Steps For Replacing Icu In Honda Motorcycle

Flash pattern

Fault

Solution

One short, one long, one short, one long

Key already registered

Use a new or cancelled key

Two short, two long

Faulty receiver or wiring

Follow Troubleshooting procedure below

One short, one long, two short

Key already registered on old ICU

Use a new key

Ignition system 5*9

present, the indicator unit is faulty and must be replaced with a new one (see Chapter 9). If there is no voltage, check for continuity in the wiring, referring to the Wiring Diagrams at the end of Chapter 9. The green wire goes to earth (ground).

41 If the lights have come on, remove the left-hand side panel (see Chapter 8). Disconnect the ICU 22-pin wiring connector. Using a voltmeter, connect the positive (+ve) probe to the white/red wire terminal on the loom side of the indicator connector and the negative (-ve) probe to earth (ground). Turn the ignition ON - there should be battery voltage.

42 If there was no voltage, using a voltmeter, connect the positive (+) probe to the white/red wire terminal on the loom side of the indicator connector and the negative (-) probe to the green wire terminal on the loom side of the instrument cluster connector. Turn the ignition ON - there should be no voltage for two seconds, then there should be battery voltage. If there is no voltage after two seconds, check for continuity in the wiring, referring to the Wiring Diagrams at the end of Chapter 9. The green wire goes to earth (ground). If no voltage is present, the indicator unit is faulty and must be replaced with a new one (see Chapter 9). If there is voltage, check for continuity in the white/red wire between the indicator unit and the ICU.

43 If there is voltage in Step 41, disconnect the ICU wiring connector. Using a voltmeter, connect the positive (+) probe to the black/white wire terminal on the loom side of the ICU connector and the negative (-) probe to earth (ground). Turn the ignition ON - there should be battery voltage. If there is no voltage, check for continuity In the black/white wire, referring to the Wiring Diagrams at the end of Chapter 9. If voltage is present, check for continuity to earth (ground)

in the green wire. If the wiring is good, check the ICU connector for loose, damaged or corroded terminals. If the connector is good, then the ICU could be faulty, and should be checked by a Honda dealer.

Indicator light stays on when ignition switched ON

44 Check lhat none of the other registered keys are close to the receiver. If they are, remove them and try the ignition again.

45 Turn the ignition ON with a spare key and check the indicator light, which should come on for two seconds, then go out. If it does, the first key is faulty. If it doesn't, perform the fault diagnosis procedure described above. If a fault code is displayed, use the appropriate table to determine the fault and the solution.

46 If no fault code is displayed, or the system does not go into fault diagnosis mode, remove the seat (see Chapter 8). Disconnect the ICU 22-pin black wiring connector. Using a voltmeter, connect the positive (+) probe to the white/red wire terminal on the loom side of the indicator connector and the negative (-) probe to earth (ground). Turn the ignition ON -there should be battery voltage. If there is no voltage, check for continuity in the white/red wire between the ICU and the indicator unit.

47 If there is voltage, check for continuity in the yellow and white/yellow wires between the ICU and the ignition pulse generator, referring to the Wiring Diagrams at the end of Chapter 9. If there is no continuity, trace the fault and repair or replace the wiring as necessary. If there is continuity, the ICU could be faulty and should be taken to a Honda dealer for assessment.

Fault code indicated by flash pattern

48 If the 'two short, two long' flash pattern has been indicated during the fault diagnosis procedure, remove the fairing (see Chapter 8).

Trace the wiring from the receiver on the ignition switch and disconnect it at the connector. Using a voltmeter, connect the positive (+) probe to the yellow/red wire terminal on the loom side of the receiver connector and the negative (-) probe to earth (ground). Turn the ignition ON - there should be approximately 5 volts present. If there is no voltage, check for continuity in the yellow/red wire between the ICU and the receiver, and repair or replace the wiring if there is no continuity.

49 If there is 5 volts present, check for continuity to earth (ground) in the green/orange wire, and repair or replace the wiring if there is no continuity.

50 If the wiring is good, using a voltmeter, connect the positive (+) probe to the pink wire terminal on the loom side of the receiver connector and the negative (-) probe to earth (ground). Turn the ignition ON - there should be approximately 5 volts present. If there is, the receiver is faulty.

51 If there is no voltage, check for continuity in the orange/blue and pink wires between the ICU and the receiver, and repair or replace the wiring if there is no continuity between the connectors, or if there is continuity in either to earth (ground). If the wiring is good, the receiver is faulty.

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