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 (Calif.) 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: