P0443-EVAP PURGE SOLENOID CIRCUIT





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO VOLTAGE
(K70) EVAP PURGE RETURN CIRCUIT SHORTED TO VOLTAGE
(K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND
EXCESSIVE RESISTANCE IN THE (K52) EVAP PURGE CONTROL CIRCUIT
EXCESSIVE RESISTANCE IN THE (K70) EVAP PURGE RETURN CIRCUIT
EVAP PURGE SOLENOID
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION

Ignition on, engine not running.
With a scan tool, select View DTCs and record the related Freeze Frame data if any DTC(s) are present.
Whether or not any DTC(s) are Active you will want to check the following items which may assist in repairing the customer's complaint successfully.
Check the vehicle's repair history.
If the vehicle has a repair history that pertains to the customer's current complaint, review the repair.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any service bulletin(s) related to the customer's complaint or DTC(s).
If a service bulletin applies, follow the instructions per the service bulletin.

Choose the following scenario that best applies.

The service bulletin repaired the customer's complaint.


A DTC is present, no service bulletins apply, or the service bulletin didn't repair the customer's complaint.

2. ACTIVE DTC

Ignition on, engine not running.
With the scan tool, Select View DTCs.

Is the DTC Active at this time?

Yes


No

3. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO VOLTAGE



Turn the ignition off.
Disconnect the EVAP Purge Solenoid harness connector.
Disconnect the C3 PCM harness connector.
Ignition on, engine not running.
Measure the voltage of the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.

Is there any voltage present?

Yes


No

4. (K70) EVAP PURGE RETURN CIRCUIT SHORTED TO VOLTAGE



Measure the voltage of the (K70) Evap Purge Return circuit in the Evap Purge Solenoid harness connector.

Is there any voltage present?

Yes


No

5. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND



Turn the ignition off.
Measure the resistance between ground and the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.

Is the resistance below 100 ohms?

Yes


No

6. (K52) EVAP PURGE CONTROL CIRCUIT OPEN


CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K52) Evap Purge Control circuit from the Evap Purge Solenoid harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes


No

7. (K70) EVAP PURGE RETURN CIRCUIT OPEN


CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K70) Evap Purge Return circuit from the EVAP Purge Solenoid harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes


No

8. EVAP PURGE SOLENOID



Connect the C3 PCM harness connector.
Ignition on, engine not running.
With the scan tool, actuate the Evap Purge Solenoid control to the ON (100%) position.

NOTE: The DTC needs to be cleared before actuating the Purge Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate.


Using a 12-volt test light connected to ground, check the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the B- (ground).



Is the test light illuminated and bright?

Yes


No

9. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.


Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes


No