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Home >> Mazda >> 2001 >> B2500 SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> System Tests >> Test DT: Power Steering Pressure Sensor >> Diagnostic Aids

Diagnostic Aids

Perform this test when directed by QUICK TEST or other test procedures. This test is intended to diagnose the following:

  1. 1) KOER DTC P1550: Verify Operator Interaction

    DTC P1550 indicates PSP sensor signal fell below minimum or exceeded maximum calibrated limit during self-test. Possible causes for this fault are:
    • Damaged PSP Sensor
    • Faulty Powertrain Control Module (PCM)

    Ensure steering wheel was turned at least 1/2 turn within 30 seconds of starting KOER ON-DEMAND SELF-TEST . If steering wheel was turned, repair any problems with power steering system that are present. If no power steering problems are present, go to next step. If steering wheel was not turned, repeat QUICK TEST .

  2. 2) KOEO & KOER DTC P0552 & P0553 Or DTC P1550: Check Voltage Between VREF & SIG RTN At PSP Sensor

    DTC P0552 indicates PSP sensor circuit is open or shorted to ground. DTC P0553 indicates PSP sensor circuit is shorted to VPWR. Possible causes for these faults are:
    • Open Or Shorted SIG RTN Circuit
    • Open Or Shorted VREF Circuit
    • Open Or Shorted PSP Sensor Signal Circuit

    Turn ignition switch to OFF position. Disconnect PSP sensor harness connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Using a DVOM, measure voltage between PSP sensor harness connector VREF and SIG RTN terminals. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to TEST C, step  1).

  3. 3) Check PSP Sensor Operation

    Turn ignition switch to OFF position. Connect jumper wire for VREF circuit between PSP sensor connector and PSP sensor harness connector. See Fig 1. Connect jumper wire for SIG RTN circuit between PSP sensor connector and PSP sensor harness connector. Start engine and allow to idle. Using a DVOM, measure voltage of PSP circuit between chassis ground and PSP sensor connector. See Fig 1. Turn steering wheel at least one-half turn right and left. If voltage is .3-4.7 volts, go to next step. If voltage is not .3-4.7 volts, replace PSP sensor.
    Fig 1: Testing PSP Sensor Operation
    G00035648Courtesy of FORD MOTOR CO.

  4. 4) Check PSP Sensor Circuit For Open

    Turn ignition switch to OFF position. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Ensure PSP sensor is disconnected. Using a DVOM, measure resistance of PSP circuit between PSP sensor harness connector terminal and PCM harness connector terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PSP circuit.

  5. 5) Check PSP Sensor Circuit For Short To Power

    Turn ignition switch to ON position. Using a DVOM, measure voltage between chassis ground and PSP sensor harness connector PSP terminal. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to VPWR in PSP circuit.

  6. 6) Check PSP Circuit For Short To VREF, SIG RTN & Ground In Harness

    Using a DVOM, measure resistance between PSP sensor harness connector PSP and VREF terminals, PSP and SIG RTN terminals, and between PSP terminal and chassis ground. If all resistance measurements are more than 10 k/ohms, replace PCM. If any resistance measurement is 10 k/ohms or less, repair short to ground in affected circuit.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

  7. 10) Continuous Memory DTC P0552 & P0553: Check For Intermittent Circuits To PSP Sensor

    DTC P0552 indicates PSP sensor circuit is open or shorted to ground. DTC P0553 indicates PSP sensor circuit is shorted to VPWR. Possible causes for these faults are:
    • Open Or Shorted SIG RTN Circuit
    • Open Or Shorted VREF Circuit
    • Open Or Shorted PSP Sensor Signal Circuit

    Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, select PSP V PID from PID/DATA MONITOR & RECORD. Observe PSP V PID voltage for indication of fault while shaking and bending PSP sensor wiring harness and connector. Tap lightly on PSP sensor to simulate road shock. An indication of fault is a sudden change in PSP V PID voltage. If a fault is indicated, isolate and repair as necessary. If no fault is indicated, fault is unable to be duplicated at this time. Go to TEST Z, step  1).

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