P0012 Camshaft Position Timing Over-Retarded

P0012 Engine Timing Fault Code Diagnostic Guide

General Description:

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition. The ECM controls the Oil Control Valve (OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions.

DTC Description:

ECM monitors CAM phaser error while CMP signal is normally generating and vehicle is driving in 2000 ~ 3000rpm.
If the CAM phaser does not move although ECM commands OCV duty cycle ECM determines that a faultexists and a DTC is
stored.

Possible Causes:

Engine Oil
OCV stuck
CVVT stuck

Wiring Diagram:

Visual Inspection:

Check oil level is O.K.
Check Oil and OCV is contaminated.
Check that any oil leakage is occurred around OCV.

Component Inspection:

Check OCV resistance

IG “OFF” and disconnect OCV connector.
Measure resistance between power and signal terminals of OCV. (Component Side)
Specification : 6.7 ~ 7.7 Ω

Check CAM PHASER with actuation test

Connect scantool and IG “ON”
Select “CAM PHASER INTAKE BANK 1” on the Actuation Test
Select “OIL CONTROL VALVE” on the Actuation Test
Activates “CAM PHASER INTAKE BANK 1” by pressing “START” button
Activates “OIL CONTROL VALVE” by pressing “START” button
Repeat this procedure 4 or 5 times to ensure CAM PHASER and valve control solenoid reliability