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Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Electronic Control Module (ECM) Diagnostic Trouble Codes - 2 Of 3 (644 Body)) >> ECM-78: Engine Speed (Rpm) Sensor. Faulty Signal. Permanent Fault (B4204T2 CVVT; 2000) >> Faulty signal. Permanent fault >> Verification

Faulty signal. Permanent fault: Verification

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Start Verification
GLL101037Courtesy of VOLVO CARS OF NORTH AMERICA.

Start the engine. Allow the engine to run at idle speed for 30 seconds.

Ignition off for 30 seconds.

NOTE: If the engine cooling fan (FC) is running, the ignition must be off for 30 seconds after the engine cooling fan (FC) has stopped.

Start the engine. Allow the engine to run at idle speed for 30 seconds.

Read off the status of the diagnostic trouble code (DTC).

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
GLL100563Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the status intermittent? 

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