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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  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. NOTE: Steering wheel must be turned during KOER Self-Test.
  2. Verify Electrical Function -  With KOER, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. View PSP PID while turning steering wheel left and right. If PSP PID does not indicate low/high and high/low, go to next step. If PSP PID indicates low/high and high/low, go to INTERMITTENT  testing under SYSTEM TESTS.
  3. Check For PSP Switch Cycling -  Disconnect PSP switch 2-pin harness connector or remove shorting bar. Install a fused jumper wire between PSP switch harness connector terminals. With KOER, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Record PSP PID reading. Remove fused jumper wire. Record PSP PID reading. Turn ignition off. If PSP PID changes from high to low, replace faulty PSP switch or shorting bar. After repair, go to step  6 . If PSP did not change from high to low, go to next step.
  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 (Yellow/Light Green wire) between breakout box terminal No. 31 and PSP switch harness connector. See Fig 1 . Record reading. Measure resistance of SIG RTN circuit (Gray/Red wire) between breakout box terminal No. 91 and PSP switch harness connector. Record reading. If each resistance reading is less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  6 .
    Fig 1: Identifying PSP Switch Harness Connector Circuits
    G00155560Courtesy of MAZDA MOTORS CORP.
  5. Check PSP Circuit For Short -  Measure resistance between breakout box terminals No. 31 (PSP circuit) and No. 91 (SIG RTN circuit). Record reading. Measure resistance between breakout box terminal No. 31 (PSP circuit) and chassis ground. Record reading. 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 10,000 ohms or more, replace faulty PCM. After repair, go to next step.
  6. Verify Trouble Shooting Of DTCs Completed -  Reconnect all electrical connectors. Using scan tool, clear DTC from PCM memory. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM and repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTC is present, trouble shooting is complete.
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