Question about 1998 Volvo S70
No spark camshaft position sensor cable shows 12 vdc on pin 2 and 3. (chilton manual says pin 2 should read 5 vdc) i have replaced 2 ecus on this car in the past 3 years or so. When rthey have failed I have had the same symptom no spark etc. i have read that failed ecus are rare. I think I may have blown another one. questions: do I have another bad ecu? how can I tell the ecu is bad without buying another used one? can a Volvo dealership test it? if it's bad what is causing their failure?
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3.0L (VIN S) Engine
Front of the engine attached to the forward cylinder head.
3.0L (VIN U, 2) Engines
Ford Sable, Taurus 2000-05
Camshaft Position Sensor
Description & Operation
The Camshaft Position Sensor (CMP) is a variable reluctance sensor that is triggered by a high point on the left-hand exhaust camshaft sprocket. The CMP sends a signal relating camshaft position back to the PCM which is used by the PCM to control engine timing.
The CMP sensor detects the position of the camshaft. The CMP sensor identifies when piston No. 1 is on its compression stroke. A signal is then sent to the PCM and used for synchronizing the sequential firing of the fuel injectors. Coil-on-plug (COP) ignition applications use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit. DTC P0340 is associated with this sensor.
Removal & Installation
3.0L (VIN S) Engine
Fig. Camshaft Position Sensor-3.0L (VIN S) Engine
Fig. Testing the VPWR circuit of the CMP sensor
Fig. Camshaft Position Sensor Connector
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