DTC P0579 [MZI-3.7]

id0102d2870500

DTC P0579

Cruise control multi-function input circuit range/performance
DETECTION CONDITION
•  P0579 may set when the cruise control switch circuits are open, shorted to voltage or ground.
POSSIBLE CAUSE
•  Cruise control switch connector or terminal malfunction
•  Short to power supply between cruise control switch terminal B and PCM terminal 1AT
•  Short to power supply between cruise control switch terminal C and PCM terminal 1AP
•  Short to ground circuit between cruise control switch terminal B and PCM terminal 1AT
•  Short to ground circuit between cruise control switch terminal C and PCM terminal 1AP
•  PCM connector or terminal malfunction
•  Open circuit between cruise control switch terminal B and PCM terminal 1AT
•  Open circuit between cruise control switch terminal C and PCM terminal 1AP
•  Cruise control switch 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.
No
Record FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT CRUISE CONTROL SWITCH CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch to off.
•  Disconnect the cruise control switch connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Are there any malfunction?
Yes
Repair or replace suspected part, then go to Step 9.
No
Go to the next step.
4
IINSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Turn the ignition switch to the ON position (Engine off).
•  Measure the voltage between the following terminals:
―  Cruise control switch terminal B and body ground
―  Cruise control switch terminal C and body ground
•  Are there voltage B+?
Yes
Repair or replace suspected part, then go to Step 9.
No
Go to the next step.
5
INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between the following terminals:
―  Cruise control switch terminal B and body ground
―  Cruise control switch terminal C and body ground
•  Are there continuity?
Yes
Repair or replace suspected part, then go to Step 9.
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, corrosion).
•  Are there any malfunction?
Yes
Repair or replace suspected part, then go to Step 9.
No
Go to the next Step.
7
INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR OPEN
•  Disconnect the PCM connector.
•  Inspect for continuity between the following terminals:
―  Cruise control switch terminal B and PCM terminal 1AT
―  Cruise control switch terminal C and PCM terminal 1AP
•  Are there continuity?
Yes
Go to the next step.
No
Repair or replace suspected part, then go to Step 9.
8
INSPECT CRUISE CONTROL SWITCH
•  Inspect the cruise control switch.
•  Is there malfunction?
Yes
Replace the cruise control switch, then go to the next step.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0579 HAS BEEN COMPLETED
•  Verify that all disconnected connectors are reconnected.
•  Turn the ignition switch to the ON position (Engine off).
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the “KOEO and KOER self-test”.
•  Retrieve DTCs using the M-MDS.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7].)
No
Troubleshooting completed.