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LF1, LFW, LFX, LWR




DTC P0016, P0017, P0018, or P0019 (LF1, LFW, LFX, LWR)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0016
- Crankshaft Position - Intake Camshaft Position (CMP) Correlation Bank 1

DTC P0017
- Crankshaft Position - Exhaust Camshaft Position (CMP) Correlation Bank 1

DTC P0018
- Crankshaft Position - Intake Camshaft Position (CMP) Correlation Bank 2

DTC P0019
- Crankshaft Position - Exhaust Camshaft Position (CMP) Correlation Bank 2

Circuit/System Description

The engine control module (ECM) uses the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor pulses to monitor the correlation between the crankshaft and the camshaft position. The CKP sensor works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is spaced 6 degrees apart with one span having a 12 degree space. The ECM uses the 12 degree space to determine top dead center (TDC) for cylinders 1 and 4. The camshaft reluctor wheel has 4 teeth, 2 narrow, and 2 wide. The 4 trailing edges of each tooth are evenly spaced at 90 degrees apart around the circumference of the camshaft sprocket. With the engine running, and the CMP actuator in the parked position, the ECM expects the camshaft signal pulses to occur 36 crankshaft degrees before top dead center (BTDC) for cylinder number 1, and every 90 degrees thereafter.

Conditions for Running the DTC

* DTC P0335, P0336, P0338, P0340, P0341, P0345, P0346, P0365, P0366, P0390, P0391, P0641, and P0651 are not set.
* The engine is operating.
* The crankshaft and camshaft position signals are synchronized.
* The camshaft position actuator is in the parked position.
* DTC P0016, P0017, P0018, and P0019 run continuously once the above conditions are met.

Conditions for Setting the DTC

DTC P0016, P0017, P0018, or P0019

The ECM detects that one camshaft is mis-aligned with the crankshaft. The ECM detects one of the following conditions:

* Bank 1 intake camshaft is greater than 9 degrees retarded or 12 degrees advanced in relationship to the crankshaft.
* Bank 1 exhaust camshaft is greater than 10 degrees retarded or 13 degrees advanced in relationship to the crankshaft.
* Bank 2 intake camshaft is greater than 11 degrees retarded or 13 degrees advanced in relationship to the crankshaft.
* Bank 2 exhaust camshaft is greater than 9 degrees retarded or 13 degrees advanced in relationship to the crankshaft.

DTC P0016 and P0017

The ECM detects that both camshafts on bank 1 are mis-aligned with the crankshaft. The ECM detects the following conditions:

* Bank 1 intake camshaft is greater than 6 degrees retarded or 9 degrees advanced in relationship to the crankshaft.
* Bank 1 exhaust camshaft is greater than 6 degrees retarded or 9 degrees advanced in relationship to the crankshaft.

DTC P0018 and P0019

The ECM detects that both camshafts on bank 2 are mis-aligned with the crankshaft. The ECM detects the following conditions:

* Bank 2 intake camshaft is greater than 6 degrees retarded or 9 degrees advanced in relationship to the crankshaft.
* Bank 2 exhaust camshaft is greater than 7 degrees retarded or 9 degrees advanced in relationship to the crankshaft.

DTC P0016, P0017, P0018, and P0019

The ECM detects that all 4 camshafts are mis-aligned with the crankshaft. The ECM detects the following conditions:

* Bank 1 intake camshaft is greater than 6 degrees retarded or 9 degrees advanced in relationship to the crankshaft.
* Bank 1 exhaust camshaft is greater than 6 degrees retarded or 9 degrees advanced in relationship to the crankshaft.
* Bank 2 intake camshaft is greater than 6 degrees retarded or 8 degrees advanced in relationship to the crankshaft.
* Bank 2 exhaust camshaft is greater than 7 degrees retarded or 9 degrees advanced in relationship to the crankshaft.

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 secondary timing chain can cause this DTC to set.
* A single failed camshaft actuator or actuator solenoid will not cause this DTC to set. This diagnostic algorithm is designed to detect an alignment condition between a primary intermediate sprocket and the secondary timing chain, or the alignment between a primary intermediate sprocket and the crankshaft. Either condition would cause the camshaft timing for both cams on one bank to be off an equal number of degrees.
* DTCs P0016, P0017, P0018, and P0019 set at the same time 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 [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Camshaft Actuator System Description Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Ignition ON, observe the DTC information with a scan tool. Verify that none of the following DTCs are set. DTC P0010, P0013, P0020, P0023, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391.

If any of the DTCs listed are set refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. Idle the engine at the normal operating temperature. Observe the DTC information with a scan tool. DTCs P0016, P0017, P0018, or P0019 should not set.

If a DTC sets, inspect for the following and repair as necessary:

* The correct installation of the camshaft sensors
* The correct installation of the crankshaft sensor
* A timing chain tensioner condition
* An incorrectly installed timing chain
* Excessive play in the timing chain
* A mechanical cam actuator that is stuck in the full advance or retard position.
* A timing chain that jumped teeth
* A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC) on the crankshaft

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Timing Chain Alignment Diagram Locations
* Camshaft Timing Drive Components Cleaning and Inspection 67. Camshaft Timing Drive Components Cleaning and Inspection
* Crankshaft and Bearing Cleaning and Inspection Overhaul