FI SYSTEM DIAGNOSIS 12-57
6) Connect a 12 volt battery to the service coupler using the bat-
tery lead wire. (12-19)
7) Insert the needle-point probe to the ECM coupler.
8) Measure the voltage between terminal D and ground.
FP relay input voltage: Battery voltage
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
36890-28H00: Battery lead wire (option)
Tester knob indication: Voltage ()
Is the voltage OK?
YES
• FP relay (ECM) malfunction.
• B/R or R/B wire open or shorted, or poor termi-
nal D or E connection.
• If the wire and connection are OK. intermittent
trouble or faulty ECM.
• Recheck each terminal and wire harness fro
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Open or short circuit in the B/R wire.
1
V
ECM coupler (Harness side)
1
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