by means of the differences in potential at terminals RM+ and RM- of the suspension control ECU. In this way, the suspension control ECU monitors the compressor circuit for abnormalities.

DTC DETECTION CONDITION TABLE

HINT

Once the ECU stores DTC C1742/42 in the memory, the vehicle height control is not carried out until the normal signal is input to the ECU from the compressor motor. However, the control automatically resumes approx. 70 min. after the ignition switch is turned ON.

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1. CHECK DTC Check if the other DTC is recorded (See «DTC CHECK/CLEAR»(ref-280580-S29897921482008022200000) ). Result DTC RESULT REFERENCE TABLE Result Proceed to Other DTC Is not output. A Other DTC Is output. B B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC A: GO TO NEXT STEP
2. INSPECT HEIGHT CONTROL COMPRESSOR ASSEMBLY Disconnect the height control compressor assembly connector. Apply battery voltage between terminal 1 and 2 of the height control compressor assembly. Standard: Compressor motor operates. NOTE: Do not operate the height control compressor assembly 90 sec. or more. Since short and lock inside the height control compressor assembly causes enormous current to flow, stop the operation immediately when it dose not rotate. NG: REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR ASSEMBLY - SUSPENSION CONTROL ECU) Check for open and short circuit in the harness and the connector between the height control compressor assembly and the suspension control ECU (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR ASSEMBLY - AIR SUS RELAY) Check for open and short circuit in the harness and the connector between the height control compressor assembly and the AIR SUS relay (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
5. INSPECT HEIGHT CONTROL SOLENOID VALVE OR EXHAUST SOLENOID VALVE When using intelligent tester: Connect the intelligent tester to DLC3. Turn the ignition switch ON, and push the intelligent tester main switch ON. Select the item "LEVEL SOL REAR", "GATE SOL REAR", "LOW PRS TNK SOL", "EXHAUST SOL", in the ACTIVE TEST, and operate it with the intelligent tester. Check whether the solenoid makes sound. Check whether the height control solenoid valve has a continuity (will vibrate). OK: The solenoid makes sound, the height control solenoid valve has a continuity (will vibrate). When not using intelligent tester: Disconnect the valve connector. Check the operating sound of the valves when battery positive voltage is applied to the terminals as shown below. SOLENOID VALVE REFERENCE TABLE Solenoid valve Battery positive Battery negative Gate solenoid valve 1 2 Leveling solenoid valve 3 2 Exhaust solenoid valve 1 2 Tank solenoid valve 2 1 OK: It should make an operating sound (click). HINT: When a malfunction is found in the gate solenoid valve, the leveling valve or the tank solenoid valve, replace the height control reservoir assembly. When a malfunction is found in the exhaust solenoid valve, replace the height control compressor assembly. NG: REPLACE HEIGHT CONTROL RESERVOIR ASSEMBLY NG: REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY OK: GO TO NEXT STEP
6. CHECK AIR TUBE CLOGGED Check visually for clog, damage or breakage on the air tube (See «ON-VEHICLE INSPECTION»(ref-280580-S02778100062008022200000) ). NG: REPAIR OR REPLACE AIR TUBE OK: REPLACE SUSPENSION CONTROL ECU

DTC DETECTION CONDITION TABLE

If the vehicle height control is attempted on a steeply sloping road, when the vehicle is overloaded, or when the vehicle is jacked up with the engine running, the compressor motor operates continuously to raise vehicle height, and causes electric current to flow to the AIR SUS relay for 100 seconds or longer. Thus DTC C1751/51 may be output and vehicle height control may be suspended. (This is not electrically abnormal.) In this case, however, the vehicle height operation is resumed approx. 10 min. after the ignition switch is turned ON after the ECU detects the first error. If ECU detects another error, it takes 70 minutes until control is resumed.

DTC DETECTION CONDITION TABLE

When turning the ignition switch to the ON position, the battery positive voltage is input to terminal B and IG of the suspension control ECU. By turning the ignition switch to OFF, the supply of the battery positive voltage to terminal B and IG terminals stops, and the power is turned OFF.

