Help with error code po201

[Pepper]

My 2007 3litre auto patrol suddenly started running like it has only 3 cylinders almost no power the scan gauge shows an error code of po201.....does anyone know what this code represents....also engine management light is on....have cleaned the maf unit with no effect...

[Wazza_66]

Google is your friend mate.
Injector cylinder 1
P0201 means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.
The causes could be any of the following:

Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
Open in the wiring to the injector
Short in the wiring to the injector
Bad PCM

[Wazza_66]

Pepper

Sorry forgot the next bit.

Possible Solutions
First, using a DVOM check the resistance of the injector. If it isn't within specs, then replace the injector.
Check for voltage at the fuel injector connector. It should have 10 volts or more.
Visually check the connector for damage or broken wires.
Visually check the injector for damage.
If you have access to an injector tester, activate the injector and see if it operates. If the injector operates, then you likely have either an open in the wiring, or a blocked injector. If you do not have access to a tester, swap the injector with another one and see if the code changes. If the code changes, then change the injector.
At the PCM, remove the driver wire from the PCM connector and Ground the wire. (Make sure you have the correct wire. If you're not sure, do not attempt) The injector should activate
Replace the injector

Wazza

[Pepper]

wazza,you are correct,checked with uncle google and found exactly what you suggested..all fixed now,didnt realise you could simply enter "nissan error code xyz "into google and get a response.
Thankyou for taking the time to reply.
Certainly better than nissans responce of "we are booked out till next monday ask nissan assist to truck it in then" meaning no vehicle to use for about a week .....

[Wazza_66]

Pepper,
Glad that you got it fixed.