2006-2009 Suzuki LT-R450 Service Manual, Page 160Get this manual
FI SYSTEM DIAGNOSIS
Disconnect the lAP sensor couplerTurn the ignition switch ON Measure the voltage at the Red wire and groundIf OK, then measure the voltage at the Red wire and BBr wirelAP sensor input voltage: 4.55.5 (c) RedGround) (c) RedBBr)
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MUlti-circuit tester set