The Honda ST1300 sport touring motorcycle utilizes an advanced electronic fuel injection (FI) system to optimize performance and efficiency.
This electronically controlled system also has self-diagnostic capability when a problem arises. The FI system detects issues by setting fault codes that appear on the dashboard.
Knowing how to interpret Honda ST1300 FI codes is important for troubleshooting and repairs. This allows riders to identify and address problems promptly.
FI System Overview
The Programmed Fuel Injection (PGM-FI) automatically maintains optimal air-fuel ratio for all operating conditions.
It uses multiple sensors to monitor inputs like throttle position, intake air temperature, coolant temperature, and oxygen content in the exhaust.
The ECU computer processes these signals to manage fuel delivery through throttle body injectors.
It adjusts ignition timing and fuel mapping based on sensor data.
FI Fault Codes
If the ECU detects abnormal signals from sensors or improper operation, it sets an FI indicator along with 2-digit fault codes.
These codes identify the system parameter that is out of range or operating incorrectly.
Codes below 10 indicate an issue with the ECU or its inputs.
Codes from 11–99 point to problems with specific engine sensors or circuits. Knowing the codes guides troubleshooting of FI system faults.
If there’s a code, the FI will flash your code(s). Count the flashes.
There are long blinks and short blinks.
Long = 1.3 seconds
Short = .5 seconds
If you have a long blink, then 3 short ones…..that’s 13.
A long blink = 10
A short blink = 1
9 short blinks = 9….and so on.
| No. of PGM-FI MIL Blinks | Causes | Symptoms |
|---|---|---|
| 0 (No Blinks) | Faulty bank angle sensor Faulty ECM Blown PGM-FI fuse Faulty Engine Stop relay | Engine does not start |
| 0 (Stays lit) | Short circuit in service check connector or Short circuit in service check connector wire or Faulty ECM | Engine operates normally |
| 1 | Loose contacts on the MAP sensor connector Open or short circuit in MAP sensor wire Faulty MAP sensor | Engine operates normally |
| 2 | Loose MAP sensor vacuum hoses or the sensor itself | Engine operates normally |
| 7 | ECT sensor poorly connected or open circuit | Hard start at a low temperature (90°C/194°F) |
| 8 | Faulty TP sensor or TP sensor wiring | Poor engine response when operating the throttle quickly |
| 9 | Poor IAT sensor connection or open wire | Engine operates normally |
| 11 | Faulty Vehicle speed sensor or connection or wiring | Engine operates normally |
| 12 | Loose or poor contact on No.1 Injector connector Open or faulty No.1 injector connector wire | Engine doesn’t start |
| 13 | Loose or poor contact on No.2 Injector connector Open or faulty No.2 injector connector wire | Engine doesn’t start |
| 14 | Loose or poor contact on No.3 Injector connector Open or faulty No.3 injector connector wire | Engine doesn’t start |
| 15 | Loose or poor contact on No.4 Injector connector Open or faulty No.4 injector connector wire | Engine doesn’t start |
| 18 | Cam pulse sensor connection or loose sensor | Engine doesn’t start |
| 19 | Ignition pulse sensor connection or loose sensor Faulty ignition pulse generator | Engine doesn’t start |
| 21 | Faulty No.1/3 O2 sensor | Engine operates normally |
| 22 | Faulty No.2/4 O2 sensor | Engine operates normally |
| 23 | Faulty No.1/3 O2 sensor heater | Engine operates normally |
| 24 | Faulty No.2/4 O2 sensor heater | Engine operates normally |
| 25 | Loose or poor connection on left knock sensor connector faulty left knock sensor | Engine operates normally |
| 26 | Loose or poor connection on right knock sensor connector faulty right knock sensor | Engine operates normally |
| 33 | Faulty E2-PROM in ECM | Engine operates normally Doesn’t hold self diagnosis data |
Things to know about the PGM-FI system
Codes are displayed on the dashboard when the FI indicator comes on.
Codes are 2-digit numbers that identify the faulty component or circuit.
ECU has a self-diagnostic function to detect issues.
You can troubleshoot problems quickly by knowing the codes.
Checking wiring and connectors is the first step in diagnosing faults.
Fix the underlying problem before clearing the code.
Codes can be cleared by turning the ignition switch 4 times. Riding the bike resets the ECU and turns off the FI indicator.
Reference: https://stwiki.notonthe.net/twiki/bin/view/ST13/ECMFaultCodes