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DTC P0512 [MZR-CD (RF Turbo)]

id0102f1016800

DTC P0512 | Engine switch circuit high input
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DETECTION CONDITION | • The PCM monitors the engine speed and the starter signal. If the engine speed is more than 700 rpm and the starter switch ON signal is input, the PCM determines that there is a malfunction in the starter switch circuit. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Engine switch malfunction • Starter relay malfunction • Connector or terminal malfunction • Short to power supply in wiring harness between starter relay terminal A and PCM terminal 39 • Short to power supply in wiring harness between engine switch terminal A and starter relay terminal E • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the WDS or equivalent to the DLC-2. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4 | INSPECT STARTER RELAY CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 10.
No | Go to the next step.
5 | DETERMINE IF MALFUNCTION IS IN ENGINE SWITCH SIDE OR STARTER RELAY SIDE • Turn the engine switch to the ON position (Engine off). • Measure the voltage between starter relay terminal E and body ground. • Is the voltage B+? | Yes | Go to Step 7.
No | Go to the next step.
6 | DETERMINE IF MALFUNCTION IS IN STARTER RELAY OR PCM SIDE • Turn the engine switch to the ON position (Engine off). • Measure the voltage between starter relay terminal A and body ground. • Is the voltage B+? | Yes | Go to Step 9.
No | Inspect the starter relay, then go to Step 10.
7 | INSPECT ENGINE SWITCH CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 10.
No | Go to the next step.
8 | INSPECT ENGINE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the engine switch to the ON position (Engine off). • Measure the voltage between engine switch terminal A and body ground. • Is the voltage B+? | Yes | Repair or replace the wiring harness for a short to power supply, then go to Step 10.
No | Inspect engine switch, then go to Step 10.
9 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to the next step.
No | Repair or replace the wiring harness for a short to power supply between starter relay terminal A and PCM terminal 39, then go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P0512 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.