Some diagnosis for 160VVC k series in an MG TF

[RogNeedham]

*thumbup*On behalf of a mate and his recently acquired track day device!

Engine is installed in a 2002 MG TF 160. The engine starts fine & idles smoothly, but when it's revved, it hits a limiter at about 5,750rpm. Snap-On diagnostics yields fault code P1522 which it says is "Variable Intake Solenoid #2 Circuit Malfunction". The solenoids are both measuring the resistance they should (7 ohms) and the brown, blue and black plugs to solenoids and temp sensor are all plugged in as they should be. Any help on solving this problem would be greatly appreciated :) Thanks
 

Sounds a bit ECU to me..but would welcome more knowledgeable input

rog

[6speedmanual]

Harness continuity check from sensor plugs to ECU?

Can the fault code be cleared?

Does the fault immediately occur again?

Is it possible to discern when driving below 5750rpm whether vvc is doind anything or is it just stuck on one setting?

HTH

Peter

[RogNeedham]

thanks 6SM- wlll pass it on

[Mankee]

I don't have much working experience with the VVC units as I junked them straight away, but I'm sure I read somewhere that if the black and blue plugs are transposed, you get the lowered rev limit your mate is seeing.

[ECR]

Can't remember where I collected this but here's some ideas ....

VVC Failure Modes

ECT Sensor low/error limits to 6K RPM

MAP Sensor error limits to 6K RPM

VVC Oil Temp Sensor low/error limites to 6K RPM

VVC Solenoid low resistance (should be 6.6 to 8.8 Ohms) limits to 5.5K RPM

ECU VVC control circuit fried (from wrong battery polarity) limits to 5.5K RPM

Cam Position Sensor limits to 5.5K RPM (The VVC CPS is NSC000010 variable reluctance, different to the standard K16 Hall effect)