Brand:
Toyota
Model Name:
4Runner GRN210 215 UZN210 215
Manual:
Repair Manual
Section:
1Gr-Fe Engine Control System
Title:
Sfi System
DTC P0010 Camshaft Position "A" Actuator Circuit (Bank 1)
DTC P0020 Camshaft Position "A" Actuator Circuit (Bank 2)
- HINT:
- These DTCs relate to the Oil Control Valve (OCV).
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, OCV and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure applied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature.The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.
| DTC No. | DTC Detection Conditions | Trouble Areas |
| P0010 | Open or short in OCV circuit (1 trip detection logic) |
|
| P0020 | Open or short in OCV circuit (1 trip detection logic) |
|
MONITOR DESCRIPTION
The ECM optimizes the valve timing using the VVT system to control the intake camshaft. The VVT system includes the ECM, the OCV and the VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure applied to the VVT controller. The VVT controller can advance or retard the intake camshaft.After the ECM sends the target duty-cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty-cycle. The ECM determines the existence of a malfunction and sets a DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.
MONITOR STRATEGY
| Related DTCs | P0010: VVT OCV (Bank 1) range check P0020: VVT OCV (Bank 2) range check |
| Required sensors / components (Main) | VVT OCV |
| Required sensors / components (Related) | - |
| Frequency of operation | Continuous |
| Duration | 1 second |
| MIL operation | Immediate |
| Sequence operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever these DTCs are not present | None |
| Starter | OFF |
| Ignition switch | ON |
| Time after ignition switch OFF to ON | 0.5 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
| One of the following conditions is met: | Condition 1, 2 or 3 |
| 1. All of the following conditions are met: | Condition (a), (b) and (c) |
| (a) Battery voltage | 11 to 13 V |
| (b) Target duty ratio | Less than 70 % |
| (c) Output signal duty ratio | 100 % or more |
| 2. All of the following conditions are met: | Condition (d), (e) and (f) |
| (d) Battery voltage | 13 V or more |
| (e) Target duty ratio | Less than 80 % |
| (f) Output signal duty ratio | 100 % or more |
| 3. All of the following conditions are met: | Condition (g) and (h) |
| (g) Current cut status | Not cut |
| (h) Output signal duty ratio | 3 % or less |
COMPONENT OPERATING RANGE
| OCV current | 3 % to 100 % |
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- If DTC P0010 is displayed, check the bank 1 VVT system circuit.
- Bank 1 refers to the bank that include cylinder No. 1.
- If DTC P0020 is displayed, check the bank 2 VVT system circuit.
- Bank 2 refers to the bank that does not includes cylinder No. 1.
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV)
Connect the intelligent tester to the DLC3.
Start the engine and turn the tester on.
Warm up the engine and idle it.
Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
Check the engine speed while operating the Oil Control Valve (OCV) using the tester.
- Standard:
Tester Operations Specified Conditions OCV OFF Normal engine idle speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON)
| CHECK FOR INTERMITTENT PROBLEMS | |||
| NG | |
 |
2.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV SIGNAL)
Disconnect the C2 or C3 OCV connector.
While idling, check the waveform between the terminals of the C2 or C3 OCV connector using an oscilloscope.
- OK:
Tester Connections Specified Conditions + (C2-1) - - (C2-2) Correct waveform appears + (C3-1) - - (C3-2) Correct waveform appears
Reconnect the OCV connector.
| REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY | |||
| NG | |
|
3.INSPECT ECM (OCV SIGNAL)
Inspect the ECM using an oscilloscope.
While idling, check the waveform between the terminals of the E6 ECM connector.
- OK:
Tester Connections Specified Conditions OC1+ (E6-17) - OC1- (E6-16) Correct waveform appears OC2+ (E6-15) - OC2- (E6-14) Correct waveform appears
| REPLACE ECM | |||
| OK | |
 | |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (OCV SIGNAL OPEN CIRCUIT) | |