Honda CBR125RW - Service manual > PGM-FI

PGM-FI SYMPTOM TROUBLESHOOTING

When the motorcycle has one of these symptoms, check the DTC or MIL blinking, refer to the DTC index and begin the appropriate troubleshooting procedure. If there are no DTC/MIL blinking stored in the ECM memory, do the diagnostic procedure for the symptom, in sequence listed below, until you find cause.

Fuel System (PGM-FI)

PGM-FI SYSTEM LOCATION

Fuel System (PGM-FI)

Fuel System (PGM-FI)

PGM-FI SYSTEM DIAGRAM

Fuel System (PGM-FI)

PGM-FI CONNECTOR LOCATIONS

NOTE 1: Remove the upper cowl.

Fuel System (PGM-FI)

NOTE 2: Remove the right middle cowl.

Fuel System (PGM-FI)

NOTE 1: Lift and support the fuel tank.

NOTE 2: Open the rubber sheet.

Fuel System (PGM-FI)

PGM-FI TROUBLESHOOTING INFORMATION

GENERAL TROUBLESHOOTING

Intermittent Failure

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the MIL does not come on, check for poor contact or loose pins at all connectors related to the circuit that of the troubleshooting. If the MIL was on, but then went out, the original problem may be intermittent.

Opens and Shorts

"Opens" and "Shorts" are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something will not work at all.

With ECMs this can something mean something work, but not the way it's supposed to.

If the MIL has come on

Refer to DTC READOUT.

If the MIL did not stay on

If the MIL did not stay on, but there is a driveability problem, do the SYMPTOM TROUBLESHOOTING.

SYSTEM DESCRIPTION

SELF-DIAGNOSIS SYSTEM

The PGM-FI system is equipped with the self-diagnostic system. When any abnormality occurs in the system, the ECM turns on the MIL and stores a DTC in its erasable memory.

FAIL-SAFE FUNCTION

The PGM-FI system is provided with a fail-safe function to secure a minimum running capability even when there is trouble in the system. When any abnormality is detected by the self-diagnosis function, running capability is maintained by pre-programmed value in the simulated program map. When any abnormality is detected in the injector, the fail-safe function stops the engine to protect it from damage.

DTC

Fuel System (PGM-FI)

MIL Blink Pattern

Fuel System (PGM-FI)

MIL Check

When the ignition switch is turned ON (and engine stop switch "": CM and U type) the MIL will stay on for a few seconds, then go off. If the MIL does not come on, troubleshoot the MIL circuit.

CURRENT DTC/FREEZE DTC

The DTC is indicated in two ways according to the failure status.

HDS POCKET TESTER INFORMATION

How to connect the HDS pocket tester

Turn the ignition switch OFF.

Remove the dummy connector from the DLC.

Connect the HDS pocket tester to the DLC.

Turn the ignition switch ON (and engine stop switch "": CM and U type) check the DTC and freeze data.

NOTE:

Freeze data indicates the engine conditions when the first malfunction was detected.

ECM reset

The HDS pocket tester can reset the ECM data including the DTC, freeze data and some learning memory.

After the ECM reset, follow the idle learn procedure from ECM initialization.

Fuel System (PGM-FI)

DTC READOUT

Start the engine and check the MIL.

If the MIL stays on or blinks, connect the HDS pocket tester to the DLC, read the DTC, freeze data and follow the troubleshooting index.

To read the DTC with the MIL blinking, refer to the following procedure.

Fuel System (PGM-FI)

Reading DTC with the MIL

Turn the ignition switch OFF.

Remove the dummy connector from the DLC.

Short the DLC terminals using a special tool.

TOOL: SCS connector 070PZ-ZY30100

Connection: Blue/white - Green

Turn the ignition switch ON (and engine stop switch "": CM and U type), read, note the MIL blinks and refer to the troubleshooting index.

Fuel System (PGM-FI)

NOTE:

If the ECM has any DTC in its memory, the MIL will start blinking.

CLEARING DTC

Connect the HDS pocket tester to the DLC.

Clear the DTC with the HDS pocket tester while the engine is stopped.

To clear the DTC without HDS pocket tester, refer to the following procedure.

How to clear the DTC with SCS connector

1. Turn the ignition switch OFF.

2. Remove the dummy connector from the DLC.

Short the DLC terminals using a special tool.

TOOL: SCS connector 070PZ-ZY30100

Connection: Blue/white - Green

3. Turn the ignition switch ON (and engine stop switch "": CM and U type).

4. Remove the special tool from the DLC.

5. The MIL will light for approximately 5 seconds. While the MIL lights, short the DLC terminals again with a special tool. The self-diagnostic memory is erased if the malfunction indicator goes off and starts blinking.

Fuel System (PGM-FI)

NOTE:

CIRCUIT INSPECTION

INSPECTION AT ECM CONNECTOR

TOOL: Test probe 07ZAJ-RDJA110

Fuel System (PGM-FI)

TEST HARNESS CONNECTION

Lift and support the fuel tank.

Open the rubber sheet.

Turn the ignition switch OFF.

Disconnect the ECM 33P connector.

Fuel System (PGM-FI)

Connect the ECM test harness between the main wire harness and ECM.

TOOL: ECM test harness 33P 070MZ-MCA0100

Fuel System (PGM-FI)

TEST HARNESS TERMINAL LAYOUT

The ECM 33P connector terminals are numbered as shown in this illustration.

The ECM test harness terminals are same layout as for the ECM 33P connector terminals as shown.

Fuel System (PGM-FI)

See also:

 Honda CBR125RW - Service manual > Fuel System (PGM-FI)

COMPONENT LOCATION SERVICE INFORMATION

 Honda CBR125RW - Service manual > DTC Index

SENSOR UNIT POWER LINE INSPECTION BEFORE DTC TROUBLESHOOTING When the DTC displays 1-1, 1-2, 8-1, 8-2, 9-1 and 9-2, check the following before DTC troubleshooting. Before starting the inspection, check for loose or poor contact on the sensor unit 5P connector and ECM 33P connector.

Owner's Manuals

Service manuals