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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic Tests >> Test TC-19A - EVAP Purge Solenoid Circuit (DTC 31)

Test TC-19A - EVAP Purge Solenoid Circuit (DTC 31)

WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAM  section.
  1. Using scan tool, erase DTCs. Using scan tool, actuate Evaporative (EVAP) purge solenoid. Using scan tool, read DTCs. If scan tool displays EVAP PURGE SOLENOID CIRCUIT, go to step 5). If scan tool does not display EVAP PURGE SOLENOID CIRCUIT, condition required to set DTC is not present at this time. Go to next step.
  2. EVAP PURGE SOLENOID CIRCUIT DTC sets if EVAP purge solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted EVAP purge solenoid, open EVAP purge solenoid Dark Blue wire, open or shorted EVAP purge solenoid Pink/Black wire, or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
  4. Using scan tool, read DTCs. EVAP purge solenoid actuation test should still be running. Wiggle wiring harness from EVAP purge solenoid to PCM. If EVAP PURGE SOLENOID CIRCUIT DTC returns, repair wiring harness as necessary. Perform TEST VER-2. If EVAP PURGE SOLENOID CIRCUIT DTC does not return, see INACTIVE DTC CONDITION . Perform TEST VER-2.
  5. Turn ignition off. Disconnect EVAP purge solenoid connector. Turn ignition on. Put scan tool in voltmeter mode. Using scan tool, check voltage on solenoid connector Dark Blue wire. If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of Pink/Black wire between EVAP purge solenoid connector and PCM connector terminal No. 52. If resistance is more than 5 ohms, repair open Pink/Black wire. Perform TEST VER-2.
  7. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance on PCM connector terminal No. 52 (Pink/Black wire). If resistance is less than 5 ohms, repair short to ground in Pink/Black wire. Perform TEST VER-2.
  8. If resistance is more than 5 ohms, reconnect EVAP purge solenoid connector. Turn ignition on. Put scan tool in voltmeter mode. Using scan tool, check voltage on PCM connector terminal No. 52 (Pink/Black wire). If voltage is less than 10 volts, replace EVAP purge solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.
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