LT-R450/ZK9 (’09-MODEL) 15
7) Remove the front fender. (LT-R450K8 7-6)
8) Disconnect the ECM coupler.
9) Check the continuity between Red wire A and terminal C.
10)Also, check the continuity between G/B wire B and terminal
6.
IAPS lead wire continuity: Continuity ()
09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
Tester knob indication: Continuity test ()
Is the continuity OK?
11)After repairing the trouble, clear the DTC using SDS tool.
(LT-R450K8 4-25)
Step 2
1) Connect the IAP sensor coupler and ECM coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Start the engine at idle speed and measure the IAP sensor
output voltage at the wire side coupler (between G/B and B/
Br wires).
IAP sensor output voltage: Approx. 2.1 V at idle speed
(+ G/B – - B/Br)
09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
Tester knob indication: Voltage ()
Is the voltage OK?
4) After repairing the trouble, clear the DTC using SDS tool.
(LT-R450K8 4-25)
When using the multi-circuit tester, do not strongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
YES Go to Step 1 (Page 12) and go to Step 2.
NO
Red wire or G/B wire open, or G/B wire shorted to
ground
YES Go to Step 3.
NO
• Open or short circuit in the G/B wire
• If wire is OK, replace the IAP sensor with a new
one.
1
ECM coupler (Harness side)
2
V
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