Specifications

Service Training
Section 4.9
Page 51
12.05
ELECTRONIC CONTROL SYSTEM
ENGINE SPEED REGULATOR SUPPLY VOLTAGE
- Connect voltmeter between the connections X/N2:3 and X/N2:25 on the disconnected plug X/N2.
- Switch ignition on.
- The meter should show 12 V (= supply voltage) from engine speed regulator N2.
NOTE: If this value is not obtained, check cabling (+) and (-) supply line.
- Plug X/N2 plug back into the engine speed regulator N2.
SPEED REGULATOR MIDPOINT VOLTAGE
NOTE: A precise midpoint voltage is required for the following measurements and for the correct
operation of the speed regulator.
- Disconnect plug X/B1 and connect meter (voltmeter) between connection X/B1:2 and earth of truck.
- Switch ignition on.
- Meter should show 5 V = midpoint voltage.
NOTE: If the meter shows no voltage value or an incorrect value, the cabling on plug X/B1 and the
supply voltage from N2 must be checked or speed regulator N2 replaced.
- Reconnect plug X/B1.
NOMINAL VALUE TRANSMITTER
- Connect meter for voltage measurement between connections X/B2:1 and X/B1:2. The plugs remain
connected. Plug in the measuring prods at the indicated measuring points.For this purpose, the rubber
bush must be removed from plug X/B1.
- Switch ignition on.
Meter shows voltage of 2 V (preset by speed regulator).
- Voltage measurement between connections X/B2:3 and X/B1:2. Plugs remain connected. Plug in the
measuring prods at the indicated measuring points.
For this purpose, the rubber bush must be removed
from plug X/B1. Meter shows voltage of 750 ± 15 mV (preset by speed regulator).