Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Tools For Off Board Diagnostics
Troubleshooting instrument ("Carpenter's toolbox")
This troubleshooting instrument ("Carpenter's toolbox") (998-8195) is connected in parallel with the fuel control module and the vehicle's cable harness. Using the control on the box itself, you choose which values that the analogue display is to show.
The box also contains two light-emitting diodes, one green and one red which are turn on/off, e. g., at released or pressed down accelerator (check of throttle switch).
A number of different adapters made it possible to connect to different control modules.
Example of fuel systems where the tool can be used:
- LH-Jetronic, B200/230-engines for model 200/700.
- LE/LU-Jetronic, for model 360.
- Fenix, model 400.
- Motronic, model 740/760 Turbo.
Volvo System Tester - parallel connection
Volvo System Tester - parallel connection was introduced for model year 1986, as a troubleshooting instrument where you connected in parallel between the control module and the cable harness.
Volvo System Tester measured input and output signals in analogue mode and signals were then shown in Volvo System Tester. It was also possible to detect intermittent malfunctions.
With Volvo System Tester connected, it was possible to:
- Reading off values of signals such as coolant temperature, voltage on heated oxygen sensor, etc.
- Monitor certain signals and compare with pre-programmed values as well as register and store deviations.
A number of different adapters made it possible to connect to different control modules.
Thus, at parallel connection, diagnosis is performed of Volvo System Tester.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.