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 MANUALSVOLVO2004S80 L6-2.9L TURBO VIN 91 B6294TREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-1200SIGNAL TOO HIGH
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Signal Too High
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION 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, B5254T2 Connecting the Test Box
- For information on signals, 5-cyl: Signal specification Signal Specification
- For information on signals, 6-cyl: Signal specification Signal 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 - Verification completed
No - Fault-tracing information
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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 - Exit Fault-Tracing
No - Attempt New Test
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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.