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EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB) ECH
Sensor Removal Inspection
NOTE: Apply anti-seize compound only to threads. Anti-seize compound will aff ect sensor performance if it gets
into lower shield of sensor.
1. If sensor has heavy deposits on lower shield, engine, oil, or fuel may be source.
2. If heavy carbon deposits are observed, incorrect engine fuel control may be occurring.
3. With sensor at room temperature measure heater circuit resistance, Heater + (Pin A) and Heater - (Pin B).
Style 1 (Smaller Sensor) resistance should be 16.5-19.5 Ω.
Style 2 (Larger Sensor) resistance should be 8.1-11.1 Ω.
4. If a damaged sensor is found, identify root cause, which may be elsewhere in application. Refer to
Troubleshooting-Oxygen (O2) Sensor table.
5. A special "dry to touch" anti-seize compound is applied to all new oxygen sensors at factory. If recommended
mounting thread sizes are used, this material provides excellent anti-seize capabilities and no additional anti-seize
is needed. If sensor is removed from engine and reinstalled, anti-seize compound should be reapplied. Use an
oxygen sensor safe type anti-seize compound. It should be applied according to directions on label. Torque
sensor to appropriate torque.
Style 1 (Smaller Sensor) 18 N·m (159 in. lb.).
Style 2 (Larger Sensor) 50.1 N·m (37 ft. lb.).
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