1997 Chevy Venture MAF sensor

Tiny
LMORRISEY
  • MEMBER
  • 1997 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 143,000 MILES
Computer codes P0102 and P1655 keep showing up. I have already changed the MAF and the code keep coming up
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Monday, March 22nd, 2010 AT 2:48 PM

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Tiny
DAVE H
  • EXPERT
DTC P1655 - EVAP PURGE SOLENOID CONTROL CIRCUIT
NOTE:For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION.

Circuit Description
Output Driver Modules (ODM) are used by PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including EVAP purge solenoid driver circuit, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM "B" output 5 (EVAP purge solenoid driver circuit) detects an improper voltage level, DTC P1655 is set.
Conditions required to set DTC are:
Ignition is on.
An improper voltage level has been detected on EVAP purge solenoid driver circuit.
Conditions present for at least 30 seconds.
Diagnostic Procedures
Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector EVAP purge solenoid driver circuit. If voltage is near battery voltage, go to next step. If not, go to step 6).
Using DVOM in 10-amp scale, check current between engine ground and EVAP purge solenoid driver circuit for 2 minutes. If current remains 0.1-1.5 amps, go to step 11). If current does not remain as specified, go to next step.
Turn ignition off. With PCM connectors still disconnected, disconnect EVAP purge solenoid connector. Turn ignition on. Using DVOM, check voltage between engine ground and EVAP purge solenoid driver circuit. If voltage reading is zero volts, go to step 10). If voltage reading is not zero volts, go to next step.
Locate and repair short to voltage in EVAP purge solenoid driver circuit. After repairs, go to step 16).
Check EVAP purge solenoid ignition feed fuse. If fuse is blown, go to next step. If fuse is okay, go to step 8).
Locate and repair short to ground in EVAP purge solenoid ignition feed circuit. Replace fuse and go to step 16).
Disconnect EVAP purge solenoid connector. Turn ignition on, with engine off. Check voltage between engine ground and EVAP purge solenoid ignition feed circuit. If voltage is near battery voltage, go to next step. If voltage is not near battery voltage, go to step 13).
Check EVAP purge solenoid driver circuit for open or short to ground. If a problem is found, repair as necessary. After repairs, go to step 16). If no problem is found, go to next step.
Check EVAP purge solenoid driver and ignition feed circuits for faulty connection at EVAP purge solenoid and PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to step 14).
Turn ignition off. Reconnect PCM connectors. Disconnect EVAP purge solenoid connector. Turn ignition on. Connect a test light between EVAP purge solenoid harness connector EVAP purge solenoid driver and ignition feed circuits. Using scan tool, cycle EVAP purge solenoid on and off. If test light flashes on and off, see DIAGNOSTIC AIDS. If test light does not flash on and off, go to next step.
Check EVAP purge solenoid driver circuit for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to step 15).
Locate and repair open EVAP purge solenoid ignition feed circuit. After repairs, go to step 16).
Replace EVAP purge solenoid. After replacing EVAP purge solenoid, go to step 16).
Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P1655. If scan tool displays DTC P1655 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1655 FAILED THIS IGN, repair is complete.
Diagnostic Aids
Check for faulty connections or damaged harness. Disconnect PCM connector. Turn ignition on. Connect a DVOM between engine ground and PCM harness connector EVAP purge solenoid driver circuit. Observe DVOM while moving all related harness and connectors. A change in voltage display indicates fault location.
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Monday, March 29th, 2010 AT 7:22 PM

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