P0023-BANK 2 CAMSHAFT 2 POSITION ACTUATOR CIRCUIT OPEN
P0023-BANK 2 CAMSHAFT 2 POSITION ACTUATOR CIRCUIT OPEN
For a complete wiring diagram, refer to the Wiring Information.
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Theory of Operation
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| NOTE: |
The CMP sensor is a dual read sensor reading both camshafts of it's correlating bank. |
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3.6L VVT Component Locations |
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CALLOUT |
DESCRIPTION |
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1 |
VVT Actuator Bank 1 Position 2 |
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2 |
VVT Actuator Bank 1 Position 1 |
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3 |
VVT Actuator Bank 2 Position 1 |
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4 |
VVT Actuator Bank 2 Position 2 |
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5 |
Camshaft Position Sensor 2 / 1 Signal |
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6 |
Bank 2 Camshaft Sensor |
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7 |
Camshaft Position Sensor 2 / 2 Signal |
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8 |
Camshaft Position Sensor 1 / 2 Signal |
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9 |
Bank 1 Camshaft Sensor |
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10 |
Camshaft Position Sensor 1 / 1 Signal |
Variable Valve Timing (VVT) allows the Powertrain Control Module (PCM) to monitor and adjust the position of each Camshaft, based on desired torque levels and engine operating conditions. The PCM controls solenoid operated control valves, one for each Camshaft, that are used to direct oil pressure to hydraulic actuators mounted between each Camshaft and its driving sprocket. The oil pressure alters the angular position or phasing of each Camshaft relative to Crankshaft rotation. A sensor is used to monitor the position of each Camshaft.
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When Monitored:
Variable Valve Timing (VVT) rationality is monitored under the following conditions: (1) Cam phasing is commanded off of the default (lockpin) position; (2) Oil temperature is between -12°C to 139°C (10°F to 282°F); (3) Battery voltage is greater than 10.0 Volts; (3) Engine speed is at least 650 to 1400 RPM, depending on oil temperature; (4) No CMP Sensor, CKP Sensor or OBDI plausibility errors. Before VVT can be enabled, reference adaptation must be completed.
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Set Condition:
The PCM detects that the Camshaft 2/2 Control circuit is open.
Possible Causes |
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| VVT EXHAUST 2/2 SOLENOID DRIVER CIRCUIT SHORTED TO GROUND |
| VVT EXHAUST 2/2 SOLENOID DRIVER CIRCUIT SHORTED TO VOLTAGE |
| VVT EXHAUST SOLENOID 2/2 DRIVER CIRCUIT OPEN OR HIGH RESISTANCE |
| VVT EXHAUST SOLENOID 2/2 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)
| NOTE: | Diagnose and repair any system voltage DTCs before continuing with this test. |
| NOTE: | Diagnose and repair any CMP sensor or CKP sensor DTCs before continuing with this test. |
| 1. | Start the engine and allow it to reach normal operating temperature. |
When the engine is operating, do
not stand in direct line with the fan. Do not put your hands near
the pulleys, belts or fan. Do not wear loose clothing. Failure to
follow these instructions may result in possible serious or fatal
injury.
WARNING:
| 2. | With the scan tool, clear DTCs in the Powertrain Control Module (PCM). |
| 3. | Test drive the vehicle under the conditions in which the DTC is monitored, as outlined above. |
| 4. | With the scan tool, select View DTCs. |
Is the DTC Active or Pending at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K277) VVT EXHAUST SOLENOID 2/2 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
| 1. | Turn the ignition off. |
| 2. | Disconnect the VVT Exhaust Solenoid 2/2 harness connector. |
| 3. | Turn the ignition on. |
| 4. | Measure the voltage of the (K277) VVT Exhaust Solenoid 2/2 Driver circuit at the VVT Exhaust Solenoid 2/2 harness connector. |
| NOTE: | The VVT Solenoid Driver circuit is a PWM circuit which will read approximately 8.8 volts with ignition on and the solenoid disconnected. |
Is the voltage equal to battery voltage?
Yes
- Repair the (K277) VVT Exhaust Solenoid 2/2 Driver circuit for a short to voltage.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 3
3. CHECK THE (K277) VVT EXHAUST SOLENOID 2/2 DRIVER CIRCUIT FOR A SHORT TO GROUND
| 1. | Turn the ignition off. |
| 2. | Disconnect the PCM C2 harness connector. |
| 3. | Measure the resistance between ground and the (K277) VVT Exhaust Solenoid 2/2 Driver circuit at the VVT Exhaust Solenoid 2/2 harness connector. |
Is the resistance above 10k Ohms?
Yes
- Go To 4
No
- Repair the (K277) VVT Exhaust Solenoid 2/2 Driver circuit for a short to ground.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
4. CHECK THE (K277) VVT EXHAUST SOLENOID 2/2 DRIVER CIRCUIT FOR AN OPEN/HIGH RESISTANCE
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| 1. | Measure the resistance of the (K277) VVT Exhaust Solenoid 2/2 Driver circuit between the VVT Exhaust Solenoid 2/2 harness connector and the PCM C2 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (K277) VVT Exhaust Solenoid 2/2 Driver circuit for an open circuit or high resistance.
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Perform the POWERTRAIN
VERIFICATION TEST. (Refer to
28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard
Procedure).
5. (K277) VVT EXHAUST SOLENOID 2/2 DRIVER CIRCUIT ACTUATION
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| 1. | Connect the PCM C2 harness connector. |
| 2. | Turn the ignition on. |
| 3. | Using a 12-volt test light connected to ground, check the (K277) VVT Exhaust Solenoid 2/2 Driver circuit in the VVT Exhaust Solenoid 2/2 harness connector. |
| NOTE: | The test light should be off unless you have a short to voltage, except for a brief period immediately after turning ignition on. |
| 4. | With the scan tool, actuate the VVT Exhaust Solenoid 2/2 to the ON (maximum) position. |
| NOTE: | The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. |
Is the test light illuminated and bright?
Yes
- Go To 6
No
- Go To 7
| 1. | Turn the ignition off. |
| 2. | Inspect the wiring and connectors between the VVT Exhaust Solenoid 2/2 and the Powertrain Control Module (PCM). |
| 3. | Verify that there is good pin to terminal contact in the VVT Exhaust Solenoid 2/2 and Powertrain Control Module harness connectors. |
| 4. | Look for any chafed, pierced, pinched or partially broken wires. |
| 5. | Look for broken, bent, pushed out or corroded terminals. |
| 6. | Look for signs of water intrusion past the connector seal. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the VVT Exhaust Solenoid 2/2 in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
7. POWERTRAIN CONTROL MODULE (PCM)
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the VVT Exhaust Solenoid and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched, or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. |
| 4. | Perform any Technical Service Bulletins that may apply. |
| 5. | Look for broken, bent, pushed out or corroded terminals. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the Powertrain Control Module (PCM) in accordance with the service information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control - Removal) .
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).