DTC DETECTION CONDITION TABLE

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1. INSPECT SOURCE VOLTAGE Check the battery voltage. Standard voltage: 11 to 14 V HINT: Start the inspection from step 2 when using the intelligent tester, and start from step 3 when not using the intelligent tester. NG: REPLACE BATTERY OK: GO TO NEXT STEP
2. INSPECT FUSE (AIR SUS NO. 2) Remove the AIR SUS No. 2 fuse from the engine room R/B. Measure the resistance of the AIR SUS No. 2 fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: GO TO NEXT STEP
3. INSPECT FUSE (ECU-IG) Remove the ECU-IG fuse from the driver side J/B. Measure the resistance of the ECU-IG fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: GO TO NEXT STEP
4. INSPECT SUSPENSION CONTROL ECU Remove the suspension control ECU with connectors still connected. Turn the ignition switch ON, and measure voltage between terminal S14-6 (B) and S15-1 (GND) and between terminal S14-6 (B) and S14-5 (GND2) of the suspension control ECU connector. Standard voltage: 10 to 14 V Turn the ignition switch ON, measure voltage between terminals S15-10 (IG) and S15-1 (GND) and between terminals S15-10 (IG) and S14-5 (GND2) of the suspension control ECU connector. Standard voltage: 10 to 14 V OK: REPLACE SUSPENSION CONTROL ECU NG: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - BODY GROUND) Disconnect the suspension control ECU connectors. Turn the ignition switch ON and measure the resistance between terminal S15-1 (GND) and body ground and between terminal S14-5 (GND2) and body ground. Standard resistance: Below 1 ohms HINT: OK: Repair or replace the harness or the connector between the AIR SUS fuse and the suspension control ECU and/or the ECU-IG fuse and the suspension control ECU. NG: Repair or replace the harness or the connector between the suspension control ECU and body ground. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SUSPENSION CONTROL ECU

The speed sensor detects the wheel speed and transmits the appropriate vehicle speed signal to the suspension control ECU through the skid control ECU.

DTC DETECTION CONDITION TABLE

HINT

When DTC C1794/94 and C1795/95 are output, follow the same procedure as DTC C1776/76.

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The suspension control ECU receives the engine speed signal from ECM.

DTC DETECTION CONDITION TABLE

HINT

When DTC C1797/97 is output, follow the same procedure as that of DTC C1779/79.

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1. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - ECM) Check for open and short circuit in the harness and the connector between the suspension control ECU and ECM (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
2. INSPECT ECM (TACH SIGNAL) Remove the ECM with connectors being connected. Turn the ignition switch ON. Connect an oscilloscope to terminals E7-1 (TACH) and E6-1 (E1) of the ECM harness side connector. With the engine idling, check the signal waveform. Standard: Signal waveform appears (Scheme 35) HINT: As the engine speed becomes higher, the waveform cycle gets shorter. NG: REPLACE ECM OK: REPLACE SUSPENSION CONTROL ECU

When the brake pedal is depressed, the stop light comes on and the signal is input to the STP terminal of the suspension control ECU.

HINT

This DTC is output only when the sensor signal check is done.

DTC DETECTION CONDITION TABLE

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1. INSPECT STOP LIGHT Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released. OK: Stop light operates normally. NG: Go to step 3 OK: GO TO NEXT STEP
2. INSPECT SUSPENSION CONTROL ECU Remove the suspension control ECU with connectors still connected. Measure the voltage between terminal S14-12 (STP) of the suspension control ECU and body ground when the stop light switch is ON and OFF. Standard voltage SUSPENSION CONTROL ECU Switch condition Specified condition Brake pedal depressed (ON) 10 to 14 V Brake pedal released (OFF) Below 1 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SUSPENSION CONTROL ECU
3. INSPECT STOP LIGHT SWITCH Disconnect the stop light switch assembly connector. Check resistance between terminals 1 and 2 of the stop light switch assembly. Standard resistance STOP LIGHT SWITCH Switch condition Tester connection Specified condition Switch pin free 1-2 Below 1 ohms Switch pin pushed in 1-2 10 kohms or higher NG: REPLACE STOP LIGHT SWITCH OK: GO TO NEXT STEP
4. INSPECT SUSPENSION CONTROL ECU Remove the suspension control ECU with connectors still connected. Measure the voltage between terminal S14-12 (STP) of the suspension control ECU and body ground when the stop light switch is ON and OFF. Standard voltage SUSPENSION CONTROL ECU Switch condition Specified condition Brake pedal depressed (ON) 10 to 14 V Brake pedal released (OFF) Below 1 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SUSPENSION CONTROL ECU

The door courtesy light switch turns on when the door is opened and turns off when the door is closed. The signal is sent from the body ECU and the back door ECU into the DOOR terminal of the suspension control ECU when all the doors are open.

