Suzuki XL7 2007 Service Manual page 167

Circuit/System Description
The camshaft position (CMP) actuator system enables
the engine control module (ECM) to change the timing of
the camshafts while the engine is operating. The CMP
actuator solenoid signal from the ECM is pulse width
modulated (PWM). The ECM controls the CMP actuator
solenoid duty cycle by controlling the amount of solenoid
ON time. The CMP actuator solenoid controls the
advance or the retard of each camshaft. The CMP
actuator solenoid controls the oil flow that applies the
pressure to advance or retard the camshafts.
Ignition voltage is supplied directly to the CMP actuator
solenoid. The ECM controls the solenoid by grounding
the control circuit with a solid state device called a driver.
The ECM compares the camshaft position or the
camshaft angle, to the position of the crankshaft.
Conditions for Running the DTC
• Before the ECM can report DTC P0016, P0017,
P0018, or P0019 failed, DTCs P0010, P0011, P0013,
P0014, P0020, P0021, P0023, P0024, P0335, P0336,
P0338, P0341, P0342, P0343, P0346, P0347, P0348,
P0366, P0367, P0368, P0391, P0392, P0393, P2088,
P2089, P2090, P2091, P2092, P2093, P2094, and
P2095 must run and pass.
• The engine is operating for more than 50 seconds.
• The engine coolant temperature is between 0-95°C
(32-203°F).
• The calculated engine oil temperature is less than
120°C (248°F).
• DTC P0016, P0017, P0018, and P0019 run
continuously once the above conditions are met for
approximately 10 minutes.
Conditions for Setting the DTC
• The ECM detects one of the following conditions:
– The ECM detects a deviation in the relationship
between a camshaft and the crankshaft.
– A camshaft is more than 14 degrees advanced in
relationship to the crankshaft.
– A camshaft is more 14 degrees retarded in
relationship to the crankshaft.
• The ECM detects the difference between an actual
intake camshaft angle and the locked position angle is
more than 20 degrees.
• The ECM detects the difference between an actual
exhaust camshaft angle and the locked position angle
is more than 25 degrees.
• The condition exists for more than 4 seconds or a
cumulative of 50 seconds.
Engine General Information and Diagnosis:
Action Taken When the DTC Sets
DTCs P0016, P0017, P0018, and P0019 are type B
DTCs.
Conditions for Clearing the DTC
DTCs P0016, P0017, P0018, and P0019 are type B
DTCs.
Diagnostic Aids
• Inspect the engine for any recent engine mechanical
repairs. An incorrectly installed camshaft, camshaft
actuator, camshaft sensor, crankshaft sensor, or
timing chain can cause this DTC to set.
• An actuator that is in the full advance or retard
position can cause this DTC to set.
• The presence of DTCs P0008 and P0009 along with
P0016, P0017, P0018, and P0019 indicates a
possible condition with the primary timing chain and
the alignment between both intermediate sprockets
and the crankshaft. Or, the crankshaft reluctor wheel
has moved and is no longer referenced to top dead
center (TDC).
• Observing the desired and actual camshaft angle
parameters, with a scan tool before a DTC sets, may
help to isolate whether a condition is specific to one
camshaft, one bank, or caused by a condition with the
primary crankshaft timing.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Description and Operation
"Camshaft Actuator System Description: "
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
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