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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1650 Or DTC P1651 >> Diagnostic Procedures

Diagnostic Procedures

    NOTE: Steering wheel must not be turned during KOER self-test.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.

  2. Verify Electrical Function

    Start enigne. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. View PSP PID while turning steering wheel back and forth. If PSP PID does not indicate Low/High or High/Low, go to next step. If PSP PID indicates Low/High or High/Low, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS .

  3. Check For PSP Switch Cycling

    Disconnect PSP switch. Install a fused jumper wire between PSP switch harness connector terminals. Start engine. Record PSP PID reading. Access PID/DATA MONITOR AND RECORD. Remove fused jumper wire and record PSP PID reading. Turn ignition off. If PSP PID does not change from high to low, go to next step. If PSP PID changes from high to low, replace PSP switch. After repair, go to step  6.

  4. Check Continuity Of PSP Circuits

    Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of PSP circuit between breakout box terminal No. 31 and PSP switch harness connector (Yellow/Light Green wire). Measure resistance of SIG RTN circuit between breakout box terminal No. 91 and PSP switch harness connector (Orange wire). If each resistance reading is less than 5.0 ohms, go to next step. If each resistance reading is not as specified, repair open circuit. See WIRING DIAGRAMS article. After repair, go to step  6.

  5. Check PSP Circuit For Short

    Measure resistance between breakout box terminals No. 31 (PSP) and No. 91 (SIG RTN). Measure resistance between ground and breakout box terminal No. 31 (PSP). If either resistance reading is less than 10,000 ohms, repair short in harness. After repair, go to next step. If either resistance reading is not as specified, replace PCM. After repair, go to next step.

  6. Verify Trouble Shooting Of DTCs Completed

    Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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