PCM Power and Ground Circuit Troubleshooting: Inspection

+B_BACKUP_FI-ECU, FI_ECU_GND Circuit Inspection

NOTE:

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

Test Procedure

Preparation
1. -
  PCM connector A (50P): disconnected
Procedure
1. -
  Perform the inspection according to the following table.


		(Disconnected)PCM connector A (50P) female terminals
	IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
+B_BACKUP_FI-ECU circuit inspection	OFF		12 V battery voltage [circuit type 1]
FI_ECU_GND open wire inspection	OFF		There is less than 1 Ohm

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


		(Disconnected) PGM-FI main relay 1 socket (4P) female 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 1	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- Open Wire Inspection

NOTE:

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

Test Procedure

Preparation
1. -
  PGM-FI main relay 1: disconnected
2. -
  PCM connector A (50P): disconnected
Procedure
1. -
  Perform the inspection according to the following table.


		(Disconnected) PGM-FI main relay 1 socket (4P) female terminals	(Disconnected) PCM connector A (50P) 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

Results

If abnormal, there is a problem in the circuit.

IG1(MONI), GND2, PG, PG(COIL) Circuit Inspection

NOTE:

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

Test Procedure

Preparation
1. -
  PCM connector E (80P): disconnected
Procedure
1. -
  Perform the inspection according to the following table.


		(Disconnected) PCM connector E (80P) female terminals
	IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
IG1(MONI) circuit inspection	ON		12 V battery voltage [circuit type 1]
GND2 open wire inspection	OFF		There is less than 1 Ohm
PG open wire inspection	OFF		There is less than 1 Ohm
PG(COIL) open wire inspection	OFF		There is less than 1 Ohm

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.

IG1_FUEL_PUMP, FUEL_PUMP_RLY_OUT Circuit Inspection

Test Procedure

Preparation
1. -
  PGM-FI main relay 2: disconnected
2. -
  Fuel tank unit connector (4P): disconnected
Procedure
1. -
  Perform the inspection according to the following table.


			(Disconnected) PGM-FI main relay 2 socket (4P) female terminals	(Disconnected) Fuel tank unit connector (4P) female terminals

	IG Mode	Courtesy of HONDA, U.S.A., INC.	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
IG1_FUEL_PUMP circuit inspection	ON			12 V battery voltage [circuit type 1]
FUEL_PUMP_RLY_OUT 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.
FUEL_PUMP_RLY_OUT shorted to ground inspection	OFF			There is more than 1 MOhm

Results

If it is 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 Shorted Wire Inspection

NOTE:

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

Test Procedure

Preparation
1. -
  PGM-FI main relay 1: disconnected
2. -
  PGM-FI main relay 2: disconnected
3. -
  Each injector connector (2P): disconnected
4. -
  PCM connector A (50P): disconnected
Procedure
1. -
  Perform the inspection according to the following table.
  
  Refer to the Open/Shorted Wire Inspection Description for the method to inspect the shorted circuit below, then start to inspect according to circumstances.

		(Disconnected) PGM-FI main relay 1 socket (4P) female terminals
	IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
FI_MAIN_RLY_OUT shorted to ground inspection	OFF		There is more than 1 MOhm

Results

If abnormal, there is a problem in the circuit.

Components Connected to FI_MAIN_RLY_OUT Circuit Inspection

NOTE:

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

Preconditions

NOTE:

This procedure can be done before any other inspections are completed because this test procedure includes all of the following inspection items. However, if this test fails, it will be necessary to continue with each inspection item individually to determine which item failed.

External circuit is normal

Test Procedure

Preparation
1. -
  PGM-FI main relay 1: disconnected
2. -
  PGM-FI main relay 2: disconnected
3. -
  Each injector connector (2P): disconnected
4. -
  PCM connector A (50P): disconnected

Procedure
Perform the inspection according to the following table and while reconnecting these parts or connectors, one at a time:
1. -
  PGM-FI main relay 2
2. -
  Each injector connector (2P)
3. -
  PCM connector A (50P)


		(Disconnected) PGM-FI main relay 1 socket (4P) female terminals
	IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
Unit internal circuit inspection	OFF		Not shorted

Results

If it is abnormal, there is a problem with the component that caused the short to return when it was reconnected.

Fuel Pump Inspection

Preconditions

NOTE:

External circuit is normal

Test Procedure

Preparation
1. -
  PGM-FI main relay 2: disconnected

Procedure
1. -
  Perform the inspection according to the following table.


			(Disconnected) PGM-FI main relay 2 socket (4P) female terminals

	IG Mode	Courtesy of HONDA, U.S.A., INC.	Normal Conditions
Unit internal circuit inspection	OFF		Not shorted

Results

If it is normal, there is a problem with the fuel pump.

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.