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P1495 (DTC 183)

DTC 183 LDP SOLENOID ELECTRICAL MALFUNCTION (General Scan Tool Code No. P1495)

DTC 183 can be set under any of the following conditions:
^ Open or short in the LDP solenoid wiring
^ Electrical fault in the LDP solenoid
^ PCM failure





DTC 183 Diagnosis

It is important to read and understand the EVAP system information before attempting diagnosis.

Description
When the ignition key is turned to ON, the PCM checks for DTC 183.

IMPORTANT
Before beginning this procedure, repair all vehicle conditions for DTCS that are not related to the EVAP system except DTC 18 ("Purge Solenoid Electrical Fault"). If more than one EVAP system DTC is set, diagnose and repair in the following order:
(1) DTC 183 (P1495)
(2) DTC 184 (P1494)
(3) DTC 187 (P1486)
(4) DTCs 160/161 (P0442/P0455)

NOTE:
If DTC 18 is also present, refer to Step 7b(2), for troubleshooting information.

Equipment Required:

^ Digital Volt Ohmmeter (DVOM)
^ MUT-II Scan Tool
^ Adapter Harness MB991545
^ Test light

1. Connect the MUT-II scan tool and adapter harness MB991545.

2. Turn the ignition key to ON.





3. Activate the LDP solenoid by following the MUT-II selection sequence.





4. Place your hand on the LDP (under the car, on the front passenger side). You should feel a light cycling tapping as the LDP activates.

a. If the cycling tapping is felt, the LDP solenoid is functioning and the condition that caused DTC 183 to set may not be present at this time. Try to duplicate the condition by inspecting and wiggling the associated wiring harness and connectors for signs of damage. Repair or replace the wiring harness as necessary. Then go to the Readiness Test of this bulletin.

b. If the cyclic tapping is not felt, there is a concern with the LDP circuit or its components. Go to Step 5.





5. Turn the ignition key to OFF. Disconnect and inspect the LDP connector A-109 and its terminals. Check for corrosion, bent pins, backed-out pins, etc.

a. If no damage is found, reconnect connector A-109 and go to Step 6.

b. If damage is found, repair or replace as necessary. Then repeat Steps 3 and 4 to confirm proper LDP operation.

- If the LDP operates, go to the Readiness Test of this bulletin.

- If the LDP does not operate, go to Step 6.

6. Turn the ignition key to ON. Enter LDP Hold Mode to activate the LDP solenoid for the voltage testing in this procedure.





To enter LDP Hold Mode, follow the MUT-II selection sequence.





7. Using a voltmeter, test for voltage between terminal 2 (B-W) of LDP connector A-109 and ground. Do not disconnect the connector. Backprobe the B-W wire at terminal 2. The voltage reading should be within one volt of battery voltage.

a. If within one volt of battery voltage, this indicates that the voltage supply to terminal 2 is OK. Go to Step 8.

b. If not within one volt of battery voltage, the voltage supply to the LDP is not sufficient to activate the LDP solenoid. Check for DTC 18 "Purge Solenoid Electrical Fault."





(1) If DTC 18 is not set, the B-W wire between the LDP and splice 52 may be damaged. Repair or replace the wiring harness as necessary. Then go to the Readiness Test of this bulletin.

(2) If DTC 18 is set, check for damage between splice 52 and the ignition switch. Check the terminal pins, L/R wire, B/W wire, and the junction block connector. Repair or replace the wiring harness or junction block as necessary. Then go to the Readiness Test of this bulletin.





8. Using a voltmeter, test for voltage between terminal 3 (R/Y wire) of LDP connector A-109 and ground. Do not disconnect the connector. Backprobe at terminal 3.

a. If the voltage reading is less than one volt, go to Step 13.

b. If the voltage reading is more than one volt, this indicates that either the PCM wiring or the PCM itself is not providing proper ground for the LDP solenoid. Go to Step 9.





9. Turn the ignition key to OFF. Disconnect PCM connector A-107 and inspect terminal 77 for damage and corrosion.

a. If damage or corrosion is found, repair or replace the wiring harness as necessary. Then go to the Readiness Test of this bulletin.

b. If no damage or corrosion is found, go to Step for further LDP circuit inspection to determine why the LDP solenoid is not operating.

10. Disconnect LDP connector A-109. Measure the resistance between terminal 77 of PCM connector A-107 and terminal 3 of LDP connector A-109.

a. If the resistance reading is less than one ohm, go to Step 11.

b. If the resistance reading is one ohm or greater, inspect connectors A-109, B-76, B-63, and A-107, and the associated wiring. Repair or replace the wiring harness as necessary. Then go to the Readiness Test of this bulletin.





11. Reconnect LDP connector A-109. Turn the ignition key to ON. Place your hand on the LDP (located on the front passenger side). Ground terminal 77 of the PCM connector A-107 with a jumper wire. You should feel a light tapping as the LDP solenoid activates.

a. If the LDP solenoid does not activate and Steps 1-10 of this procedure were properly performed, the LDP solenoid has failed. Go to Step 12.

b. It the LDP solenoid activates, clear DTCs and recheck for DTC 183.

(1) If DTC 183 is reset, this indicates that the PCM cannot ground the LDP circuit. Replace the PCM. Then go to the Readiness Test of this bulletin.

(2) If DIC 183 is not reset, the problem is intermittent. Contact Tech Line for further troubleshooting instructions.





12. With the ignition key turned to ON, enter LDP Hold Mode as described in Step 6. Connect a test light to B+ and probe terminal 3 of LDP connector A-109.

a. If the test light illuminates, replace the LDP. Then go to the Readiness Test of this bulletin.

b. If the test light does not illuminate, replace both the LDP and the PCM. Then go to the Readiness Test of this bulletin.





13. (From Step 8a.) Check for a short to ground as follows: Turn the ignition key to OFF. Disconnect LDP connector A-109 and PCM connector A-107. Connect one lead of the DVOM to terminal 77 (R-Y) of PCM connector A-107 and the other DVOM lead to ground and measure the resistance.

a. If the resistance reading is infinite, go to Step 14.

b. If the resistance reading is not infinite, this indicates there is a short to ground. Repair or replace the wiring harness as necessary. Then go to the Readiness Test of this bulletin.





14. The ignition key should be OFF and LDP connector A-109 disconnected. Measure the resistance of the LDP solenoid coil by placing one lead of the DVOM on terminal 2 and the other lead on terminal 3 of the LDP.
NOTE:
The LDP resistance specification depends on the LDP part number (located on top of the LDP solenoid):

^ For LDPs with part number 4669306AB, the resistance reading should be 12 - 20 ohms.

^ For LDPs with a part number other than 4669306AB, the resistance reading should be 20 - 30 ohms.

a. If the resistance reading is within specification, go to Step 15.

b. If the resistance reading is not within specification, replace the LDP and reconnect LDP connector A-109. Then activate the LDP solenoid and check its operation as described in Steps 3 and 4 of DTC 183.

- If the LDP solenoid operates, go to the Readiness Test of this bulletin.

- If the LDP solenoid does not operate, replace the PCM, since it was probably damaged by a high current condition caused by the old LDP.

15. Reconnect LDP connector A-109 and PCM connector A-107. Erase DTCs and confirm that EVAP Leak Detection Test conditions are met (see page 5). Recheck for diagnostic trouble codes. If DTC 183 resets, replace the PCM. Then go to the Readiness Test of this bulletin.
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