General Information - Repair Instruction1-93. Electronic Control Device
(1) Removal of the battery terminal cable
a. Before performing electrical servicing, disconnect the nega-
tive (-) cable from the battery in order to avoid short for burnout.
b. When disconnecting the terminal cable, turn off the ignition
and light switches, loosen the cable nut and raise the cable straight
up without twisting or prying it.
c. When disconnecting the terminal cable from the battery, all
information stored in the clock, radio and DTC shall be deleted,
therefore, these information shall be checked before disconnection.
(2) Processing of Electronic Parts
a. Do not open the cover or case of the ECU unless absolutely
necessary. (If the IC terminals are touched, the IC may be destroyed
by static electricity.)
b. To pull apart electrical connectors, pull on the connector itself,
not the wires.
c. Be careful not to drop electrical components, such as ECU
or relays. If they are dropped on a hard floor, they should be replaced
and not reused.
d. When steam cleaning an engine, protect the electronic
components, air filter and emission-related components from water.
e. Never use an impact wrench to remove or install tempera-
ture switches or temperature sensors.
f. When checking continuity at the wire connector, insert the
tester probe carefully to prevent terminals from bending.
4. Remove and Installation of Engine Intake Parts
(1) If any metal scrap is mixed in the inlet pass, that may give
a bad effect to the engine.
(2) When removing and installing of the inlet system parts, close (6) Airbag ECU
a. Never reuse the airbag ECU involved in a collision when the SRS has deployed.
b. The connectors to the airbag sensor assembly should be connected or disconnected with the airbag ECU
mounted on the floor. If the connectors are connected or disconnected while the airbag ECU is not mounted to
the floor, it could cause undesired inflation of the supplemental restraint system.
c. Work must be started after 60 seconds from the time the ignition switch is turned to the "LOCK" position
and the negative (-) terminal cable is disconnected from the battery, even if only loosing the set bolts of the
airbag ECU.
(7) Wire Harness and Connector
The SRS wire harness is integrated with the instrument panel wire harness assembly. All the connectors in
the system are a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes
broken due to an accident, etc., repair or replace it.Negative(-)
Cable
Wrong
Adjust seat back angle
Move seat forward or backward angleUsage and Maintenance of MK Series - Usage of MK Series2-7212.How to use ignition switch
(1) LOCK when key is at this position, it can be pulled out and inserted in easily. The function of this position
is to lock steering wheel. If the key cannot be turned from LOCK to ACC, please rotate the steering wheel slightly
while turning the ignition key.
(2) ACC radio and cigarette lighter is turned on when key is at this position.
(3) ON when key is at this position, the following indicator is on: battery charging, ABS, brake fluid level,
park brake, engine coolant temperature, engine MIL, airbag oil pressure.
(4) START Turn the key to this position to start the engine. When engine is started, release the key
immediately. It returns to ON automatically. When engine is on, do not turn the key to this position.
Notice:
(1) Do not pull the key out or turn it to LOCK before the car is fully stopped, or there will be dangers caused
by locking steering wheel or disabling some safety functions.
(2) It is prohibited to drive the car with engine turned off to ensure functioning of braking and steering booster.
(3) Do not let the key stay at ON for a long time when engine is off, or the battery fully discharged.
(4) Shift to neutral gear before ignition key is switched to START.
(5) Turn the steering wheel lightly after the car is fully stopped to make sure it is locked.
3.Unlock Steering Wheel
How to unlock steering wheel: insert ignition key, turn the steering wheel lightly and switch the ignition key.
Steering wheel is unlocked.
4.Adjust seat position
Seat back angle and cushion angle of front seats in MK-1 sedan can be adjusted.
(1) Adjust seat back angle
Turn around adjusting handle, and adjust seat back to appro
priate position.
(2) Move seat forward or backward
Steps:
a. pull adjusting handler up
b. Move the seat forward or backward, and adjust the seat to
appropriate position.
c. Put the handler down and move the seat again till it is
locked.
Attention: adjust the seat only when the car is fully stopped
to ensure safety.
(3) Front head rest can be adjusted in two ways.
Push the head rest from back to front, there are three fixed
positions to lock.If pushed over the final locking position,the
head rest can return to the original position after hand
withdraws.
(4) Fold Rear Row Seat
The seat back can be tilted forward so that the trunk will be
used to the last degree.
a. Remove the head rest
b. Unlock the seatback and fold it down.
Split seatback can be folded separately on demand.
