Checking preheater relay
Tools:
9990014 Break-out cable
88890074 Multimeter
1 NOTICE! Turn ignition off.
2 Remove connector B from the EMS2.
3
Connect break-out cable 9990014 between con-
nector B and engine control unit.
4 Use multimeter 88890074 for voltage measure-
ment.
5 NOTICE! Turn ignition on.
Measurement points Nominal value
B7 – B59 U ≈ 0 V
If there is an open circuit in the sense wiring circuit the
multimeter will show:
Measurement points Fault value
B7 – B59 U ≈ 19.5 V
Checking CAN bus cable
Tools:
9998699 Break-out box
88890016 Break-out cable
88890074 Multimeter
The resistance of the CAN bus termination resistors,
one 120 Ω
resistor in the ECU and one 120 Ω resistor
in the cable harness, are measured.
1 NOTICE! Cut the current with the main switch.
2 Disconnect the 8-pin Deutsch connector at the
DCU or disconnect at the CIU.
3 Connect break-out box 9998699 with break-out
cable 88890016 between the engine control unit
and the DCU.
4 Use multimeter 88890074 to do resistance meas-
urement towards the EMS 2.
Measurement points Nominal value
16–17 U ≈ 60 Ω
1 2 3
4 5
6 7
8 9
10 11
12 13 14
15
16 17 18 19 20 21
22 23 24 25
26 27
28
29
30
31 32 33
34 35
36 37 38
39 40
41 42
43
44 45 46 47 48
49
50
51
52
53 54 55 56
57 58 59
60
61 62
9998699
P0013535
30-2 Fault Tracing
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