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.
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HOMESERVICE MANUALSVOLVO2007XC70REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL MODULE (ECM) DIAGNOSTIC TROUBLE CODES (XC) - 3 OF 9ECM-3300: IGNITION COIL CYLINDER 1, SIGNAL. SIGNAL TOO LOW. INTERMITTENT FAULT (B5244T3; 2001-2002)SIGNAL TOO LOW. INTERMITTENT FAULTCHECKING CABLES
2007 Volvo XC70
Checking cables
2007 Volvo XC70SECTION Checking cables
Check signal cable between ignition coil #1 and control module:
- #A31 (#A31) (ECM 3300)
- #A30 (#A30) (ECM 3310)
- #A50 (#50) (ECM 3320)
- #A52 (#52) (ECM 3330)
- #A51 (#A51) (ECM 3340)
for an intermittent short-circuit to ground according to Short-circuit to ground, permanent faults .
Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box .
- To access/replace the ignition coil, see Replacing ignition coils .
- For information about signals:
- For 5 cylinder turbocharged engines -2001, see Signal specification
- For 5 cylinder turbocharged engines 2002, see Signal specification
- For B5254T2 -2004, see Signal description
- For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)
- For B5254T4 2004, see Signal specification (B5254T4 2004)
- For 5 cylinder turbocharged engines 2005-, see Signal specification .
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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.