Instrument Designation Usage
Diagnostic detector (Hi-DS T Scan meter)
Special diagnostic meterCheck system troubles of the SRS,
and clear the DTC of ECUIII. Troubleshooting1. Basic process of trouble diagnosis
DTC of the present fault may coexist with that of the history fault.
Notice:
After the new SRS ECU is installed, the warning light of the SRS, with the ignition switch ON, will be on
for 4s and then go out permanently, indicating SRS works normal. In this case, no service is needed. Otherwise,
system diagnosis and service shall be carried out.
If with the ignition switch ON, the warning light of the SRS is not on, the relevant circuits of the warning
light shall be serviced. Then go on with the operation and enable it to work.SRS (Supplemental Restraint System)-
SRS-General Information5-55order to deploy an airbag within a certain time period after the battery
is disconnected, condenser in the ECU shall retain some electrical
energy. Otherwise, it could lead to a serious accident because of the
unexpected deployment of airbag.
6. During spray paint work, ECU, airbag assembly, clock
springassembly, etc shall be removed and kept in place to avoid the
effects of overheat. (Over 93)
7. When the SRS is serviced, a diagnostic scan meter is used to clear
the DTC to enable the normal work ofthe warning light.II. Test instrumentWarning light con-
stantly goes onuse scanner find out the troubletroubleshootingtrouble eliminated Check SRS warning light (see the right figure)
(1) Turn the ignition switch ON and find out whether the warning
light is on.
(2) 4 seconds after the process of ON-OFF, confirm that the
warning light goes out permanently.
(3) Otherwise, diagnosis and checking have to be involved in.
2. System Diagnosis
The SRS ECU will perform a series of circular diagnostic tests to check the readiness of the SRS functions.
This test can avoid unexpected explosion of the restrain system and in the same time ensure the necessary explosion
in a crash. If a trouble is detected, the SRS ECU will store a proper DTC and turn on the warning light indicating
a trouble for service.SRS Air Bag
Warning LightBattery
Cable Insulation BandSRS Air Bag
Warning Light
No. Problem Description DTC Code
1 There are problems in the Airbag ECU 93C1
2 The power supply voltage of the Airbag ECU is too high 93C2
3 The power supply voltage of the Airbag ECU is too low 93C3
4 The drive side airbag module resistance is too high 93C4
5 The drive side airbag module resistance is too low 93C5
6 The drive side airbag module is short to ground 93C6
7 The drive side airbag module is short to power supply 93C7
8 The passenger side airbag module resistance is too high 93C8
9 The passenger side airbag module resistance is too low 93C9
10 The passenger side airbag module is short to ground 93CA
11 The passenger side airbag module is short to power supply 93CB
12 The driver side pretensioner seat belt resistance is too high 93CC
13 The driver side pretensioner seat belt resistance is too low 93CD
14 The driver side pretensioner seat belt resistance is short to ground 93CE
15 The driver side pretensioner seat belt resistance is short to power supply 93CF
16 The passenger side pretensioner seat belt resistance is too high 93D0
17 The passenger side pretensioner seat belt resistance is too low 93D1
18 The passenger side pretensioner seat belt resistance is short to ground 93D2
19 The passenger side pretensioner seat belt resistance is short to power supply 93D3
20Airbag ECU warning light is short to ground or warning light wire harness is disconnected93D4
21 Airbag ECU warning light is short to power supply 93D5
22 There are problems in the configuration of the airbag ECU 93D6
23The impact signal output interface of the airbag ECU is short to ground or the impact
93D7
output circuit is disconnected.
(1) The airbag controller has internal problem (DTC 93C1): when using diagnostic scan tool to test the airbag
controller, if the DTC code is 93C1, it indicates that there are problems in the controller.5-563. Trouble Identification
Trouble Record (DTC storage)
Each DTC consists of two bytes, indicating current problem or occurred problem. 93CX or 93DX indicates
current problem while 938X or 939X indicates occurred problem. Current problem can not be cancelled, even if
it is cancelled at that time, it will reoccur after initialization or a cycle of self-check. You have to make analysis
on the causes and perform troubleshooting.
The DTC is transmitted by the diagnostic scan tool instructed by ECU through the serial data interface of the
program.
