2581Turn the ignition switch to LOCK.
2Loosen the negative terminal cable from the battery and wait for over 1 minute.
3Remove the glove box.
4Loosen the passenger airbag assembly connectors.
5Is the connector of the passenger airbag assembly normal?
Normal: [DTC of present trouble]
Continue with next step.
[DTC of past trouble]
Continue with next step.
Abnormal: replace the wire harness.
(3) Ascertain the trouble exists in passenger airbag assembly or other part
1Connect a new assembly to terminals A and B of the connector of passenger airbag assembly.
2Connect the negative (-) terminal cable of the battery.
3Turn the ignition switch ON.
4Any DTC displayed? Can it be cleared?
No: continue with next step.
Yes: replace passenger airbag assembly
See SRS- Passenger Airbag Assembly, Removal & Installation.
(4) Check the wire harness between passenger airbag assembly and SRS ECU
1Turn the ignition switch to LOCK.
2Loosen the negative (-) terminal cable from the battery and wait for over 1 minute.
3Remove steering column hood.
4Loosen the connector of the clock spring.
5Loosen the connectors of driver and passenger airbag assemblies.
6Remove left trim plate.
7Loosen all the SRS unit connectors.
8Check the circuit between the connector terminals of the SRS ECU and that of passenger airbag assembly
and the circuit between the connector terminal of the SRS unit and that of passenger airbag assembly for
the following:
yGround.
yShort circuit with power source.
yOpen circuit.
9Are the above-mentioned wire harnesses normal?
Normal: completion of trouble diagnosis.
Abnormal: replace the related wire harness.
262Section 3 Removal & InstallationI. SRS ELECTRONICAL CONTROL UNIT (ECU)1. Operations prior to Removal
(1) Turn the ignition switch OFF.
(2) Remove negative (-) terminal cable of the battery. Put it in a proper position or wrap it up with insulating
tape.
2. Removal procedures:
(1) Remove the central passage side cover plate (or remove auxiliary console).
(2) Remove the connectors to SRS ECU.
(3) Remove ECU.
3. Installation procedures:
(1) Install ECU.
(2) Install the connectors to SRS ECU.
(3) Install the central passage side cover plate (or install auxiliary console).
(4) Connect negative (-) terminal cable of the battery.
4. Key points for Installation:
(1) Install ECU.
(2) Check after installation.
1Turn the ignition switch ON.
2The warning light goes on within 6s, and then goes out.
(3) If the light doesn't go out, check the trouble and eliminate it.NOTICE1. Work must be started 60s after the negative (-) terminal cable is detached from battery. The detachednegative (-) terminal cable shall be protected with insulating tape for insulation.
2. Never attempt to dismantle or repair an ECU. If there is any trouble, replace the ECU with a new one.
3. Prevent the ECU from shock or vibration. If pitting, crack or distortion is found, replace the ECU with
a new one.
4. Every time an airbag is deployed, the ECU shall be replaced with a new one.
5. When disassembling or maintaining the parts around ECU, attention must be given to avoid contacting
the ECU.NOTICE
If the ECU cannot be installed correctly, the airbag will not act normally.
2635. Check:
1 ECU case for pitting, crack and distortion.
2 The joint for damage and distortion.
For other ECU checkings, see Troubleshooting.II. AIRBAG ASSEMBLY & CLOCK SPRING1. Operations prior to removal
(1) Take out the ignition key after the steering wheel and front wheel are adjusted to straightforward direction.
(2) Remove negative (-) terminal cable from the battery.
2. Removal procedures of the driver airbag assembly:
(1) Unscrew the screws of the two sides.
(2) Disconnect the connector of the wire harness.
(3) Remove the components of airbag assembly.
(4) Remove steering wheel.
3. Removal procedures of clock spring:
(1) Remove the driver airbag assembly (disconnect the connector).
(2) Remove steering wheel gently (see the precautions).
(3) Open the upper closure of the combination switch, locate and
disconnect the connector of wire harness in the lower end.
