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Home >> Mazda >> 2008 >> Tribute s Touring, FWD >> Repair and Diagnosis >> Engine Performance >> Symptom Troubleshooting (Engine Control System - Except Hybrid) >> Pinpoint Test 7: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool >> Diagnostic Procedure

Diagnostic Procedure

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
DIAGNOSTIC PROCEDURE

PINPOINT TEST 7  THE POWER STEERING CONTROL MODULE (PSCM) DOES NOT RESPOND TO THE SCAN TOOL
STEP INSPECTION ACTION
1 CHECK THE PSCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
  • Disconnect: PSCM 0613-01.
  • Connect the battery ground cable.
  • Key in ON position.
  • Measure the voltage between the PSCM 0613-01 pin 1, circuit (Y/GY), harness side and ground.
  • Is the voltage greater than 10 volts? 
 Yes GO to the next step.
No VERIFY the smart junction box (SJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2 CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN
  • Key in OFF position.
  • Measure the resistance between PSCM 0613-01 pin 2, circuit (B/V), harness side and ground.
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSCM AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN
  • Measure the resistance between the PSCM 0613-01 pin 2, circuit (W/L), harness side and the DLC D-01 pin 6, circuit (W/L), harness side; and between the PSCM 0613-01 pin 3, circuit (W), harness side and the DLC D-01 pin 14, circuit (W), harness side.
  • Are the resistances less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4 CHECK FOR CORRECT PSCM OPERATION
  • Disconnect all the PSCM connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all the PSCM connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes INSTALL a new PSCM. CLEAR the DTCs. REPEAT the network test with the scan tool.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
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