Heating Element Test - Actron CP9087 Service Manual

• Do this test if sensor has a heating element (3 or 4 wire connector).
• If sensor has 1 or 2 wire connector, do not do this test. Go directly to On-Car
Test (page 2-22).
Warning: Observe all safety precautions (see page ii) if testing sensor on vehicle.
1) Verify ignition key is OFF.
2) Check Tester battery
3) Disconnect wiring harness from sensor - Inspect for damage.
4) Connect test leads.
5) Verify test clips make good contact and do not touch each
HIGH
LOW
POWER OFF
RANGE
6) Set RANGE switch to HIGH.
VOLTS
OHMS
7) Set FUNCTION switch to OHMS.
FREQUENCY
FUNCTION
8) Observe TEST light for test results.
TEST
9) Heating Element test is complete.

Heating Element Test

Refer to page 1-4. Set RANGE switch to POWER OFF when done.
Some vehicles use a metal snap ring to secure wiring harness to
sensor. Remove this snap ring before disconnecting wiring
harness.
• YELLOW to either sensor HEATER pin.
• BLACK to remaining sensor HEATER pin.
other.
Make sure unused clips are not touching anything.
• Good Heater: TEST light OFF (low resistance).
• Bad Heater: TEST light ON in any position (resistance too
high, or open circuit).
• Set RANGE switch to POWER OFF and remove all test leads.
• Go to On-Car Test.
OXYGEN
2-21