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Home >> Volvo >> 1998 >> C70 Convertible L5-2.3L Turbo VIN 53 B5234T3 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Checking Signal From The Transmission Control Module (TCM) >> Fault-Tracing Information
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Fault-Tracing Information






Fault-tracing information

Engine speed dips when a gear is selected (automatic transmission)

Condition
- no diagnostic trouble codes (DTCs) stored
- engine at normal operating temperature.
- the fault is permanent.

Possible source
- open-circuit in signal cable from AW 50-42
- short-circuit to ground or supply voltage in signal cable
- contact resistance in connectors
- defective gear selector or idle air control (IAC) valve.

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