Repair instructions Group 30: Electrical system
26
Checking the starter motor
voltage
Special tools: Multimeter 981 2519
General
If battery voltage falls below 24.7 V*, the starter motor
will not be able to crank the engine at normal speed.
A fully charged battery has an open circuit voltage of
about 25.4 V.
* Note. Measured on the batteries.
Voltage measurement, check
1
Check that the battery voltage is at least 24.7 V* when
unloaded by using multimeter 9812519 to measure
between the battery poles.
* Note. Measured on the batteries.
2
Turn the main switch on.
3
Check that the voltage between terminal B+ on the start-
er motor and battery negatives connection point is the
same as the battery voltage.
6
Put the pin back in the right place in the connector be-
fore removing the next pin, if several pins are to be
changed. Check that the locking tongue locks the pin
in the connector.
7
Install the cables with insulation and tie wraps in the
connector, in the reverse order to disassembly.
8
Install the connector in the reverse order to disassembly.
9
Check that the connector and the mating connector on
the engine control unit or power supply unit are clean
and dry.
10
Join up the multi-pin connector. Please refer to ”Con-
trol unit, changing” for advice on joining up the connec-
tor.
11
Start the engine and check carefully that no fault
codes occur.
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