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Data Link Connector Malfunction

DTC P1001 OR DTC NOT LISTED DIAGNOSTIC TROUBLE CODE CHART

DTC P1001 OR DTC NOT LISTED DATA LINK CONNECTOR (DLC) MALFUNCTION
DETECTION CONDITION
  • P1001 indicates any of the following.
    • Unable to access Continuous Memory DTCs.
    • Unable to activate KOEO or KOER Self-Test.
    • WDS or equivalent tester communication problem.
    • DTC displayed by WDS or equivalent tester not listed.
    • KOER Self-Test cannot be completed.
POSSIBLE CAUSE
  • Damaged DLC.
  • Incorrect Self-Test procedure.
  • VREF is not in specification.
  • Idle RPM out of specification.
  • Open in DLC harness circuit.
  • Short in DLC circuit or associated modules.
  • Damaged PCM power relay circuit.
  • Damaged PCM.
G04319008Courtesy of MAZDA MOTORS CORP.
DTC P1001 DIAGNOSTIC PROCEDURE

DTC P1001 DATA LINK CONNECTOR (DLC) MALFUNCTION
STEP INSPECTION ACTION
1 CHECK THE DIAGNOSTIC TOOL CONNECTOR
  • Inspect the WDS or equivalent tester pins for damage.
  • Are the pins OK? 
 Yes Go to next step.
No REPAIR the WDS or equivalent tester connector.
CLEAR the DTCs. REPEAT the self-test.
CARRY OUT the data link diagnostics test.
2 CHECK THE DLC FOR DAMAGE
  • Key OFF.
  • Inspect the DLC pins for damage.
  • Are the pins OK? 
 Yes Go to next step.
No REPAIR the DLC. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
3 CHECK THE VOLTAGE TO THE DIAGNOSTIC TOOL
  • Key ON, Engine OFF (KOEO).
  • Measure the voltage between the DLC pin 16, circuit (O/LG), harness side and ground.
  • Is the voltage greater than 10 volts? 
 Yes Go to next step.
No VERIFY the smart junction box (SJB) fuse 7 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
4 CHECK THE DLC GROUND CIRCUITS
  • Key OFF.
  • Measure the resistance between the DLC pin 4, circuit (B), harness side and ground; and between the DLC pin 5, circuit (B/W), harness side and ground.
  • Are the resistances less than 5 ohms? 
 Yes REPAIR the WDS or equivalent tester. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
No REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
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