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Check the condition of the wiring harness between the two brain boxes under the hood. The black box in front of the rightside strut tower contains both the engine's ECU box and the transmission's TCM box. The 3-3-5 code means they're not talking to each other and there may be a problem (a short) in the wiring harness between the two boxes. Here's some troubleshooting from the book:
Code 3-3-5 (Fault In Wiring Between TCM and ECM)
1) Check status message on Volvo Scan Tool (998-8686)(You don't have one...).
If status message is PERMANENT FAULT, SIGNAL TOO HIGH or PERMANENT FAULT,
SIGNAL TOO LOW, go to next step. If status message is INTERMITTENT
FAULT, SIGNAL TOO HIGH or INTERMITTENT FAULT, SIGNAL TOO LOW, go to
step 3).
2) If fault is permanent and signal is too high, check wiring
between ECM terminal B26 and Transmission Control Module (TCM)
terminal B15 for a short circuit to voltage. If fault is permanent and
signal is too low, check wiring between ECM terminal B26 and TCM
terminal B15 for a short circuit to ground.
3) If fault is intermittent and signal is too high, check
wiring between ECM terminal B26 and TCM terminal B15 for an
intermittent short circuit to voltage. If fault is intermittent and
signal is too low, check wiring between ECM terminal B26 and TCM
terminal B15 for an intermittent short circuit to ground.
The best you can do is use a digital multimeter and do the checks they recommend and see if you can find the short or break in the wiring and fix it. It could end up being just corrosion on the terminal pins blocking the signal too. In that case you could just clean the contact pins and that would solve the problem too. This is just to give you something to look at and maybe you'll get lucky.
Mike
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