DTC P0660 [AJ]

BME010200600201

DTC P0660

IMCC circuit malfunction

DETECTION CONDITION

• PCM monitors input voltages from IMCC actuator while engine running. If voltage at PCM terminal 28 remains low or high, PCM determines that IMCC actuator circuit has a malfunction.
Diagnostic support note
• This is an intermittent monitor (Other).
• MIL does not come on.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is not available.
• DTC is not stored in the PCM memory.

POSSIBLE CAUSE

• IMCC actuator malfunction
• Connector or terminal malfunction
• Short to ground in wiring between IMCC actuator terminal B and PCM terminal 28
• Open circuit in wiring between main relay terminal D and IMCC actuator terminal A
• Open circuit in wiring between IMCC actuator terminal B and PCM terminal 28
• Short to power circuit between IMCC actuator terminal B and PCM terminal 28
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
2
CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN
• Start engine.
• Increase engine speed above 3,800 rpm.
• Is the PENDING CODE same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
3
INSPECT IMCC ACTUATOR CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the IMCC actuator connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there malfunction?
Yes
Repair or replace the terminal, then go to Step 10.
No
Go to the next step.
4
INSPECT IMCC ACTUATOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch to the On position (Engine off).
• Measure the voltage between IMCC actuator terminal A (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to Step 10.
5
INSPECT IMCC ACTUATOR CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch off.
• Measure the voltage between IMCC actuator terminal B (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for short to power supply, then go to Step 10.
No
Go to the next step.
6
INSPECT IMCC ACTUATOR CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between IMCC actuator terminal B (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 10.
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection at terminal 28. (such as damaged/pulled-out pins, corrosion).
• Is there malfunction?
Yes
Repair the terminal, then go to Step 10.
No
Go to the next step.
8
INSPECT IMCC ACTUATOR CONTROL CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for continuity between IMCC actuator terminal B (wiring harness-side) and PCM terminal 28.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to Step 10.
9
INSPECT IMCC ACTUATOR MALFUNCTION
• Perform IMCC actuator inspection.
• Is the IMCC actuator normal?
Yes
Go to the next step.
No
Replace the IMCC actuator, then go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P0660 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.
• Start the engine.
• Increase engine speed above 3,800 rpm.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.