DTC P0660 VICS solenoid valve circuit malfunction
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins availability.
• Is any related repair information available?
Yes Perform repair or diagnosis according to available repair
information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 CLASSIFY INTERMITTENT CONCERN OR
CONTINUOUS CONCERN
• Start engine.
• Increase engine speed above 4,750 rpm.
• Is PENDING CODE same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See 01–03B–4 INTERMITTENT CONCERN
TROUBLESHOOTING [FS].)
3 CLASSIFY OPEN CIRCUIT OR SHORT TO
GROUND MALFUNCTION
• Disconnect VICS solenoid valve tube at
solenoid side that connects to VICS solenoid
valve.
• Connect vacuum pump to VICS solenoid valve.
• Apply vacuum.
• Wait for 5 seconds.
• Is vacuum maintained?
Yes Go to Step 5.
No Go to next step.
4 INSPECT PASSAGE CONTROL OF VICS
SOLENOID VALVE
• Turn ignition key to OFF.
• Disconnect VICS solenoid valve connector.
• Apply vacuum and wait for 5 seconds.
• Is vacuum maintained?
Yes Repair or replace harness between solenoid valve terminal
B and PCM terminal 19 for short to ground, then go to Step
10.
No Replace VICS solenoid valve, then go to Step 10.
5 INSPECT VICS SOLENOID VALVE
CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Check for poor connection (damaged/pulledout pins, corrosion, etc.).
• Is there malfunction?
Yes Repair or replace terminal, then go to Step 10.
No Go to next step.
6 INSPECT VICS SOLENOID VALVE
• Measure resistance between VICS solenoid
valve terminals (part-side).
• Is resistance within 22—26 ohms?
Yes Go to next step.
No Replace VICS solenoid valve, then go to Step 10.
7 INSPECT VICS SOLENOID VALVE POWER
SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Measure voltage between VICS solenoid valve
terminal A (harness-side) and body ground.
• Is voltage B+?
Yes Go to next step.
No Repair or replace harness for open, then go to Step 10.
8 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Check for poor connection at terminal 19.
(damaged/pulled-out pins, corrosion, etc.).
• Is there malfunction?
Yes Repair terminal, then go to Step 10.
No Go to next step.
9 INSPECT VICS SOLENOID VALVE CONTROL
CIRCUIT FOR OPEN CIRCUIT
• Connect VICS solenoid valve connector.
• Connect breakout box with PCM disconnected.
• Turn ignition key to ON (Engine OFF).
• Measure voltage between breakout box
terminal 19 and body ground.
• Is voltage B+?
Yes Go to next step.
No Repair or replace harness for open, then go to next step.
10 VERIFY TROUBLESHOOTING OF DTC P0660
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from PCM memory using WDS or
equivalent.
• Start engine.
• Increase engine speed above 4,750 rpm.
• Is PENDING CODE of same DTC present?
Yes Replace PCM, then go to next step.
No Go to next step.
11 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See 01–02B–9 AFTER REPAIR
PROCEDURE [FS].)
• Is there any DTC present?
Yes Go to applicable DTC inspection.
(See 01–02B–15 DTC TABLE [FS].)
No Troubleshooting completed.
This is from the service manual. Website is floptical.net/mazda
