Troubleshooting - Honda Motor BF40D Manual Del Usuario

5. TROUBLESHOOTING

The ECM (Engine Control Module) has a self-diagnosis
function that memorizes the failure code and turns the
MIL (Malfunction Indicator Lamp) ON when it detects an
abnormality with the input/output system.
If the MIL does not come ON but an engine failure
(abnormality other than monitoring ECM) occurred,
troubleshoot according to the troubleshooting procedure
of each system (P. 5-73 and 76).
• HOW TO CARRY OUT TROUBLESHOOTING
When the MIL comes ON or blinks or any abnormality
occurred during running, identify the problem detected
by the ECM according to the following procedure, and
troubleshoot accordingly.
Use a known-good battery to troubleshoot.
Read the circuit tester's operation instructions carefully,
and observe the instructions during inspection.
To troubleshoot, connect the tester probe to a
commercially available digital circuit tester. Note that the
tester probe must fit the connector terminal of the digital
circuit tester so as not to apply excessive force to the
connector terminal.
Switch the tester lead polarities to check the circuit
including the diode (see below). The circuit is normal if
there is continuity in both directions or in neither
direction, the circuit is faulty.
• Indicator light
• Main relay
• Regulator/rectifier
• Power tilt relay (Power trim/tilt type only)
Clean the ECM connectors and the neighboring area
before disconnecting the connectors.
A loosely connected or corroded connector can cause
programmed-fuel injection system malfunction.
5-11
Inspection on the main wire harness side ECM must be
made using the special tool.
TOOL:
Tester probe (male)
TESTER PROBE (MALE)
07ZAJ-RDJA110
1) Turn the combination switch ON and check that the
MIL comes ON.
2) When the MIL is ON or blinking, check the DTC
(Diagnostic Trouble Code) using the HDS (Dr. H or
pocket tester) (P. 5-12).
Or, use the SCS short connector and troubleshoot the
problem indicated by the number of blinks of the MIL
(P. 5-43).
3) Perform troubleshooting
"Troubleshooting Guide by DTC" (P. 5-13) or
"Troubleshooting Guide by No. of Blinks" (P. 5-45).
Check each connector and wire harness for secure
connection and damage before troubleshooting.
Repair the connector and wire harness if necessary.
4) After troubleshooting, perform repairs as needed and
perform the "FINAL
TROUBLESHOOTING)" (P. 5-12 or 44).
406
07ZAJ-RDJA110
MIL
by referring to the
PROCEDURE (AFTER