LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0090: Pressure Regulator Control Solenoid Valve Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  9.
  2. Classify Intermittent Concern Or Continuous Concern -  Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off, then start engine. Using scan tool, check for PENDING CODE. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0090 is present, go to next step. If DTC P0090 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Classify Open Circuit Or Short To Ground Malfunction -  Disconnect manifold vacuum hose from PRC solenoid valve. Connect vacuum pump to PRC solenoid valve and apply vacuum. If vacuum does not hold for 5 seconds, go to next step. If vacuum holds for 5 seconds, go to step  5.
  4. Inspect Passage Control Of PRC Solenoid Valve -  Turn ignition off. Disconnect PRC solenoid valve 2-pin harness connector. Apply vacuum. If vacuum holds, repair short circuit to ground in Black/Light Green wire between PRC solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 95. After repair, go to step  10. If vacuum does not hold, replace PRC solenoid valve. After repair, go to step  10.
  5. Inspect PRC Solenoid Valve Connector For Poor Connection -  Turn ignition off. Disconnect PRC solenoid valve 2-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If any problem is found, repair or replace terminal as necessary. After repair, go to step  10.
  6. Inspect PRC Solenoid Valve -  Measure resistance between PRC solenoid valve terminals. If resistance reading is 22-26 ohms, go to next step. If resistance reading is not as specified, replace PRC solenoid valve. After repair, go to step  10.
  7. Inspect PRC Solenoid Valve Power Supply Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between ground and PRC solenoid valve harness connector terminal "A" (White/Red wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White/Red wire between PRC solenoid valve harness connector terminal "A" and main relay harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Go to step  10.
  8. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If any problems are found, repair or replace as necessary. After repair, go to step  10.
  9. Inspect PRC Solenoid Valve Control Circuit -  Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition on, engine off. Measure voltage between ground and PRC solenoid valve harness connector terminal "B" (Black/Light Green wire). If battery voltage is present, repair short circuit to power in Black/Light Green wire between PRC solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 95. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to next step. If battery voltage is not present, turn ignition off. Check for continuity between PRC solenoid valve harness connector terminal "B" (Black/Light Green wire) and breakout box terminal No. 95. See Figure. If continuity is present, go to next step. If continuity is not present, repair open circuit in Black/Light Green wire between PRC solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 95. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0090 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition switch off, then start engine. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0090 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0090 is not present, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
scientia non olet · About LEMON Manuals