Danger | Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC) | Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines. | |
Danger | Risk of death. Death may occur if body parts are drawn into rotating vehicle parts. | Do not insert your hand into rotating parts. Wear closed and snug-fitting work clothes. Secure area of rotating vehicle components against unauthorized access. | |
Danger | Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel. | No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only. | |
Connecting and using test equipment | |||
ECM fuel injection and ignition system, diagnosis, basic knowledge | |||
Connecting socket box, ECM fuel injection and ignition system | Connect contact box, gasoline injection and ignition system ECM | ||
| Check | ||
| If coupling 1 is disconnected from the engine control unit (N3/5) with the ignition ON in vehicles with air conditioning system, the fan ramps up to its full rotational speed (limp-home mode)! When placing the connector housing in position, ensure that they are not tilted. Otherwise, pins on the control unit may be bent. | ||
| Note on the measuring instrument/test connection column. The numbers entered in brackets, such as e.g. in 1.0 (1.40) mean: | ||
| 1 = coupling 1 in the wiring diagram | ||
| 40 = connection 40 in the wiring diagram | ||
| Ignition: OFF | ||
1 | Control unit circuit 30 electrical test, ECM | ||
2 | Control unit circuit 87 electrical test, ECM | ||
3 | Starter relay in control unit box electrical test, ECM | ||
4 | Fuel pump relay electrical test, ECM | ||
5 | Coolant temperature sensor electrical test, ECM | ||
6 | ECM [MSM] control unit rpm signal electrical test, ECM | ||
7 | O2 sensor upstream of CAT electrical test, ECM | ||
8 | |||
9 | Engine low-emission EURO 3/4 | ||
10 | O2 sensor downstream of CAT, O2 sensor heater electrical test, ECM | Engine low-emission EURO 3/4 | |
11 | Air injection relay electrical test, ECM | Engine low-emission EURO 3/4 and vehicle with air pump | |
12 | Air pump switchover valve electrical test, ECM | Engine low-emission EURO 3/4 and vehicle with air pump | |
13 | Air injection malfunction (function chain) electrical test, ECM | Engine low-emission EURO 3/4 and vehicle with air pump | |
14 | Injection valve electrical test, ECM | Y62y1 | |
15 | Injection valve electrical test, ECM | Y62y2 | |
16 | Injection valve electrical test, ECM | Y62y3 | |
17 | Injection valve electrical test, ECM | Y62y4 | |
18 | Purge control valve actuation electrical test, ECM | Y58/1 | |
19 | Purge control valve vacuum control electrical test, ECM | Y58/1 | |
20 | CAN bus electrical test, ECM | ||
21 | Oil sensor (oil level/temperature/quality) electrical test, ECM | ||
22 | Coolant fan motor electrical test, ECM | ||
23 | Engine/AC electric fan electrical test, ECM | ||
24 | Crash signal electrical test, ECM | ||
25 | Diagnostics line electrical test, ECM |
Referenced documents
- ad0000p1000az Connecting and using test equipment
- ad0753p200002a Connecting socket box, ECM fuel injection and ignition system
- ad0753p2000a
- ad0753p2000a ECM fuel injection and ignition system, diagnosis, basic knowledge
- as0000z000401a Risk of death. Death may occur if body parts are drawn into rotating vehicle parts.
- as0000z003501a Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)
- as4700z000101a Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.