Reading Fault Codes (LH Jetronic)
Test Connection For Diagnosis:
Be cautious of all WARNINGS listed under the "Test Conditions" column of each System Test.
Connect Impulse Counter According To Connection Diagram.
LED "U-BATT" light should display.
If not, check:
a) Voltage Supply
b) Fuse of impulse counter.
Reading Stored Fault Codes.
a) Ignition: ON
b) Press start button for 2 - 4 seconds
c) Record impulse display
d) Press start button again for 2 - 4 seconds
e) Record impulse display
repeat steps d) and e) until the first impulse display is repeated
Erasing Stored Fault Codes 1)
a) Press start button for 2 - 4 seconds (impulse displayed)
b) Wait 3 seconds, then press start button 6 - 8 seconds, this
will erase the previously displayed fault code.
c) Each fault code must be erased individually.
1) Erasing of stored fault codes must begin within 20 seconds after reading the code.
Connector Layout:
Diagnostic Test Connection
1 Ground
2 Push-button (Cailf.) Not Used (Federal)
3 CIS-E Control unit
4 LED (Calif.) Not Used (Federal)
5 ASD Control unit (Calif.) ASD/4MATIC (Federal.)
6 SRS Control unit
7 Roll bar Control unit (Model 129)
ACC (Model 124)
8 EZL/AKR Ignition Control unit
9 ADS control unit
10 Power soft top Control unit
11 ATA Control unit
12 Infrared remote Control unit
13 5-speed A/T Control unit
14 Engine systems Control unit (MAS)
15 Not used
16 Circuit 15R
Cruise Control Impulse Readout Codes:
Impulse Code Readout
Diagnosis Test Tools:
Special Tools
Preparation For Fault Code Readout Of ABS/ASR Control Unit
1. For diagnosis, connect the impulse counter and adaptor to test connection, (impulse readout 38-pole) according to connection diagram.
NOTE: Connect yellow wire for impulse readout of ABS/ASR control unit to socket 6, or for base module, to socket 8.
2. Read out fault code memory for ABS/ASR control unit and base module.
3. Ignition: ON
Test Connection For Diagnosis:
Be cautious of all WARNINGS listed under the "Test Conditions" column of each System Test.
Connect Impulse Counter According To Connection Diagram.
LED "U-BATT" light should display.
If not, check:
a) Voltage Supply
b) Fuse of impulse counter.
Reading Stored Fault Codes.
a) Ignition: ON
b) Press start button for 2 - 4 seconds
c) Record impulse display
d) Press start button again for 2 - 4 seconds
e) Record impulse display
repeat steps d) and e) until the first impulse display is repeated
Erasing Stored Fault Codes 1)
a) Press start button for 2 - 4 seconds (impulse displayed)
b) Wait 3 seconds, then press start button 6 - 8 seconds, this
will erase the previously displayed fault code.
c) Each fault code must be erased individually.
1) Erasing of stored fault codes must begin within 20 seconds after reading the code.
Diagnostic Test Conection Layout:
Diagnostic Test Connection
1 Ground (W12, W15a) (electronic ground)
2 Voltage circuit 87, 15z
3 Circuit 30
4 LH control unit, M104, M119, M120 right bank 1)
5 LH control unit, M120 left bank 1)
6 ABS/ASR control unit 1)
7 Electronic Accelerator Pedal control unit 1)
8 Base module 1)
9 ASD control unit 1)
10 5-speed automatic transmission control unit 1)
11 ADS control unit 1)
12 Speed Sensitive Power Steering
13 Not used
14 Not used
15 Instrument cluster
16 ACC 1)
17 EZL, M104, 119, M120 right bank 1)
18 EZL, M120 left bank 1)
19 CARB 1)
20 Central Locking
21 Convenience control unit
22 Reserve
23 ATA control unit 1)
24 Not used
25 Not used
26 Not used
27 Not used
28 Not used
29 Driver memory
30 SRS control unit
31 Infrared Remote control unit 1)
32 Not used
33 Not used
34 Not used
35 Closing Assist control unit
36 Not used
37 Not used
38 Not used
1) Diagnostic capability via serial interface not available
Cruise Control Impulse Readout Codes:
Impulse Code Readout