ECU GEELY CK 2008 Service Manual

252(3)Check the connection between ECU and instrument cluster
1Turn the ignition switch to LOCK.
2Disconnect the negative (-) terminal cable from the battery.
3Disconnect the connector of instrument cluster.
4Check if the related circuits of the warning light are connected or not.
Yes: continue with next step.
No: replace the wire harness, and then continue with step 5.
2. SRS warning light remains on.DIAGNOSTIC PROCEDURESTo begin the check, first use special diagnostic instruments and ECU to perform communication diagnosis
and find out the causes of the trouble. If the communication fails, continue with the following procedures:
(1) Check battery
1Check battery voltage.
2Is voltage higher than 9V?
Yes: continue with next step.
No: Insufficient battery supply. Check the charging/discharging system, and then continue with step (5).
(2) Check the continuity of the wire harness between ECU and instrument cluster
1Turn the ignition switch to LOCK.
2Disconnect negative (-) terminal cable from the battery.
3Open the guard plate of the central passage.
4Disconnect the connector of the instrument cluster.
5Connect the negative (-) terminal cable of the battery.
6Turn the ignition switch ON.
7Check whether the voltage of the connector terminal of the instrument is 12V (power supply and instrument
connecting wire).Trouble Che cking Sta tus P ossible Causez Insufficient battery supplyz ECU internal troublez SRS wa rning light trouble of instrument c luste rz Improper connection of ECU connectorz P oor c ontac t of instrume nt c luste r c onne c torz Ope n circ uit or poor c onta c t of ECU power supply fusez P oor c onne c tion of ECU connec tor te rmina lz P oor conta ct of the wire ha rne ss be twe en ECU
connec tor te rmina l a nd groundz Drive r or pa ssenge r side circ uit trouble of SRS SRS wa rning light
remains onSRS warning light
remains on

253Yes: continue with next step.
No: check the circuit, repair it and continue with step (5).
8Turn the ignition switch to LOCK.
9Check the continuity of the terminal of instrument connector and that of diagnostic interface (check the
two ends of K line).
Yes: continue with next step.
No: repair or replace the wire harness. Continue with step (5).
VMake sure to disconnect the negative terminal cable from the battery and wait for at least 60s.Disconnect
the ECU connector. 11Disconnect the connectors of the instrument cluster 12 Are the connector terminals 5, 7 and 9 and those of instrument cluster continuity?
Yes: continue with next step.
No: replace the wire harness, and then continue with step (5). 13Remove ECU and see whether the terminals are in good condition and whether the shorting bar is
broken.
Yes: replace the ECU.
No: reconnect the ECU connector, and then continue with next step.
(3) Make sure of the nonrecurrence of the trouble after repair
1Turn the ignition switch to LOCK.
2Disconnect the negative (-) terminal cable from the battery and wait for at least 60s.
3Connect all the ECU connectors.
4Connect the connector of driver airbag assembly.
5Connect the connector of passenger airbag assembly.
6Connect the connectors of driver and passenger seat belt pretensioners (vehicle with pretensioner).
7Connect clock spring connector.
8Connect the negative (-) terminal cable of the battery.
9Turn the ignition switch to ON.
VIs the SRS warning light working normal?
Yes: the trouble is eliminated. Explain the repair procedures to the Customer.
No: recheck symptoms of the trouble. Repeat these procedures from the first step if the trouble reoccurs.

2543.Internal trouble
4. Power troubleDIAGNOSTIC PROCEDURES(1) Check battery
yIs the battery voltage measured higher than 9V?
Yes: continue with next step.
No: low battery voltage, check the charging/discharging system.
ySee Chapter I, Charging System-Battery Checking
(2) Check the wire harness between battery and fuse box
yRemove fuse box and turn the ignition switch ON, without loosening connector.
yMeasure and see if the electrical potential between two terminals of the fuse box is more than 9V.
Yes: continue with next step.
No: check the wire harness.DTC B1620 Internal trouble of SRS unitCAUTION
●
Condition for running the DTC is to inspec t the dia gnostic trouble code that
ma y not a ppe a r prior to this te st. P e rforming this te st ma y re sults in body injury orda ma ge d system due to misoperations. The re fore , prepa ra tions must be ma debefore checking.
●
Internal circuit trouble of SRS ECU
P ossible Ca use Interna l trouble of SRS unit
Operation
Replace the SRS unit, see SRS System, Removal & Installation of SRS Unit Che c king ConditionsDTC B1112 Low power source voltage of SRS ECU
CAUTION
Condition for running the DTC is to inspe ct the diagnostic trouble c ode that ma y not
a ppea r prior to this test. P e rforming this te st ma y re sults in body injury or da ma ge dsyste m due to misoperations. Therefore, prepa ra tions must be ma de beforechecking.
●
The e lec tric a l pote ntia l be twe e n pins 5 a nd 6 of the c onne c tor of SRS unit is
le s s t ha n 9V .
●
Low batte ry volta ge
Trouble in wire ha rne ss betwe e n ba tte ry and SRS ECU C he c king C ondit ions
P os s ible C a us e