(4) Remove clock spring from the steering wheel.
4. Installation procedures of the driver airbag assembly
(1) Pre-Check
ySteering wheel
yConnect the wire harness
yDriver airbag assembly
(2) Screw up the installation screws of the two sides.
(3) Connection of the negative (-) terminal of the battery
(4) Check after installation.NOTICE
If pitting, crack or distortion is found on an ECU, replace it with a new one.NOTICE
Put the removed driver airbag
assembly upside down in a clean
and dry place for care.NOTICE
Put the removed clock spring in
a clean and dry place for care.
265III. KEY POINTS FOR INSTALLATION1. Pre-Check
(1) The new airbag or clock spring shall be checked before being installed.
(2) Connect negative (-) terminal cable of the battery.
(3) Connect Hi-DS T to the diagnostic interface (16 connector).
(4) Turn the ignition switch ON.
(5) Read the diagnostic circuit and see if the other locations than the troubled area of the airbag are normal.
(6) Turn the ignition switch ON.
(7) Remove the negative (-) terminal cable from the battery, and protect it with insulating tape for insulation.
2. Installation of clock spring: align the clock spring and install it to the
steering wheel.
yCenter alignment of the clock spring
Screw up the clock spring clockwise to the end, rotate it counterclock-
wise by 2.5 turns, and align it with the mark (see the figure below).
3. Install the components of the steering wheel and airbag assembly
(1) When the center of the clock spring is aligned, install the components of the steering wheel and airbag
assembly.
(2) After being installed, rotate the left and right sides of the steering wheel to position, and make sure there
is no abnormality.NOTICEIn case of scrapping an airbag, it shall be noted that the airbag shall be deployed according to the specifiedprocedures before being scrapped.
When connecting or disconnecting the Hi-DS T, turn the ignition switch OFF first.NOTICE:
Work must be started 60s after the negative (-) terminal cable is disconnected from battery.NOTICE:
If the center of the clock spring cannot be aligned, the steering wheel
will not turn midway, or cause bad performance to the clock spring
circuit, consequently hamper the normal action of the airbag.NOTICEWhen installing the components of the steering wheel and airbag assembly, attention should be given toprotect the wire harness of the clock spring from seizure.
2664. Check after installation
(1) Slightly rotate the steering wheel left and right, make sure that there is no abnormality or noise. (Driver
airbag module, clock spring)
(2) Turn the ignition switch ON.
(3) The warning light goes on within 6s, and then goes out.
(4) The trouble shall be eliminated if the warning light remains on when the ignition switch is turned on or
after it goes out after 6s.IV. CHECKING1. Driver airbag assembly checking
Check the following items and replace the related components of the airbag assembly if any badness is
found. The old components shall be deployed before scrapping.
(1) Check the hood for pitting, crack, distortion, etc.
(2) Check the joint of the wire harness for damage and the terminal for distortion.
(3) Check the case of the gas generator for pitting, crack and distortion.
(4) Check the installation status of the airbag assembly.
2. Check the clock spring
Check the following items, and replace the clock spring if any badness is found.
(1) Check the joint and protecting tube for damage and the terminal for distortion.
(2) Check the case for damage.
(3) Check and see if the joint terminal at the upper end of the clock spring are in conduction with that at the
lower end.
(4) A thin probe shall be inserted from the back of the yellow connector of the clock spring.NOTICE
If there is pitting, crack or distortion, replace the airbag assembly with new one. The old components of the
airbag shall be deployed before scrapping.
The circuit resistance of the airbag assembly (squib) cannot be measured even with a designated tester.Since there is current flowing in the squib, when a tester is involved in measuring the resistance, sometimesthe airbag is unexpectedly deployed in case of static electricity, leading to serious accident.
272Chapter 8 MK-20 ABS SystemSection 1 ABS DiagnosisI. Check the ABS Warning Light1. Check the ABS Warning Light goes on as the following:
1Turn the ignition switch to ON, the ABS Warning Light goes on for about 1.7 seconds and then goes off.
