Measuring Instruments
Measuring instruments
General
A breakout box (981 3190), with wiring and connectors (adapters) for connecting the breakout box to the various control systems and the combined instrument, is used to facilitate fault-tracing.
Breakout box
The breakout box (981 3190) consists of a case with 60 measurement socket terminals and a cable with a connector.
The measurement terminals are numbered from 1-60 as illustrated.
Control system AW, Engine management system, LH and EZK
To connect the breakout box to AW, LH and EZK control systems with 30+30-pin connectors, (A+B) applies:
Connector A (engine side) uses measuring terminals 1-30 which correspond to terminals #A1-#A30 on the control module.
Connector B (car side) uses measuring terminals 31-60 which correspond to #B1-#B30 on the control module.
Adapter (981 3195) is used for connection purposes.
Engine management systems Fenix and Motronic
To connect the breakout box to the Fenix and Motronic control systems which have 43+43-pin connectors (A+B):
Use two breakout boxes (A and B) together with adapter (951 1351). The adapter has two connectors marked A and B.
Connector A (engine side) uses measurement terminals 1-43 on breakout box A which correspond to #A1-#A43 on the control module.
Connector B (car side) uses measurement terminals 1-43 on breakout box B which correspond to #B1-#B43 on the control module.
Using the breakout box
Taking readings with the control module connected (circuit in operation)
The breakout box (the boxes) and adapter (981 3195) or (951 1351) are connected between the control module and the control module box connector. This allows voltage readings to be taken with the engine running.
Taking readings with the control module disconnected (split circuit)
The measuring box (the boxes) and adapter (981 3195) or (951 1351) are connected either to the control module connector or to the connector on the control module box. This allows resistance readings to be taken in each circuit without them being affected by other systems.