DTC P0512:00 [MZR-CD 2.2]

id0102f3155700

DTC P0512:00

Ignition switch circuit high input
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.
Monitoring conditions
―  Following conditions are met:
•  Battery voltage: 8—20 V
•  Engine speed: more than 700 rpm
Diagnostic support note
•  The MIL illuminates if the PCM detects the above malfunction condition in first drive cycle.
•  PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA (mode2) and snapshot data are available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Starter relay connector or terminal malfunction
•  Short to power supply in wiring harness between ignition switch terminal A and starter relay terminal E
•  Short to power supply in wiring harness between starter relay terminal A and PCM terminal 1CB
•  Starter relay malfunction
•  Ignition switch connector or terminal malfunction
•  Ignition switch malfunction
•  PCM connector or terminal malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE2) OR SNAPSHOT DATA HAVE BEEN RECORDED
•  Have FREEZE FRAME DATA (mode2) or snapshot data been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (mode2) and snapshot data on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
•  If 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 M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD 2.2].)
4
INSPECT STARTER RELAY CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to 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 IGNITION SWITCH SIDE OR STARTER RELAY SIDE
•  Switch the ignition to ON (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
•  Switch the ignition to ON (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.
(See RELAY INSPECTION.)
7
INSPECT IGNITION SWITCH CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to 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 IGNITION SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (Engine off).
•  Measure the voltage between ignition 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 ignition switch, then go to Step 10.
9
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to 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 1CB, then go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P0512:00 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD 2.2].)
No
DTC troubleshooting completed.