Volvo TSI, Manual

Page: 183 / 250

Group 28 Troubleshooting
MID 128 SID 70 Preheater Ele-
ment 1, Check
Special tools: J – 43233, J-39200, J-41132
NOTE!
Check all the particular connectors for loose connections
as well as for switch resistance and oxidation.
For detailed circuit information, refer to “VNL, VNM Elec-
trical Schematics,” Group 37.
Measurement at the component’s
connector, to the EECU
1
Note: An incorrect value (below) can
also cause the component to fail;
therefore, it is important to check the
component if any of the values are in-
correct.
2
Disconnect sense wire (small solid red
wire) at pre-heat relay #1.
Signal wire:
3
Measure the resistance with ohmme-
ter J-39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
Sense wire / al-
ternate ground 1.4 k
J-39200
Check of component
Preheating 1, element
1
Remove the fuse and support (red
plastic part) between the pre-heat re-
lay and the pre-heat element terminal.
Ignition key must be in the OFF posi-
tion.
Measure the resistance with ohmme-
ter J-39200.
Measuring
points Optimal value
Preheat element
terminal / alter-
nate ground <1
J-39200
Check of Subsystem
Preheating 1, element diagnostics
1
Ignition key must be in the ON posi-
tion.
Connect breakout box J-41132 in se-
ries between connector EB and the
EECU. Connect jumper harness J-
43233 in series between connector EA
and the EECU.
Note: Test with “Preheat On” can be
performed only if the EECU has re-
quested pre-heat.
Measuring
points Optimal value
EB5 / EB9 B+ (Preheating
on)
EB5 / EB9 0 V (Preheating
off)
J-41132
J-43233
J-39200
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