DTC DETECTION CONDITION TABLE

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1. INSPECT COURTESY LIGHT SWITCH Check that the open door warning light comes on when any door or back door is opened and goes off when all the doors are closed. OK: Courtesy light operates normally. NG: CHECK OPEN DOOR WARNING LIGHT OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - BODY ECU) Check for open and short circuit in the harness and the connector between the suspension control ECU and the body ECU (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT BODY ECU (ACTY OUTPUT) Remove the body ECU with connectors still connected. Measure the voltage between terminal B5-20 (ACTY) of the body ECU and body ground when door is opened and closed. Standard voltage BODY ECU (ACTY OUTPUT) Door condition Specified condition Each door opened Below 1.5 V All doors closed 10 to 14 V NG: REPLACE BODY ECU OK: REPLACE SUSPENSION CONTROL ECU

Vehicle height can be chosen by pressing the height control switch.

By pressing the "UP" side, vehicle height goes up.

By pressing the "DOWN" side, vehicle height goes down.

DTC DETECTION CONDITION TABLE

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Height control can be operated or suspended by pressing the height control OFF switch.

By pressing the switch once, height control can be suspended.

By pressing the switch one more time, height control can be operated.

DTC DETECTION CONDITION TABLE

Scheme 42

The height control indicator light indicates the target height, not the actual height.

It blinks when the height control is operated by pressing the height control switch and stays on when the operation is completed.

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If the suspension control ECU detects a problem, the height control OFF indicator light comes on while suspending the height control function at the same time. At the same time, the suspension control ECU records a DTC in the memory.

Connect terminals TC and CG of the DLC3 to make the height control manual indicator light blink and output DTCs.

DTC is output when there is a short circuit between terminals TC and CG of DLC3.

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1. CHECK DLC3 TERMINAL VOLTAGE (TC TERMINAL) Turn the ignition switch to the ON position. Measure voltage between terminals TC and CG of DLC3. Standard voltage: 10 to 14 V OK: Go to step 3 NG: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Check for open and short circuit in the harness and the connector between terminal CG of DLC3 and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (DLC3 - SUSPENSION CONTROL ECU) Check for open and short circuit in the harness and the connector between terminal TC of DLC3 and the suspension control ECU (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SUSPENSION CONTROL ECU

After making short circuit between terminal TS and CG of DLC3 with the ignition switch is turned to the OFF position, the mode will change from normal mode to test mode when the ignition switch is turned to the ON position, and then DTC is output. After the ignition switch is turned to the ON position, there will be DTC output.

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1. CHECK DLC3 TERMINAL VOLTAGE (TS TERMINAL) Turn the ignition switch to the ON position. Measure voltage between terminals TS and CG of DLC3. Standard voltage: 10 to 14 V OK: Go to step 3 NG: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Check for open and short circuit in the harness and the connector between terminal CG of DLC3 and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (DLC3 - SUSPENSION CONTROL ECU) Check for open and short circuit in the harness and the connector between terminal TS of DLC3 and the suspension control ECU (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SUSPENSION CONTROL ECU

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1. REMOVE REAR DISC WHEEL
2. REMOVE QUARTER PANEL MUDGUARD SUB-ASSEMBLY REAR LH
3. REMOVE REAR BUMPER (See «REMOVAL»(ref-280581-S06540693112008022200000) )
4. REMOVE FUEL TANK FILLER PIPE PROTECTOR Remove the 4 clips and the fuel tank filler pipe protector.
5. REMOVE SPARE DISC WHEEL
6. REMOVE HEIGHT CONTROL COMPRESSOR COVER Remove the 3 clips and the height control compressor cover.
7. REMOVE HEIGHT CONTROL FILTER Disconnect the 2 clips and the 2 hoses. Remove the 2 bolts and the height control filter.
8. DISCONNECT HEIGHT CONTROL TUBE NO. 2 Remove the holder. Spread the clip and slowly pull the height control tube No. 2 straight out. NOTE: Do not remove the clip from the union except when replacing it. Remove the 2 O-rings.
9. REMOVE HEIGHT CONTROL COMPRESSOR ASSEMBLY Disconnect the connector. Remove the 3 clamps. Remove the 3 bolts. Disconnect the clip and remove the No. 1 hose. Remove the 3 bolts, the height control compressor and the dryer with the bracket. Remove the bolt, the dryer and the O-ring. Remove the 3 bushings from the height control compressor assembly.

See also:
• REMOVAL