| Table 1: | CMP Actuator Authority Table |
Circuit Description
The camshaft position (CMP) actuator system is comprised of four CMP actuator solenoids, four oil control valves, and four CMP actuators. The engine control module (ECM) sends an electrical signal to the CMP actuator solenoids through the control circuits when a camshaft timing change is desired. The ground circuits of the CMP actuator solenoids are used as a return. The CMP actuator solenoid uses electromagnetic force to pull on the plunger of the oil control valve. The oil control valve will port the pressurized engine oil to either the advancing or retarding chambers of the CMP actuator. The CMP actuator, in turn, changes the camshaft position relative to the crankshaft position.
Camshaft position relative to crankshaft position | Crankshaft position when the intake or exhaust valve begins to open with camshaft actuators in park. | Crankshaft position when the intake or exhaust valve begins to open with camshaft actuators at full travel. |
|---|---|---|
Intake Camshafts | 133° ATDC (CMP actuator position is at 0° on scan tool). | 93° ATDC (CMP actuator position is at 40° on scan tool) |
Exhaust Camshafts | 117° BTDC (CMP actuator position is at 0° on scan tool) | 67° BTDC (CMP actuator position is at 50° on scan tool) |
If the desired camshaft position does not match the actual camshaft position for a calibrated amount of time, DTC P0011, P0014, P0021 or P0024 will set.
Conditions for Running the DTC
| • | DTCs P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, P0391, P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095 are not set. |
| • | The CMP actuators are commanded. |
| • | The engine oil pressure is between 100-696.4 kPa (14.5-101 psi). |
| • | The engine speed is at an RPM, between 1,000-6,500 RPM, that will allow for steady activation of the cam actuators based on calculated engine oil temperature. |
| • | The calculated engine oil temperature is between -10 to +150°C (14-302°F) |
| • | The ignition voltage is between 11-16 volts. |
Conditions for Setting the DTC
| • | The ECM detects the difference between the desired camshaft position and the actual camshaft position angles is more than 6 degrees. |
| • | The above condition exists for more than 16 seconds. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
The CMP actuator system will be disabled until the end of the ignition cycle.
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Values | Yes | No | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||||||||||
2 |
Did the DTC fail this ignition? | -- | Go to Step 3 | Go to Intermittent Conditions | ||||||||||||||
3 | Test for an intermittent and for a poor connection at the affected camshaft position (CMP) actuator solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 4 | |||||||||||||||
4 |
Is the resistance within the specified value for the specified CMP actuator solenoid temperature? | 3.26-3.66 ohms at -40°C (-40°F) 4.00-4.50 ohms at 20°C (68°F) 4.02-4.52 ohms at 25°C (77°F) 5.68-6.38 ohms at 125°C (257°F) | Go to Step 5 | Go to Step 9 | ||||||||||||||
5 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6 | ||||||||||||||
6 |
Did you find and correct the condition? | 2.5 ohms | Go to Step 11 | Go to Step 7 | ||||||||||||||
7 | Test the ground circuit of the affected CMP actuator solenoid for resistance that is more than the specified value. Refer to Ground Distribution Schematics and to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | 2.5 ohms | Go to Step 11 | Go to Step 8 | ||||||||||||||
8 | Test for the following conditions:
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||||||||||
9 | Replace the affected CMP actuator solenoid. Refer to Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake , or Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||||||||
10 | Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||||||||
11 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 12 | ||||||||||||||
12 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK | ||||||||||||||
