ENGINE IMMOBILISER SYSTEM(w/o Entry and Start System) TERMINALS OF ECU

CHECK TRANSPONDER KEY AMPLIFIER

1. Disconnect the H44 amplifier connector.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   H44-7 (AGND) - Body ground	R - Body ground	Ground	Always	Below 1 Ω

   If the result is not as specified, there may be a malfunction on the wire harness side.

3. Reconnect the H44 amplifier connector.

4. Measure the voltage according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   H44-1 (VC5) - H44-7 (AGND)	BE - R	Power supply	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	4.6 to 5.4 V
   H44-4 (CODE) - H44-7 (AGND)	GR - R	Demodulated signal of key code data	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	Pulse generation (see waveform 1)
   H44-5 (TXCT) - H44-7 (AGND)	G - R	Key code output signal	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	Pulse generation (see waveform 2)

   If the result is not as specified, the amplifier may have a malfunction.

5. 

   Inspect using an oscilloscope.

   1. Waveform 1 (Reference)

      Table 1. Measurement Condition

      Item	Content
      Tester Connection	H44-4 (CODE) - H44-7 (AGND)
      Tool Setting	5 V/DIV., 20 msec./DIV.
      Condition	Key inserted in ignition key cylinder

   2. 

      Waveform 2 (Reference)

      Table 2. Measurement Condition

      Item	Content
      Tester Connection	H44-5 (TXCT) - H44-7 (AGND)
      Tool Setting	5 V/DIV., 20 msec./DIV.
      Condition	Key inserted in ignition key cylinder

CHECK TRANSPONDER KEY ECU

1. Disconnect the H110 ECU connector.

2. Measure the resistance and voltage according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   H110-16 (GND) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
   H110-1 (+B) - H110-16 (GND)	W - BR	Battery	Always	11 to 14 V
   H110-2 (IG) - H110-16 (GND)	B - BR	Ignition switch	Ignition switch off	Below 1 V
   			Ignition switch ON	11 to 14 V
   H110-3 (KSW) - H110-16 (GND)	L - BR	Unlock warning switch	No key in ignition key cylinder	10 kΩ or higher
   			Key inserted in ignition key cylinder	Below 1 Ω

   If the result is not as specified, there may be a malfunction on the wire harness side.

3. Reconnect the H110 ECU connector.

4. Measure the resistance and voltage according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   H110-14 (VC5) - H110-16 (GND)	BE - BR	Power source	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	4.6 to 5.4 V
   H110-7 (CTY) - H110-16 (GND)	BR - BR	Front door courtesy light switch (for Driver Side)	Driver door closed	10 kΩ or higher
   			Driver door open	Below 1 Ω
   H110-4 (TXCT) - H110-16 (GND)	G - BR	Transponder key amplifier communication signal	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	Pulse generation (see waveform 1)
   H110-15 (CODE) - H110-16 (GND)	GR - BR	Transponder key amplifier communication signal	No key in ignition key cylinder	Below 1 V
   			Key inserted in ignition key cylinder	Pulse generation (see waveform 2)
   H110-13 (EFIO) - H110-16 (GND)	P - BR	ECM output signal	Ignition switch off	Below 1 V
   			Ignition switch ON	Pulse generation (see waveform 3)
   H110-12 (EFII) - H110-16 (GND)	LG - BR	ECM input signal	Always	Pulse generation (see waveform 4)
   H110-8 (IND) - H110-16 (GND)	Y - BR	Security indicator light signal	Immobiliser set	Alternating between 11 to 14 V and below 1 V
   			Immobiliser unset	Below 1 V
   H110-9 (D) - H110-16 (GND)	SB - BR	Diagnosis tester communication	Always	Pulse generation
   H110-5 (AGND) - Body ground	R - Body ground	Ground	Always	Below 1 Ω

   If the result is not as specified, the ECU may have a malfunction.

5. 

   Inspect using an oscilloscope.

   1. Waveform 1 (Reference)

      Table 3. Measurement Condition

      Item	Content
      Tester Connection	H110-4 (TXCT) - H110-16 (GND)
      Tool Setting	5 V/DIV., 20 msec./DIV.
      Condition	Key inserted in ignition key cylinder

   2. 

      Waveform 2 (Reference)

      Table 4. Measurement Condition

      Item	Content
      Tester Connection	H110-15 (CODE) - H110-16 (GND)
      Tool Setting	5 V/DIV., 20 msec./DIV.
      Condition	Key inserted in ignition key cylinder

   3. 

      Waveform 3 (Reference)

      Table 5. Measurement Condition

      Item	Content
      Tester Connection	H110-13 (EFIO) - H110-16 (GND)
      Tool Setting	10 V/DIV., 100 msec./DIV.
      Condition	Ignition switch ON

   4. 

      Waveform 4 (Reference)

      Table 6. Measurement Condition

      Item	Content
      Tester Connection	H110-12 (EFII) - H110-16 (GND)
      Tool Setting	10 V/DIV., 100 msec./DIV.
      Condition	Always