DTC    12    Crankshaft Position Sensor Circuit Malfunction

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DESCRIPTION

The crankshaft position sensor in the engine control system contains a signal plate and a pickup coil for the TDC signal. The TDC signal plate has 1 tooth on its outer circumference. The TDC signal sensor generates 1 signal for every crankshaft revolution. The ECM detects the top dead center position based on the TDC signal.

DTC Code
DTC Detection Condition
Trouble Area
12
No TDC signal is sent to the ECM at 400 rpm or more.
  1. Open or short in crankshaft position sensor circuit
  2. Crankshaft position sensor
  3. ECM

WIRING DIAGRAM


A009BA0E03


INSPECTION PROCEDURE

1.INSPECT CRANKSHAFT POSITION SENSOR

  1. Inspect the crankshaft position sensor (See page Нажмите здесь).



NG
REPLACE CRANKSHAFT POSITION SENSOR (Нажмите здесь)
OK


2.CHECK ECM (TDC, NE SIGNAL)


    A0096MYE09

  1. While cranking or idling, check the waveforms according to the value(s) in the table below.

    OK:
    Tester Connection
    		Condition
    		Specified Condition
    C101-17 (TDC+) - C101-16 (TDC-)
    		Idling
    		Correct waveform is as shown
    C101-19 (NE+) - C101-18 (NE-)
    		Idling
    		Correct waveform is as shown

    Text in Illustration 
    *a
    		Component with harness connected
    (ECM)
    *b
    		TDC and NE Signal Waveforms



NG
Перейдите к шагу 3
OK

REPLACE ECM (Нажмите здесь)  

3.CHECK HARNESS AND CONNECTOR (ECM - CRANKSHAFT POSITION SENSOR)

  1. Disconnect the crankshaft position sensor connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C109-1 - C101-17 (TDC+)
    		Always
    		Below 1 Ω
    C109-2 - C101-16 (TDC-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C109-1 or C101-17 (TDC+) - Body ground
    		Always
    		10 kΩ or higher
    C109-2 or C101-16 (TDC-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the crankshaft position sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)