Step Operation Yes No
1 When using the scan tool to test the controller, is the DTC 93C1? Go to step 2 other
2 Use new controller to replace faulty controller Go to step 3
3 After the ignition switch is closed, the warning light shall goes off. Go to step 4 Go to step 1
4 The fault has been removed, use the scan tool to eliminate the DTC.SRS (Supplemental Restraint System)-SRS-General Information
(2) The power supply voltage is too high (DTC 93C2)
When using the scan tool to test the airbag ECU, the DTC is 93C2, indicating that the airbag ECU power supply
voltage is too high, the voltage is higher than 18V.
Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C3? Go to step 2 other
2Shut off the power supply, check whether the power supply voltage is low?Go to step 4 Go to step 3
3 Go to step 4
4 Go to step 5 Go to step 1
5 The fault has been removed, use the scan tool to eliminate the DTC.
(3) The power supply voltage is too low (DTC 93C3)
When using the scan tool to test the airbag ECU, the DTC is 93C3, indicating that the airbag ECU power supply
voltage is too low, the voltage is lower than 8.5V.
(4) The drive side airbag module resistance is too high (DTC 93C4)5-57Analyze the causes of low power supply voltage, check whether the power
supply of the airbag ECU is low? (check the connection of the wire harness)
After the troubleshooting, switch on the power supply,observe the status of
the warning light. The warning light shall goes off after lighting up for 4
seconds (self-check).Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C4? Go to step 2 other
2 Go to step 3 Go to step 6
3 Go to step 4 Go to step 6
4 Whether the driver side front airbag module resistance is ok? Go to step 5 Go to step 6
5 Whether the clock spring is ok? Go to step 6
6 Go to step 7 Go to step 1
7 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector of the airbag
controller is well plugged (whether the wire harness connector is in good
condition)?
Disconnect the battery negative cable for 30 seconds, check whether the
driver side front airbag module is well connected? Whether the clock spring
is well connected? (whether the wire harness connector is in good condition)
After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check).Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C2? Go to step 2 other
2Shut off the power supply, check whether the power supply voltage is high?Go to step 4 Go to step 3
3 Check the connection of the airbag ECU power supply wire harness. Go to step 4
4 Go to step 5 Go to step 1
5 The fault has been removed, use the scan tool to eliminate the DTC.After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check).SRS (Supplemental Restraint System)-SRS-General Information
When using the scan tool to test the airbag ECU, the DTC is 93C4, indicating that the driver side front airbag
module resistance is too high, the resistance is higher than 7.0 ohm.
(5) The drive side airbag module resistance is too low (DTC 93C5)
When using the scan tool to test the airbag ECU, the DTC is 93C5, indicating that the driver side airbag module
resistance is too low, the resistance is lower than 2.1 ohm.
Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C5? Go to step 2 other
2 Go to step 3 Go to step 6
3 Go to step 4 Go to step 6
4 Whether the driver side airbag module resistance is ok? Go to step 5 Go to step 6
5 Whether the clock spring is ok? Go to step 6
6 Go to step 7 Go to step 1
7 The fault has been removed, use the scan tool to eliminate the DTC.
(6) The drive side airbag module is short to ground (DTC 93C6)
When using the scan tool to test the airbag ECU, the DTC is 93C6, indicating that the driver side airbag module
is short to ground, the resistance is lower than 6.5K ohm.5-58Shut off the power supply, check whether the connector of the airbag
controller is well plugged (whether the wire harness connector is in good
condition)?
Disconnect the battery negative cable for 30 seconds, check whether the
driver side front airbag module is well connected? Whether the clock spring
is well connected? (whether the wire harness connector is in good condition)
After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check).Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C6? Go to step 2 other
2 Go to step 3 Go to step 5
3 Go to step 4 Go to step 5
4 Whether the clock spring is ok? Go to step 5
5 Go to step 6 Go to step 1
6 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector wire harness of
the airbag ECU is in good condition?
Disconnect the battery negative cable for 60 seconds, check whether the
connector wire harness of driver side airbag module is in good condition?
After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check). (7) The drive side airbag module is short to power supply (DTC 93C7)
When using the scan tool to test the airbag ECU, the DTC is 93C7, indicating that the driver side airbag module
is short to power supply, the resistance is lower than 21K ohm.SRS (Supplemental Restraint System)-SRS-General Information
(9) The passenger side airbag module resistance is too low
When using the scan tool to test the airbag ECU, the DTC is 93C9, indicating that the passenger side airbag
module resistance is too low, the resistance is lower than 1.2 ohm.5-59Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C7? Go to step 2 other
2 Go to step 3 Go to step 5
3 Go to step 4 Go to step 5
4 Whether the clock spring is ok? Go to step 5
5 Go to step 6 Go to step 1
6 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector wire harness of
the airbag ECU is in good condition?
