4-36 FI SYSTEM DIAGNOSIS
3) Check for proper terminal connection to the ECM couplers.
4) If connections are OK, check the following points.
• Resistance
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
Tester knob indication: Resistance (
)
– Between Bl/W wire (#1) or W/R wire (#2) of IAP sensor
coupler and ECM coupler: less than 1
– Between Bl/W wire (#1) or W/R wire (#2) and ground: infinity
– Bl/W wire (#1) or W/R wire (#2) terminal and other terminal
at IAP sensor connector: infinity
• Voltage
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
– Between Bl/W wire (#1) or W/R wire (#2) and ground:
approx. 0 V (When ignition switch is ON)
Is check result OK?
3
#1 Cylinder
3
#2 Cylinder
3
3
YES
Go to Step 4.
NO
Repair or replace the Bl/W wire (#1) or W/R wire (#2).
V
3