NJUUULMM

1124

Oxygen sensor

The flashing code is listed in the Diagnosing/Troubleshooting plan on page D 24/28-7.

The fault can also be read direct using System Tester 9288. After a repair the fault memory must be erased using the System Tester.

Fuel System, Electronic Injection

Test point Title Page

EZK ignition system

Effect of faults (checklist) 3

Fault memory 4

Connections to plugs, EZK control unit 4

1 Idle speed contact 5

2 Full load contact 6

3 Engine temperature sensor II 7

4 Idle and full load contact 7

5 Load signal 7

6 Transmission protection switch 7

7 Knock sensor 1 8

8 Knock sensor II 9

9 Control unit (knock sensor) 9

10 Hall signal 9

11 Control unit faulty 10

12 Permanent power supply 10

13 Engine speed/reference mark transmitter 11

14 Ignition circuit monitoring 12

15 Ignition system - output stages 12

16 Leads K and L 15

10 LU

CM X

CD CM

Tester a c;

Fault code 2

CD CM

*

a> c

o

Ol

E

CD

m o "r

■o

-C -,—'

CO Jz

(U O)

CO

o

CtJ x:

C

cu

CO

h

o

e ro

«

LU

m

CD CB

"O

"5

ta c

Test point

Engine will not start

Engine hard to start

Irregular idling

Poor pick-up

Misfiring

High fuel consumption

Low power output

Engine hesitation

Poor hot starting

Diagnosis not possible

X

X

12

Power supply

V

35 ->-18 29 -»18

X

X

X

13

Engine speed reference mark sensor

cx

23 h, 6

X

X

X

X

X

X

X

X

14

Ignition circuit monitoring

X

X

X

X

X

X

X

X

15

Ignition system output stages

at

X

16

Leads K and L

Q

V = Voltmeter Q = Ohmmeter s = Oscilloskope

See inner page for plug terminal assignments on EZK control unit

Fault memory, EZK control unit

Fault memory, EZK control unit, 928 S4/GT

Idle contact

Full load contact

I Knock sensor 2

Control unit faulty

Engine temperature sensor 2

Hall signal

Idle or full load contact

Control unit faulty

Load sig. LH term.

25 to EZK term. 9

Transmission safety switch

Knock sensor 1

Plug Connections EZK

Temperature sensor NTC II Knock sensor 1

Knock sensor 2 Hall sender 0

Speed sender +

Speed sender shield

Transmission protection switch

Throttle valve switch Full load

Coding input

Coding input

Power supply Term. 15 from XVI 87 (XXII)

Diagnosis plug term. 11

Ignition pulse to control unit 1 (left)

Permanent positive 30

CD CM

cd CsJ

CD cm

co vT

r-CD

Diagnosis (K-!ead)

Shielding Knock sensor 1

Shielding Knock sensor 2

Shielding Hall sender

Hall sender +

Diagnosis inciting lead (L-lead)

Throttle valve switch Idle speed

Load signal from lh 25

Coding input

Speed pulse to LH 1

Diagnosis plug 4

Ignition pulse to control unit 2 (right)

Ground MP IX

Fault, Fault Code

Possible Causes, Elimination, Remarks

Test point 1 Idle speed contact Q Ground short Break

Fault code 2 12

Check with circuit input test, using 9288 system tester or 9268 tester 9268 tester

Select the test step and depress the accelerator pedal. 9288 display: Idle speed contact closed Idle speed contact open

9268 display: 1332 (idle speed contact closed) 0000 (idle speed contact open).

If the display does not change, disconnect the plugs from the EZK and LH control units.

Using test leads, connect ohmmeter between terminals 8 and 18.

Display:

Throttle valve closed Throttle valve opening angle

If the idle speed contact values are not reached during this test, it must be repeated directly at the throttle valve switch:

Pull off plug at throttle valve switch. Connect ohmmeter between terminals 2 and 3 of the throttle valve switch, using test leads.

Display:

Throttle valve closed < 10 Q Throttle valve opening angle > 1° = ® Q

Check that setting is correct and adjust if necessary.

Possible cause: incorrectly adjusted throttle valve switch or accelerator cable.

Fault, Fault Code

Possible Causes, Elimination, Remarks

Test point 2 Full load contact (Q) Ground short

Fault code 2 13

Check by means of circuit input test with 9288 system tester or 9268 tester

Select the test step and depress the accelerator pedal. 9288 display: Full load contact open

Full load contact closed. 9268 display: 1333 (full load contact open) 0000 (full load contact closed).

No display:

Disconnect the plug from the EZK and LH control unit and connect the ohmmeter with terminals 18 and 26, using test leads.

Display:

Throttle valve closed <» Q

Throttle valve open < 10 Q

If the full load contact values are not reached during this test, repeat the test directly at the throttle valve switch:

Disconnect the plug at the throttle valve switch. Connect the ohmmeter between terminals 1 and 2 of the throttle valve switch, using test leads.

Display:

Throttle valve closed <® q

Throttle valve open < 10 Q

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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