Honda SH300 2006 Manual page 495

Diagnostic code
1. Immobilizer Receiver Power Input Line Inspection
Check the power input line (Yellow/Red) at the immobilizer receiver connector (page 23-13).
Is there approx. 5 V?
YES – GO TO STEP 2.
NO – Open or short circuit in Yellow/Red wire
2. Immobilizer Receiver Ground Line Inspection
Check the ground line (Green/Black) at the immobilizer receiver connector (page 23-13).
Is there continuity?
NO – Open circuit in Green/Black wire
YES – GO TO STEP 3.
3. Immobilizer Receiver Signal Line Inspection
Check the signal lines (Pink and Orange/Blue) between the immobilizer receiver and ECM connectors
(page 23-13).
Is the diagnostic code
YES – GO TO STEP 4.
NO – • Open or short circuit in Pink wire
• Open or short circuit in Orange/Blue wire
4. Immobilizer Receiver Inspection
Replace the immobilizer receiver with a known good one and check the diagnostic code.
Is the diagnostic code
YES – Replace the ECM with a new one, and recheck
NO – Faulty original immobilizer receiver
is indicated (Code signals cannot send or receive)
?
?
IMMOBILIZER SYSTEM (HISS)
23-11