Variable Valve Timing Solenoid: Testing and Inspection

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Procedure for malfunction A
WITH CONSULT
1) Turn ignition switch "ON".

2) Select "DATA MONITOR" mode with CONSULT.
3) Wait at least 5 seconds.

OR

WITH GST
1) Turn ignition switch "ON" and wait at least 5 seconds.
2) Select "MODE 3" with GST.

OR

WITH NO TOOLS
1) Turn ignition switch "ON", wait at least 5 seconds.
2) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the VTC. During this check, a DTC might not be confirmed.

Procedure for malfunction B
WITH CONSULT
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF".







3) Disconnect throttle position sensor harness connector.
4) Disconnect vacuum hose from fuel pressure regulator and then connect the hose to vacuum gauge.




5) Turn ignition switch "ON" and select "VALVE TIMING SOL" in "ACTIVE TEST" mode with CONSULT.
6) Start engine and race it to 2,000 - 3,000 rpm 2 or 3 times.
7) Raise the idle speed (base idle) by turning the idle adjusting screw until intake manifold vacuum pressure becomes stable (Approx. 1,200 rpm).




8) Make sure that the difference of vacuum pressure is more than 1.3 kPa (10 mm Hg, 0.39 in Hg) when alternating "ON" and "OFF" with CONSULT.

Reference Values
VTC "ON": Approximately -77.3 kPa (-550 mmHg, -21.65 inHg)
VTC "OFF": Approximately -76.0 kPa (-570 mmHg, -22.44 inHg)

OR

WITH NO TOOLS
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF:.
3) Disconnect throttle position sensor harness connector.
4) Disconnect vacuum hose from fuel pressure regulator and then connect the hose to vacuum gauge.
5) Disconnect VTC solenoid valve harness connector.
6) Start engine and race it to 2,000 - 3,000 rpm 2 or 3 times.




7) Raise the idle speed (base idle) by turning the idle adjusting screw until intake manifold vacuum pressure becomes stable (Approx. 1,200 rpm).




8) Make sure that the vacuum pressure changes more than 1.3 kPa (10 mmHg, 0.39 inHg) when supplying the solenoid valve terminals with battery voltage.
Reference Value
Battery voltage supplied: Approx. -73.3 kPa (-550 mmHg, -21.65 inHg)
NO Battery voltage supplied: Approx. -76.0 kPa (-570 mmHg, -22.44 inHg)




WIRING DIAGRAM







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
VTC solenoid valve
1. Supply VTC solenoid valve terminals with battery voltage.




2. Make sure that inside plunger protrudes.
If NG, replace VTC solenoid valve.