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Integrated Power Module and Smart Junction Box Diagnosis Assessment
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What is a quick way to see if a relay is replaceable?
see if it is green
check the schematic
look up the part number
read the label
The benefits of using an FET in place of a relay are:
current limiting
reduced heat
less voltage drop
less voltage needed
Rest voltage for CAN communication should read:
0.0v
2.5v
5.0v
12.0v
The vehicle from the wiring diagram below cranks but will not start. While cranking, the voltage measurement shown was taken. This indicates:
Wiring Diagram
Shorted ECM relay contacts
No ground for the ECM relay
Blown fuse 53
Open in ECM relay coil
On a vehicle with a CAN bus, the resistance between pins 6 and 14 in the DLC should be:
40 ohms
60 ohms
120 ohms
240 ohms
Which of the following inputs are not used to determine power mode on GM vehicles:
Ignition 1 voltage
Off/Run/Crank voltage
Immobilizer data
Accessory voltage
If a B1392 code sets in a Ford Smart Junction Box, it must be replaced.
True
False
A Dodge truck has one headlamp out. No voltage is being supplied to the bulb by the TIPM. It could be caused by:
open ground at load
shorted supply wire
bad headlamp switch
open bulb
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