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 MANUALSVOLVO2004V70 L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-1200SIGNAL TOO HIGH
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2
Signal Too High
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2SECTION Signal Too High
Signal too high
Checking the wiring and component
- Ignition off.
Check the intake air temperature (IAT) sensor resistance between terminals #1 and #2 on the boost pressure sensor.
Note! The intake air temperature (IAT) sensor is integrated in the boost pressure sensor.
Check the signal cable between engine control module (ECM) terminal #A5 (#A5) and boost pressure sensor terminal #2 for short circuit to ground.
Hint: With the ignition on and the boost pressure sensor connector unplugged, the voltage between terminal #2 and the grounding terminal should be 5 V, measured at the connector. Read off air temperature by clicking on the VCT2000 symbol.
If no errors are found and the fault is permanent, replace the intake air temperature (IAT) sensor.
Remedy as necessary.
Other information:
- Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information on signals, 5-cyl: Signal specification Signal Description / Specification
- For information on signals, 6-cyl: Signal specification Signal Description / Specification
- Temperature and pressure sensor, replacing Service and Repair
- For information on resistance values: Component specifications Specifications
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reconnect the connectors, reinstall components etc.
- Ignition on
- Read off the intake air temperature (IAT).
Is the temperature within its permitted range?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - Fault Found
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking the wiring and component
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RENDER: 1.0x
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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.