255(3) Check the wire harness between the fuse box and the connector of the SRS unit
CAUTION
If it is not handled properly, the airbag assembly may be triggered and deployed, leading to serious injury to a
person. Therefore, prior to handling, read the service cautions carefully. See service cautions for SRS.
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.
5Remove glove box (along with passenger airbag assembly)
6Loosen passenger airbag assembly connectors.
7Remove left trim plate.
8Loosen all the SRS unit connectors.
9Reconnect the negative (-) terminal cable of the battery and turn ignition switch ON, check whether the
electrical potential between pins 5 and 6 (ground) of the connector of SRS unit is higher than 9V.
Yes: continue with next step.
No: replace the wire harness.
VTurn the ignition switch to LOCK. 11 Loosen the negative (-) terminal cable from the battery and wait for over 1 minute. 12 Remove left trim plate. 13 Disconnect the adaptor connector of SRS unit. 14 Reconnect the battery negative (-) terminal cable and turn the ignition switch ON, check whether the
voltage between the corresponding pin of the connector and the pin (ground) is higher than 9V.
Yes: completion of trouble diagnosis.
No: replace the wire harness.
5. Driver side troubleDTC
B1 346
B1 347
B1 348
B1 349
CAUTION
● If it is not handled properly, the airbag assembly may be triggered and deployed,leading to s erious injury to a person. Therefore, prior to handling, read the service cautionscarefu lly .
See s erv ice cau t io n s fo r SRS
If there is driver airbag
● The resistance between terminals of the SRS unit connectors is out of range.
The wire harness of the driver airbag of SRS is short or open circuited.
● Driv er airb ag as s emb ly tro u ble.
● Clock spring internal trouble.
● Trouble of the connector of the circuit between clock spring and SRS ECU.
● The wire harness between clock spring and SRS ECU is open or short-circuited.
● In co rrect in s ert io n o f t h e co n n ect o r o f t h e d riv er airb ag g en erat o r o f SRS. Driver airbag trouble (high or low resistance, short circuit, ground, etc.)
Ch e c kin g Co n d it io n s
Pos s ib le caus e

256DIAGNOSTIC PROCEDURES
(1) Check clock spring
CAUTION
If it is not handled properly, the airbag assembly may be triggered and deployed, leading to serious injury to a
person. Therefore, prior to handling, read the service cautions carefully.
See service cautions for SRS.
yDo the related parts of the clock spring work normal? (Are the pins correctly correlated? There should
be no unnecessary short or open circuit, etc). If possible, use a new clock spring to replace the present
one.
Normal: continue with next step.
Abnormal: replace the clock spring.
See SRS-Clock Spring, Removal & Installation.
(2) Ascertain the trouble exists in driver airbag assembly or other parts
1Replace with a new driver airbag assembly.
2Reconnect the negative (-) terminal cable of the battery.
3Turn the ignition switch ON.
4Any DTC displayed? Can it be cleared?
Yes: replace the driver airbag assembly.
See SRS- Driver Airbag Assembly, Removal & Instillation.
No: continue with next step.
(3) Check the connector of clock spring wire harness
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.
5Are the connectors of the clock spring normal? (Are the pins correctly correlated? There should be no
unnecessary short or open circuit, etc). If possible, use a new clock spring to replace the present one.
Normal: continue with next step.
Abnormal: replace the wire harness.
See SRS-Clock Spring, Removal & Installation.
(4) Check the wire harness between clock spring and SRS ECU
1Turn the ignition switch to LOCK.
2Loosen the negative (-) terminal cable from the battery and wait for over 1 minute.
3Remove glove box (along with passenger airbag assembly).
4Loosen passenger airbag assembly connectors.

