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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Engine Controls - Tests W/Codes - 5.9L Gasoline) >> Self-Diagnostic Tests >> Test TC-34A - EVAP Solenoid Circuit

Test TC-34A - EVAP Solenoid Circuit

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. 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 diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Using scan tool, erase trouble codes and actuate Evaporative (EVAP) solenoid. Using scan tool, read trouble codes. If scan tool does not display EVAP SOLENOID CONTROL CIRCUIT, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays EVAP SOLENOID CONTROL CIRCUIT, go to step 5).
  2. EVAP SOLENOID CONTROL CIRCUIT trouble code sets if EVAP solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted EVAP solenoid, open EVAP solenoid power supply circuit (Dark Blue wire on AB body; Light Green/Black wire on BR body), open or shorted EVAP solenoid control circuit (Pink/Black wire) or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors. 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 trouble codes. EVAP solenoid actuation test should still be running. Wiggle wiring harness from EVAP solenoid to PCM. If EVAP SOLENOID CONTROL CIRCUIT trouble code returns, repair wiring harness. Perform TEST VER-2. If EVAP SOLENOID CONTROL CIRCUIT trouble code does not return, see INACTIVE TROUBLE CODE CONDITION  . Perform TEST VER-2.
  5. Turn ignition off. Disconnect EVAP solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on EVAP solenoid connector, power supply circuit (Dark Blue wire on AB body; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue 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 EVAP solenoid control circuit (Pink/Black wire) between EVAP solenoid connector and PCM connector terminal No. 52. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Pink/Black wire. Perform TEST VER-2.
  7. Put scan tool in ohmmeter mode. Using scan tool, check resistance on PCM connector terminal No. 52 (Pink/Black wire). If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire. Perform TEST VER-2.
  8. Reconnect EVAP solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 52 (Pink/Black wire). If voltage is less than 10 volts, replace EVAP solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.
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