Dtc 9-1 (Iat Sensor Low Voltage) - Honda TRX500FM Service Manual

OTe 9·1 (IAT SENSOR LOW VOLTAGE)
1. tAT Sensor System Inspection
Turn the IQnilion switch ON and engine stop switch
Check the tAT sensor with the HOS pocket tes ter.
Is about 0 V indicated?
YES - GO TO STEP 2.
NO - Intermittent failure.
2. tAT Sensor Inspection
Tum the .gnilion switch OFF.
DIsconnect the tAT sensor 2P (Black) connector.
Turn the ignition switch ON and engine stop switch
W
Check the tAT sensor wIth the HOS pocket tester.
Is about 0 V indicated?
YES - GO TO STEP 4.
NO - GO TO STEP 3.
3. tAT Sensor Resistance Inspection at PCMIECM
Connector
Tum the ignition switch OFF.
Connect the tAT sensor 2P (Black) connector.
Disconneci lhe PCMlECM 33P (Gray) connector [ 1).
Measure the resistance between the wire harness
side PCMfECM 33P (Gray) connector terminals.
Connection : 82 - 826
TOOL:
Test probe 07ZAJ ·RDJA 110
Standard: 2.2 - 2.7 kO (20°C/68°F)
111
Is the res istance within 2.2 - 2.7 kD (20°Cl68°F)?
YES - Replace the PCMlECM with a known good
I
one (page
4-34).
and recheck.
L. - - - - -
NO _. Faulty IAT sensor.
4. tAT Sensor Output Line Short Circuit Inspection
Disconnect the IAT sensor 2P (Black) connector [ 1].
Check for con tinuity between the wire harness side
IAT sensor 2P (Black) connector terminal and
ground
Connection: Gray - Ground
Is there
continuity?
YES - Short circUit In the Gray wire
NO - Replace the PCMfECM with a known good
one (page 4·34). and recheck.
Gray
PGM·FI SYSTEM
826 82
I
111
Q
4·21