Mazda DTC P0661 Diagnostic

DTC P0661	Variable intake-air solenoid valve circuit low input
DETECTION CONDITION	• The PCM monitors the variable intake-air solenoid valve control signal at PCM terminal 2AJ. If the PCM turns variable intake-air solenoid valve off but voltage at PCM terminal 2AJ still remains low, the PCM determines that variable intake-air solenoid valve circuit has malfunction. 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. • The FREEZE FRAME DATA is not available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Variable intake-air solenoid valve malfunction • Open circuit in wiring harness between main relay and variable intake-air solenoid valve terminal B • Open circuit in wiring harness between variable intake-air solenoid valve terminal A and PCM terminal 2AJ • Short to ground in wiring harness between variable intake-air solenoid valve terminal A and PCM terminal 2AJ • Connector or terminal malfunction • PCM malfunction

DTC P0661

Variable intake-air solenoid valve circuit low input

DETECTION CONDITION

• The PCM monitors the variable intake-air solenoid valve control signal at PCM terminal 2AJ. If the PCM turns variable intake-air solenoid valve off but voltage at PCM terminal 2AJ still remains low, the PCM determines that variable intake-air solenoid valve circuit has malfunction.

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.

• The FREEZE FRAME DATA is not available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Variable intake-air solenoid valve malfunction

• Open circuit in wiring harness between main relay and variable intake-air solenoid valve terminal B

• Open circuit in wiring harness between variable intake-air solenoid valve terminal A and PCM terminal 2AJ

• Short to ground in wiring harness between variable intake-air solenoid valve terminal A and PCM terminal 2AJ

• Connector or terminal malfunction

• PCM malfunction

Diagnostic procedure


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service 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.
2		No	Go to the next step.
3	INSPECT VARIABLE INTAKE-AIR SOLENOID VALVE CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the variable intake-air solenoid valve connector. • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). • Is there malfunction?	Yes	Repair or replace the terminal, then go to Step 9.
3		No	Go to the next step.
4	INSPECT VARIABLE INTAKE-AIR SOLENOID VALVE MALFUNCTION • Perform variable intake-air solenoid valve inspection. • Is variable intake-air solenoid valve normal?	Yes	Go to the next step.
4		No	Replace the variable intake-air solenoid valve, then go to step 9.
5	INSPECT VARIABLE INTAKE-AIR SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between variable intake-air solenoid valve terminal B (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness for open, then go to Step 9.
6	INSPECT VARIABLE INTAKE-AIR SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between variable intake-air solenoid valve terminal A (wiring harness-side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for short to ground, then go to Step 9.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection at terminal 2AJ. (damaged/pulled-out pins, corrosion, etc.). • Is there malfunction?	Yes	Repair the terminal, then go to Step 9.
7		No	Go to the next step.
8	INSPECT VARIABLE INTAKE-AIR SOLENOID VALVE CONTROL CIRCUIT FOR OPEN • Inspect for continuity between variable intake-air solenoid valve terminal B (wiring harness-side) and PCM terminal 2AJ (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness for open circuit, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0661 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the WDS or equivalent. • Access RPM PID. • Increase the engine speed 4,750 rpm or more for 10 times. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. • Are any DTC present?	Yes	Go to the applicable DTC troubleshooting.
10		No	Troubleshooting completed.