Problem with my 2002 chevy Trailblazer. 4200 inline 6 cyl.
Dear JK. I have a customer with a SES code p0016 and i am not too familiar with the
adjustable cam timing on this 4.2l engine. Would appreciate some help. Thanks.
JK:
A common cause for code p0014 or p0106 on Trailblazers and GMC Envoy is the
'Exhaust Cam Actuator Control Solenoid'. They fail internally, or they leak oil into the
connector cavity. It is mounted to the front pass. side of the cylinder head near the
power steering pump. When it fails, it can also give 'Crank sensor correlation codes'.
After replacement, a 'Crank sensor variation re-learn' procedure must be performed.
Have also had a FEW of the Cam Actuators fail, but not many. The actuator is part of
the exhaust cam timing gear and the front timing upper cover will have to come off.
This is a very involved repair and would highly suggest an experienced technician for
this.
The problem is that if these things are not the problem, and there is allot of metal
debre on the screens of the actuator, this can be a sign of excessive end play on the
crankshaft. This would mean engine overhaul, or replacement if the end play is
severe enough to cause damage to the engine block. This is worst case scenario.
Most of the time it is just the solenoid, and cam / crank position variance re-learn
procedure will take care of it. If by chance the replacement of the tensioner and belt
was for belt noise, this could be an indication of excessive crankshaft end play, as the
belt would not be aligned with the other pulleys since the crankshaft has walked
forward.
Dear JK. I have a customer with a SES code p0016 and i am not too familiar with the
adjustable cam timing on this 4.2l engine. Would appreciate some help. Thanks.
JK:
A common cause for code p0014 or p0106 on Trailblazers and GMC Envoy is the
'Exhaust Cam Actuator Control Solenoid'. They fail internally, or they leak oil into the
connector cavity. It is mounted to the front pass. side of the cylinder head near the
power steering pump. When it fails, it can also give 'Crank sensor correlation codes'.
After replacement, a 'Crank sensor variation re-learn' procedure must be performed.
Have also had a FEW of the Cam Actuators fail, but not many. The actuator is part of
the exhaust cam timing gear and the front timing upper cover will have to come off.
This is a very involved repair and would highly suggest an experienced technician for
this.
The problem is that if these things are not the problem, and there is allot of metal
debre on the screens of the actuator, this can be a sign of excessive end play on the
crankshaft. This would mean engine overhaul, or replacement if the end play is
severe enough to cause damage to the engine block. This is worst case scenario.
Most of the time it is just the solenoid, and cam / crank position variance re-learn
procedure will take care of it. If by chance the replacement of the tensioner and belt
was for belt noise, this could be an indication of excessive crankshaft end play, as the
belt would not be aligned with the other pulleys since the crankshaft has walked
forward.
| OBD2 trouble code p0016 or p0014 repair. Chevrolet Trailblazer, GMC Envoy. |
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The cam phasing system is a hydraulically actuated phase shifting mechanism. The powertrain control module (PCM)
supplies the ignition positive driver and ground circuits. A pulse width modulated (PWM) driver controls the amount that the
camshaft actuator solenoid assembly advances or retards the exhaust camshaft. The exhaust camshaft is commanded to
a maximum retard position of 25 degrees. When the exhaust camshaft is retarded at the maximum rate, the duty cycle of the
signal is at 100 percent. The maximum advance rate has a 0 percent duty cycle. Other than when the camshaft is at full
advance, a 50 percent duty cycle is used to maintain a steady retard angle.
supplies the ignition positive driver and ground circuits. A pulse width modulated (PWM) driver controls the amount that the
camshaft actuator solenoid assembly advances or retards the exhaust camshaft. The exhaust camshaft is commanded to
a maximum retard position of 25 degrees. When the exhaust camshaft is retarded at the maximum rate, the duty cycle of the
signal is at 100 percent. The maximum advance rate has a 0 percent duty cycle. Other than when the camshaft is at full
advance, a 50 percent duty cycle is used to maintain a steady retard angle.
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| 8-19-11 Since this solenoid only controls oil to the exhaust cam phaser why would the "crank sensor variation re-learn procedure need to be done if it is replaced? Nothing with the cam to crank timing is effected by replacing that control solenoid. |
Comments
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| 1-6-12 After I have changed the exhaust cam actuator solenoid,how do I do a relearn? |
| You need a scan tool that has that capability of doing the relearn. You can go to the dealer and pay 1/2 labor to have them do it for you. |
| 2-5-12 Hello to all, Ok i have a 2002 Chevy Trailblazer, first go to your local auto store and have them do a free diagnostic. I use AutoZone. Once it comes up P0014..then you just saved over $100+. Now call a major Chevy dealer and buy the cam actuator for about $100.00. Make sure you do not by a refurbished,or a used one. It is about 6 inches long w/ holes in the groves,that part goes in the motor and a solid end 1" with a connector on the end that is visible.(silver) It is located by the power steering pump. Then have your trusted mechanic do the job..it totals about $150.00+ for everything ,if you have the dealer do it,its about $700.00. When you replace this, I recommend a tune-up, plugs and oil change at the same time, and to replace the camshaft positioning sensor(its above the cam actuator) it costs about $30 at an auto store.......Then once the auto shop replaces this they will rest the cars computer...then take a long drive on the highway 25min there and 25min back ... Then park the car let it completely cool down . Then start the car up and let it run on idle for about 5-10min with everything on....then take a ride to the auto store i use Auto Zone. To have another diagnostics check, even if the light Isn't on, This way you know everything is working properly and its free...This i would not recommended doing your self..even if you have basic mechanical skills ,this small part controls just about everything....I hope this helps , good luck....-JB |
