Meter / Gauge System Tachometer Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER ASSEMBLY

CHECK ENGINE TYPE

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Disconnect the G19 combination meter assembly connector.
   

2. Using an oscilloscope, check the signal waveform of the meter.
   

   Item	Condition
   Tester Connection	G19-7 (S) - Body ground
   Tool Setting	5 V/DIV., 10 msec./DIV.
   Condition	Engine idling

   HINT:

   As the engine speed increases, the wavelength shortens.

   OK:

   The waveform displayed is as shown in the illustration.
   

   Text in Illustration

   *a	Front view of wire harness connector (to Combination Meter Assembly)

1. Check the engine type.
   

   Result

   Result	Proceed to
   for Gasoline Engine	A
   for Diesel Engine	B

1. Disconnect the G19 combination meter assembly connector.
   

2. Disconnect the G88*1, G146*2 or G154*3 ECM connector.
   

   1. *1: for 2TR-FE
      
   2. *2: for 2TR-FBE
      
   3. *3: for 1GR-FE
      

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

   Standard Resistance:

   for 2TR-FE

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G88-1 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G88-1 (TACH) - Body ground	Always	10 kΩ or higher

   for 2TR-FBE

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G146-29 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G146-29 (TACH) - Body ground	Always	10 kΩ or higher

   for 1GR-FE

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G154-1 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G154-1 (TACH) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

HINT:

Refer to SFI system.

1. SFI system (1GR-FE): HILUX_TGN26 RM000000PD90T9X.html
   
2. SFI system (2TR-FE [w/o Secondary Air Injection System]): HILUX_TGN26 RM000000PD90TQX.html
   
3. SFI system (2TR-FE [w/ Secondary Air Injection System]): HILUX_TGN26 RM000000PD90TRX.html
   
4. SFI system (2TR-FBE): HILUX_TGN26 RM000000PD90QFX.html
   

1. Disconnect the G19 combination meter assembly connector.
   

2. Disconnect the G39*1, G149*2 or G157*3 ECM connector.
   

   1. *1: for 1KD-FTV, 2KD-FTV
      
   2. *2: for 1KD-FTV, 2KD-FTV (for DPF)
      
   3. *3: for 1KD-FTV (for i-ART)
      

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

   Standard Resistance:

   for 1KD-FTV, 2KD-FTV

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G39-4 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G39-4 (TACH) - Body ground	Always	10 kΩ or higher

   for 1KD-FTV, 2KD-FTV (for DPF)

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G149-18 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G149-18 (TACH) - Body ground	Always	10 kΩ or higher

   for 1KD-FTV (for i-ART)

   Tester Connection	Condition	Specified Condition
   G19-7 (S) - G157-18 (TACH)	Always	Below 1 Ω
   G19-7 (S) or G157-18 (TACH) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   NG	A
   OK	B

HINT:

Refer to ECD system.

1. ECD system (1KD-FTV [for DPF]): HILUX_TGN26 RM0000012WB04PX.html
   
2. ECD system (1KD-FTV [for i-ART]): HILUX_TGN26 RM0000012WB04RX.html
   
3. ECD system (1KD-FTV [w/o EGR Cooler]): HILUX_TGN26 RM0000012WB04TX.html
   
4. ECD system (1KD-FTV [w/ EGR Cooler]): HILUX_TGN26 RM0000012WB04SX.html
   
5. ECD system (2KD-FTV [for DPF]): HILUX_TGN26 RM0000012WB04QX.html
   
6. ECD system (2KD-FTV [w/o EGR Cooler]): HILUX_TGN26 RM0000012WB04VX.html
   
7. ECD system (2KD-FTV [w/ EGR Cooler]): HILUX_TGN26 RM0000012WB04UX.html