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 ia 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 alot of metal
debre on the screens of the actuator, this can be a sign of excessive endplay on the
crankshaft. This would mean engine overhaul, or replacement if the endplay 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 endplay, 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 ia 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 alot of metal
debre on the screens of the actuator, this can be a sign of excessive endplay on the
crankshaft. This would mean engine overhaul, or replacement if the endplay 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 endplay, 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.
