PCM Power and Ground Circuit Troubleshooting (3.0L Engine): Inspection

+B_VBS/VBU, IG1_VBSOL2 Circuit Inspection 

NOTICE: 

Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait more than 1 minute.

Test Procedure 

• Preparation
• • PCM connector B (72P): disconnected
• Procedure
• • Perform the inspection according to the following table.

			(Disconnected)PCM connector B (72P) - Refer to: PCM Connector for Inputs and Outputs(3.0L Engine)  or PCM Connector for Inputs and Outputs(2.0L Engine) female terminals
		IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
	+B_VBS/VBU circuit inspection	OFF		12 V battery voltage [circuit type 1]
	IG1_VBSOL2 circuit inspection	ON		12 V battery voltage[circuit type 1]

Results 

• If abnormal, there is a problem in the circuit.

  If the power supply inspection of the above table showed abnormally, do the additional Power Supply Inspection , to locate the failure.

+B_IGP Circuit Inspection 

Test Procedure 

• Preparation
• • PGM-FI main relay 1: disconnected
• Procedure
• • Perform the inspection according to the following table.

			(Disconnected)PGM-FI main relay 1 4P socketfemale terminals
		IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
	+B_IGP circuit inspection 1	OFF		12 V battery voltage [circuit type 1]
	+B_IGP circuit inspection 2	OFF		12 V battery voltage[circuit type 1]

Results 

• If abnormal, there is a problem in the circuit.

  If the power supply inspection of the above table showed abnormally, do the additional Power Supply Inspection , to locate the failure.

FI_MAIN_RLY_OUT, FI_MAIN_RLY_CL- Circuit Inspection 

NOTICE: 

Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait more than 1 minute.

Test Procedure 

• Preparation
• • PGM-FI main relay 1: disconnected
  • PCM connector B (72P): disconnected
• Procedure
• • Perform the inspection according to the following table.

			(Disconnected)PGM-FI main relay 1 4P socketfemale terminals	(Disconnected) PCM connector B (72P) - Refer to: PCM Connector for Inputs and Outputs(3.0L Engine)  or PCM Connector for Inputs and Outputs(2.0L Engine) female terminals
		IG Mode	Courtesy of HONDA, U.S.A., INC.	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
	FI_MAIN_RLY_OUT open wire inspection	OFF			There is less than 1 Ohm
	FI_MAIN_RLY_CL- open wire inspection	OFF			There is less than 1 Ohm
	Refer to the Open/Shorted Wire Inspection Description for the method to inspect the shorted circuit below, then start to inspect according to circumstances.
	FI_MAIN_RLY_OUT shorted to ground inspection	OFF			Not shorted

Results 

• If abnormal, there is a problem in the circuit.

GND1, GND2, GND3 Circuit Inspection 

NOTICE: 

Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait more than 1 minute.

Test Procedure 

• Preparation
• • PCM connector B (72P): disconnected
• Procedure
• • Perform the inspection according to the following table.

			(Disconnected) PCM connector B (72P) - Refer to: PCM Connector for Inputs and Outputs(3.0L Engine)  or PCM Connector for Inputs and Outputs(2.0L Engine) female terminals
		IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
	GND1 open wire inspection	OFF		There is less than 1 Ohm
	GND2 open wire inspection	OFF		There is less than 1 Ohm
	GND3 open wire inspection	OFF		There is less than 1 Ohm

Results 

• If abnormal, there is a problem in the circuit.

PCM Inspection 

Test Procedure 

• If the other inspection item(s) indicated a normal condition, then it is determined that the remaining PCM is the cause.

Results 

• There is a problem with the PCM.