2575Remove left trim plate.
6Loosen all the SRS unit connectors.
7Check the wire harness between the connector terminals of SRS unit and that of clock spring for the
following:
yGround.
yShort circuit with power supply.
yOpen circuit.
8Is the above-mentioned wire harness normal?
9Normal: completion of trouble diagnosis, and install all the parts.
VAbnormal: replace the wire harness.
6. Passenger side trouble
DIAGNOSTIC PROCEDURES
(1) Is there any passenger airbag assembly installed on the vehicle?
Yes: continue with next step.
No: continue with step (5).
(2) Check the cautions of passenger airbag assembly connector
yIf it is not handled properly, the airbag assembly may be triggered and deployed, leading to serious injury
to a person. Therefore, prior to handling, read the service cautions carefully.
See service cautions for SRS.DTC
B1 352
B1 353
B1 354
B1 355
CAUTION
●
If it is not ha ndle d prope rly, the a irba g a ssembly a nd retrac ta ble sea t belt ma y be
trigge re d a nd deploye d/te nsione d, le a ding to serious injury to a pe rson. There fore , prior
t o ha ndling, r e a d t he s e r vic e c a ut ions c a r e f ully.
See service cautions for SRS.
If there is passenger airbag●
The re sistanc e be twe e n pins 13 a nd 14 of SRS unit c onne ctor is out of range
●
The wire ha rness betwe en pins 13 a nd 14 of the SRS unit is short c irc uited●
P ins 13 a nd 14 of the SRS unit c onnec tor are ope n c ircuite d, e .g. the re is nopassenger airbag
●
Passenger airbag assembly trouble
●
Trouble of the conne c tor be twe e n pa ssenger airbag a ssembly a nd SRS ECU
●
Trouble of the conne c tor be twe e n the SRS unit and ground point
●
The circuit between passenger airbag assembly and SRS ECU is open or short
●
The c irc uit betwee n SRS unit a nd ground point is open or short●
SRS unit trouble P a sse nge r airba g a sse mbly trouble (high or low resista nc e , short c ircuit, ground, etc .)
Checking
conditions
P ossible Cause

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.

259III. DIAGNOSIS OF CRASHED VEHICLEsWhether the SRS is deployed or not, the checking and maintenance of the crashed vehicle shall be carried
out according to the following procedures.
1. Check the diagnostic signal of ECU
(1) Connect the check connector of the Hi-DS T Scan Meter.
(2) Read out the diagnostic results from Hi-DS T Scan Meter.
2. Repair procedures
(1) When the SRS is deployed, the following parts shall be renewed.
1Passenger airbag assembly.
2ECU.
3Driver airbag assembly.
Check the following parts, if abnormal, replace with new ones.
1Clock spring.
2Steering wheel, steering column and steering lower shaft
component.
The installation status of driver airbag assembly in relation to steering wheel.
1Check and see if there is abnormal noise in the steering wheel, the action of the same is good,
or the clearance is normal.
2Check the union joint of the wire harness for damage and the terminal for distortion.
3. ECU
(1) Check the brackets of the ECU Case for recess, crack, distortion, etc.
(2) Check the union joint for damage and terminal for distortion.
(3) Check the installation status of he ECU brackets
1Check the hood for recess, crack, distortion, etc.
2Check the union joint for damage, terminal for distortion
and wire harness for seizure.
3Check the case of the gas generator for recess,
crack and distortion.NOTICE
Due to shock, when the battery power
supply is insufficient, the scan Meter
cannot communicate with ECU, the
instrument panel wire harness shall be
checked and maintained or external
power source shall be used.

260(4) Check the installation status of the airbag assembly.
4. Driver airbag assembly (see the figure below)
5. Clock spring (see the figure on the right)
(1) Check the union joint and protecting tube for damage and the
terminal for distortion.
(2) Check the case for distortion.
6. Steering wheel, steering column and steering lower shaft component.
(1) Check the installation status of driver airbag assembly.
(2) Check the steering wheel for any abnormal noise and see if the
clearance is normal.
7. Check the wire harness joint (instrument panel wire harness).
8. Check and see if the wire harness is securely installed, if the joint is damaged and if the terminal is
distorted.NOTICE
1. Work must be started 60s after the negative (-) terminal cable is disconnected from battery. The
disconnected negative (-) terminal cable shall be protected with insulating tape for insulation.
2. Airbag assembly and clock spring shall not be removed or repaired. They shall be replaced if there is
any trouble.
3. Pay enough attention to airbag assembly and clock spring when using, avoiding dropping them onto the
ground or into water or oil. In addition, if there is any pitting, crack or distortion on them, replace with
new ones.
4. When an airbag is deployed, the deployed surface should face up. It should be kept on a flat surface
without any other items on it.
5. Don’t keep an airbag in a place where the temperature is higher than 93°C.
6. When an airbag is deployed, it shall be replaced with a new one; simultaneously, check the clock spring,
and replace it with a new one if found abnormal.
7. When deal with the deployed airbag, gloves and protective glasses are to be used.
8. When scrapping the undeployed airbag, it shall be discarded after being deployed.GeneratorBracketDriver Side Clock SpringTo HornTo Driver Module

261IV. WARNING MARKSWhen using or maintaining an airbag, the warnings shall be indicated. When maintaining, proceed in accor-
dance with the description of mark. In addition, if the mark is damaged or stained, it shall be replaced.
1. Driver airbag assembly, see Fig. 1.
2. Clock spring, see Fig. 2.
3. ECU, see Fig. 3.
4. Sun Visor, see Fig. 4.
5. Steering wheel, Fig. 5.Warning MarkFigure 1Warning
MarkFigure 2Warning Mark
Figure 3Warning Mark Warning MarkFigure 4 Sun VisorFigure 5