2If the above condition is not satisfied, it indicates that there is a fault, please check the DTC.
3If the warning light does not light up at all, refer to the Non-DTC fault inspection table.II. The Reading of the information statusAfter connecting the scan meter, turn the ignition switch to¡°ON¡±, select the function menu item 01, press
OK to confirm, the screen will display the following information:
1. ECU drawing number and its version:
ABS MK20 IE
2. Code 01901III. Read and Clear the DTC1. After selecting the "02 Read DTC" in the function menu, it displays the total amount of the fault, if there
is no DTC, then it displays no DTC. Then, press OK button to proceed to next page to review the DTC
and its description. Generally, there is a P or O before the DTC, indicating that it is a Persistent fault or
Occasional fault. Persistent fault remains existing all the time, while the Occasional fault can be cleared
and is only able to reoccur during the driving.
Note:
The reading of the DTC can not be quitted middle way, you can return to the function menu only
after reading all the DTC.
Clear DTC
2. Select function menu item 05, press OK button to clear the DTC, if the DTC can not be cleared, it
indicates that the DTC represent exist all the time, if the saved DTC can be cleared, it indicates that it is
occasional fault can only be detected during the driving.
274VI. Troubleshooting Quick Index
VII. Non-DTC Problem Inspection Table IndexDTC Fault Description Diagnosis ResultInspection
Table No.Reference
Page
65535 ECU Da ma ge d
1276 ABS hydraulic pump Motor c a n not ope ra te 1 275
283 LF Whe e l Sensor 276
285 RF Whee l Se nsor 277
290 LR Whe el Se nsor 278
287 RR Whe e l Se nsor
1044 ABS progra mming e rror 5 279
668 P ower supply te rmina l 30 6 280
1130 Abnorma l ABS ope ra tion Signa l is not as spe cifie d 7 281Electrical or mechanicalfault2,3,4Inspection
Table No.Reference
Page
1282
2283
The bra ke forc e on both s ide s is not uniformThe brake force is insufficientABS operate s whe n the bra ke pe dal is slightly
depre ssed(vehicle is stationary)
ABS operate s whe n the bra ke pe dal is slightly
depre ssed(ve hic le is driving)
Whe n the ABS ope ra tes, the bra ke pe dal vibrate s
severely
4285
5286
6287 No DTC output(
failure in communicating with the scan meter) Fault Status
Turn the ignition switc h to “ON” (With engine off), ABS Wa rning
Light doe s not go on
Afte r the e ngine is sta rte d, the wa rning light doe s not go off
ABS
abnormal284 3
Brake peda l stroke is exc e ssive ly long
You ne ed to he a vily depre ss the brake peda l
276Section 2 ABS System CheckI. DTC Problem Inspection TableNote: If the Battery is excessively discharged, the motor will not be driven, therefore you must
check that the battery voltage is normal before performing the motor driving test. The vehicle
must be stationary during the test. 1 DTC 01276 Like ly Causes
[De s cription]
When the vehicle speed exceeds
20km/h, A BS EC U de te c ts tha t the motor c a n not
ope ra te normally and re c ord this D TC.
[Hint]
Whe n this proble m oc c urs, one of the
possible causes is that the wire harness between
the motor and the ECU is disconnected. Use the
sc a n me te r to pe rform the te st by a c tiva ting the
H CU func tion to drive the motor. z P ow e r supply is disc onnec ted or grounde d z Motor w ire ha rne ss is disc onnec te d z Motor is da ma ge dRemove the motor wire harness connector, connect
it to the Battery to see whether the motor operates?Check the fuse and ABS ECU connectorConnect the motor wire harness connectorTurn the
ignition switch to ONClear the DTC Use the scan
meter to Perform the HCU diagnosistor
Turn the ignition switch to ONDoes the fault reoccur?Refer to “Occasional Problem Service Key Point” Normal
Normal
NoAbn.
Abn.
Ye sReplace the HCU
Replace the fuse or wire harness
Replace the ECU