Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
Verify Related Repair Information Availability - Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
Inspect KS Connector For Poor Connection - Turn ignition off. Disconnect KS connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to step 9.
Inspect KS Circuit For Short To Ground - Turn ignition off. Check for continuity between following circuits. See Fig 1:
- KS harness connector terminal "A" (Green wire) and body ground
- KS harness connector terminal "B" (Red wire) and body ground
If no continuity is present, go to next step. If continuity is present, repair short circuit to ground in suspected wire or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step 9.

Fig 1: Identifying KS Circuits & Harness Connector Terminals
Courtesy of MAZDA MOTORS CORP.
Inspect KS Circuit For Short To Each Other - Turn ignition off. Disconnect KS harness connector. Check for continuity between KS harness connector terminal "A" (Green wire) and terminal "B" (Red wire). If no continuity is present, go to next step. If continuity is present, repair short between circuits between KS harness connector and PCM 104-pin harness connector terminals or replace wire harness. After repair, go to step 9.
Inspect Knock Sensor - Perform KS inspection. Refer to KNOCK SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If KS is okay, go to next step. If KS is faulty, replace KS. Refer to KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, go to step 9.
Inspect PCM Connector Terminal For Poor Connection - Turn ignition off. Disconnect PCM 104-pin harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to next step.
Inspect KS Circuit For Open Circuit - Turn ignition off. Check continuity between following circuits:
- KS harness connector terminal "A" and PCM 104-pin harness connector terminal No. 4 (Green wire)
- KS harness connector terminal "B" and PCM 104-pin harness connector terminal No. 31 (Red wire)
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspected wire or replace wire harness. After repair, go to next step.
Verify Trouble Shooting Of DTC P0325 Is Completed - Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Turn ignition on, engine off. If same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
Verify After Repair Procedure - Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.