Disconnect the battery negative cable for 30 seconds, check whether the
connector wire harness of driver side airbag module is in good condition?After the troubleshooting, switch on the power supply, observe the status of the warning
light. The warning light shall goes off after lighting up for 4 seconds (self-check). (8) The passenger side airbag module resistance is too high (DTC 93C8)
When using the scan tool to test the airbag ECU, the DTC is 93C8, indicating that the passenger side airbag
module resistance is too high, the resistance is higher than 4.5 ohm.
Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C8? Go to step 2 other
2 Go to step 3 Go to step 5
3 Go to step 4 Go to step 5
4 Whether the passenger side airbag module resistance is ok? Go to step 5
5 Go to step 6 Go to step 1
6 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector of the airbag ECU
is well plugged (whether the wire harness connector is in good condition)?
Disconnect the battery negative cable for 30 seconds, check whether the
passenger side airbag module is well connected? (whether the wire
harness connector is in good condition)After the troubleshooting, switch on the power supply, observe the status of the warning
light. The warning light shall goes off after lighting up for 4 seconds (self-check).Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93C9? Go to step 2 other
2 Go to step 3 Go to step 5
3 Go to step 4 Go to step 5
4 Whether the passenger side airbag module resistance is ok? Go to step 5
5 Go to step 6 Go to step 1
6 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector of the airbag ECU
is well plugged (whether the wire harness connector is in good condition)?
Disconnect the battery negative cable for 30 seconds, check whether the
passenger side airbag module is well connected? (whether the wire
harness connector is in good condition)After the troubleshooting, switch on the power supply, observe the status of the warning
light. The warning light shall goes off after lighting up for 4 seconds (self-check).SRS (Supplemental Restraint System)-
SRS-General Information
(11) The passenger side airbag module is short to power supply (DTC 93CB)
When using the scan tool to test the airbag ECU, the DTC is 93CB, indicating that the passenger side airbag
module is short to power supply, the resistance is lower than 21K ohm.
(12) The driver side pretensioner seat belt resistance is too high (DTC 93CC)
When using the scan tool to test the airbag ECU, the DTC is 93CC, indicating that the driver side pretensioner
seat belt resistance is too high, the resistance is higher than 4.5 ohm.
(13) The driver side pretensioner seat belt resistance is too low (DTC 93CD)
When using the scan tool to test the airbag ECU, the DTC is 93CD, indicating that the driver side pretensioner
seat belt resistance is too low, the resistance is lower than 1.2 ohm.
(14) The driver side pretensioner seat belt resistance is short to ground (DTC 93CE)
When using the scan tool to test the airbag ECU, the DTC is 93CE, indicating that the driver side pretensioner
seat belt is short to ground, the resistance is lower than 6.5K ohm.
(15) The driver side pretensioner seat belt resistance is short to power supply (DTC 93CF)
When using the scan tool to test the airbag ECU, the DTC is 93CF, indicating that the driver side pretensioner
seat belt is short to power supply, the resistance is lower than 21K ohm.5-60 (10) The passenger side airbag module is short to ground
When using the scan tool to test the airbag ECU, the DTC is 93CA, indicating that the passenger side airbag
module is short to ground, the resistance is lower than 6.5K ohm.
Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93CA? Go to step 2 other
2 Go to step 3 Go to step 5
3 Go to step 4 Go to step 5
4 Whether the passenger side airbag module resistance is ok? Go to step 5
5 Go to step 6 Go to step 1
6 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector wire harness of
the airbag ECU is in good condition?Disconnect the battery negative cable for 30 seconds, check whether the
connector wire harness of passenger side airbag module is in good condition?After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check).Step Operation Yes No
1 When using the scan tool to test the airbag ECU, is the DTC 93CB? Go to step 2 other
2 Go to step 3 Go to step 4
3Go to step 4
4 Go to step 5 Go to step 1
5 The fault has been removed, use the scan tool to eliminate the DTC.Shut off the power supply, check whether the connector wire harness of
the airbag ECU is in good condition?Disconnect the battery negative cable for 30 seconds, check whether the
connector wire harness of passenger side airbag module is in good condition?After the troubleshooting, switch on the power supply, observe the status
of the warning light. The warning light shall goes off after lighting up for
4 seconds (self-check).SRS (Supplemental Restraint System)-SRS-General Information