ON BOARD DIAGNOSTIC SYSTEM — Troubleshooting Code No. 09 (Engine Coolant Temperature Sensor)
F2-81flowchartCODE No. 09 (ENGINE COOLANT TEMPERATURE SENSOR)
1
STEP 1: Does engine coolant temperature sensor circuit have a poor connection?
Yes
Repair or replace connector
No
2
STEP 2: Does wire harness between engine coolant temperature sensor and ECM have continuity? (See continuity table)
No
Repair or replace
Yes
3
STEP 3: Is resistance of engine coolant temperature sensor OK? (See resistance table)
No
Replace engine coolant temperature sensor
Yes
4
STEP 4: Is same code No. present following "After-repair procedure"? (Refer to page F2-94)
No
Engine coolant temperature sensor and circuit OK
Yes
5
STEP 5: Are ECM terminal 2E and 3D voltages OK? (Refer to page F2-141)
No
Check for a short circuit in wiring from engine coolant temperature sensor to ECM
Yes
6
Replace ECM (Refer to page F2-140)
STEP 2 — Engine coolant temperature sensor to ECM continuity
A
ECM2E
B
ECM3D
STEP 3 — Engine coolant temperature sensor resistance
20°C (68°F)
Resistance (kohm)2.2-2.7
80°C (176°F)
Resistance (kohm)0.29-0.35
Circuit Diagram
Engine Coolant Temperature Sensor Circuit
ECM:2EEngine Coolant Temperature Sensor:A??
ECM:3DEngine Coolant Temperature Sensor:B??