MALFUNCTION OF ACCELERATOR SENSOR 1 [LO]
(DTC CODE P2122 / DIAGNOSIS MONITOR CODE 22)

1. Set the starter key to the "LOCK" position and disconnect a connector of the accelerator sensor 1.
2. Measure resistance between the 4th and 5th terminals of the accelerator sensor 1 connector (component side).

   
   

   
   

   Standard value: 2 Ω or more

   

   If it is difficult to troubleshoot the connector itself, go to [4] Measuring resistance between terminals.

3. Measure resistance between the 2nd and 4th terminals of the accelerator sensor 1 connector (component side).

   
   

   Standard value: 2 Ω or more

    

4. Measure resistance between the 2nd and 5th terminals of the accelerator sensor 1 connector (component side).

   
   

   Standard value: 2 Ω or more

    

NO Fault in accelerator sensor 1	YES Proceed to [2] Measuring resistance between terminals

1. Measure resistance between the 2nd and 5th terminals of the accelerator sensor 1 connector (vehicle harness side).

   
   

   Standard value: 25-35 kΩ

 

NO Faulty harness or irregular contact of connector	YES Proceed to [3] Measuring voltage between terminals

1. Turn the starter key "ON" and measure voltage between the 4th and 2md terminals of the accelerator sensor 1 connector (vehicle harness side).

   

   Standard value: 4.5-5.5 V

 

NO Faulty harness or irregular contact of connector	YES Disconnection of the harness

1. Set the starter key to the "LOCK" position and connect the signal check harness.
2. Disconnect the signal check harness connectors from the ECU and measure resistance between the terminals V47 and V50.

   

   ECU terminal No.	Description of terminal
   V47	Accelerator sensor 1
   V50	+B

   Standard value: 2 Ω or more

    

3. Measure resistance between the terminals V45 or V65 and V50.

   

   ECU terminal No.	Description of terminal
   V45, V65	GND
   V50	+B

   Standard value: 2 Ω or more

    

4. Measure resistance between the terminals V45 or V65 and V47.

   

   ECU terminal No.	Description of terminal
   V45, V65	GND
   V47	Accelerator sensor 1

   Standard value: ∞ Ω

NO Faulty harness or fault in accelerator sensor 1	YES Proceed to [5] Measuring voltage between terminals

1. Connect the signal check harness connectors to the ECU.
2. Disconnect the signal check harness connectors from the vehicle harness.
3. Turn the starter key "ON" and measure voltage between the terminals V50 and V47.



 

ECU terminal No.	Description of terminal
V47	Accelerator sensor 1
V50	+ B

Standard value: 4.5-5.5 V

 

NO Fault in engine ECU and/or ECU connectors	YES Proceed to [6] Measuring resistance between terminals

1. Set the starter key to the "LOCK" position and measure resistance between the terminals V45 or V65 and V47.

   

   ECU terminal No.	Description of terminal
   V45, V65	GND
   V47	Accelerator sensor 1

   Standard value: 25-35 kΩ

 

NO Fault in engine ECU and/or ECU connectors	YES Disconnection of the harness

1. Confirm the DTC P2122 is inactive

   • Start the engine and let it idling condition.
   • Verify the DTC P2122 is inactive.

   

2. DTC Clear

   • Clear the DTC with Hino DX
   • Confirm the same DTC is not reoccurred

   

P2122 is reoccur: Return to first process Other DTC appear: Refer to concerned Trouble shooting

Complete