Volvo: S80 Emission System Requires Service - DTC P1332, obd ii scanner, camshaft position

Question
Hello,

I have recently bought a 1999 S80 T6 - I am fairly happy with it, but last week it displayed an "Emission System Requires Service" message.  I could find some info on the web, but most suggested getting an OBD-II DTC scanner to get more information from the car.  I have done this, and when I asked for the stored codes, the scanner shows a P1332 code.  I have only found 1 reference to this on the web - it relates to CVVT (constant variable valve timing) in a V70. I presume the code is the same for the S80?  Also the car infrequently idles poorly, usually whilst in neutral, with the engine surging between about 600-1300RPM.

My question is what does DTC code P1332 mean?  What could be causing this code, and what can I do to try to troubleshoot the problem?  Are there any other readings/information from the OBD-II scanner that I can use to help confirm the cause of the problem?

Thanks in advance,
Jeremy Keen

Answer
Jeremy,
P1332 is Volvo code EMC-644A
Condition
Diagnostic trouble code (DTC) ECM-644A is stored in the engine control module (ECM) if the camshaft is not in the correct position. The engine control module (ECM) registers this as a fault as soon as the engine is started.

The engine control module (ECM) registers a fault and diagnostic trouble code (DTC) ECM-644A is stored in the engine control module (ECM) if the camshaft position (CMP) sensor flanker is not correct in relation to the engine speed (RPM) sensor.

The engine control module (ECM) registers a fault and diagnostic trouble code (DTC) ECM-644A is stored in the engine control module (ECM) if the camshaft does not rotate quickly enough in response to the control signal.

Condition

the variable camshaft is disabled

Possible source

Faulty position

camshaft belt has jumped out of place on the cogs
defective reset valve
mechanical fault in the Variable valve timing (VVT) unit

Faulty control

defective camshaft position (CMP) sensor

Control too slow

open-circuit in signal cable
open-circuit in power cable
contact resistance
short-circuit to ground in signal cable
short-circuit to supply voltage in the signal cable
low oil pressure
poor oil quality
defective reset valve
mechanical fault in the Variable valve timing (VVT) unit

Condition

poor performance