DTC P0076

DTC P0076	VDI solenoid valve control circuit low input
DETECTION CONDITION	The PCM monitors the VDI solenoid valve control voltage when the PCM turns the VDI solenoid valve off. If the control voltage is low, the PCM determines that the VDI solenoid valve control circuit voltage is low. Diagnostic support note This is a continuous monitor (other). The MIL does not illuminate. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is not available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	VDI solenoid valve connector or terminals malfunction VDI solenoid valve malfunction Short to ground or open circuit in VDI solenoid valve power supply circuit Short to ground in wiring harness between main relay terminal C and VDI solenoid valve terminal A VDI solenoid valve related fuse malfunction Open circuit in wiring harness between main relay terminal C and VDI solenoid valve terminal A Short to ground in wiring harness between VDI solenoid valve terminal B and PCM terminal 2L PCM connector or terminals malfunction Open circuit in wiring harness between VDI solenoid valve terminal B and PCM terminal 2L PCM malfunction

VDI solenoid valve control circuit low input

DETECTION CONDITION

The PCM monitors the VDI solenoid valve control voltage when the PCM turns the VDI solenoid valve off. If the control voltage is low, the PCM determines that the VDI solenoid valve control circuit voltage is low.

Diagnostic support note

This is a continuous monitor (other).
The MIL does not illuminate.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is not available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

VDI solenoid valve connector or terminals malfunction
VDI solenoid valve malfunction
Short to ground or open circuit in VDI solenoid valve power supply circuit
- Short to ground in wiring harness between main relay terminal C and VDI solenoid valve terminal A
- VDI solenoid valve related fuse malfunction
- Open circuit in wiring harness between main relay terminal C and VDI solenoid valve terminal A
Short to ground in wiring harness between VDI solenoid valve terminal B and PCM terminal 2L
PCM connector or terminals malfunction
Open circuit in wiring harness between VDI solenoid valve terminal B and PCM terminal 2L
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	INSPECT VDI SOLENOID VALVE CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the VDI solenoid valve connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
2		No	Go to the next step.
3	INSPECT VDI SOLENOID VALVE Inspect the VDI solenoid valve. (See VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) SOLENOID VALVE INSPECTION ). Is there any malfunction?	Yes	Replace the VDI solenoid valve, then go to Step 8. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ).
3		No	Go to the next step.
4	INSPECT VDI SOLENOID VALVE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT VDI solenoid valve connector is disconnected. Turn the ignition switch to the ON position (engine off). Measure the voltage between VDI solenoid valve terminal A (wiring harness-side) and body ground. Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the VDI solenoid valve related fuse. If the fuse is melt: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deterioration: Replace the fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to Step 8.
5	INSPECT VDI SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND VDI solenoid valve connector is disconnected. Turn the ignition switch off. Inspect for continuity between VDI solenoid valve terminal B (wiring harness-side) and body ground. Is there continuity?	Yes	If the short to ground circuit could be detected: Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION ). Go to Step 8.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
6		No	Go to the next step.
7	INSPECT VDI SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT VDI solenoid valve and PCM connectors are disconnected. Turn the ignition switch off. Inspect for continuity between VDI solenoid valve terminal B (wiring harness-side) and PCM terminal 2L (wiring harness-side). Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0076 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST ). Is the PENDING CODE same as the DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
9		No	DTC troubleshooting completed.