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DTC 1-2-2 OUTSIDE TEMP. SENSOR CIRCUIT OPEN OR SHORTED TO POWER 1) Ensure DTCs 1-2-2, 1-2-4, 1-2-6, 2-1-1, 2-2-1, 2-3-1, 2-3- 3 or 2-3-5 are not present at the same time. If any of these codes are present at the same time, check for an open circuit in the common ground wire. If only DTC 1-2-2 is present, go to next step. 2) Turn ignition off. Install test unit and adapter between ECC control module and harness connector. Using ohmmeter, connect test leads between ground and test unit pins No. 6, 9, 10 and 56. Ohmmeter should read zero ohms in each terminal. If resistance is as specified, go to next step. If resistance is not as specified, check for open circuit. 3) Turn ignition on. Connect voltmeter between test unit pins No. 10 and 14. Check voltage to outside temperature sensor. Voltage should be about 2.6 volts at 68 F (20 C). If voltage reading is 5 volts, check for open in circuit or in outside temperature sensor. If voltage reading is 12 volts, check for open in circuit between sensor harness terminal No. 1 and ECC control module. 4) Turn ignition off. Disconnect Adapter (981 3194) from ECC control module. Disconnect outside temperature sensor connector (located on right rear of engine compartment). See Figs. 4 and 5. Install jumper wire between sensor harness terminals. Connect ohmmeter between test unit pins No. 10 and 14. If ohmmeter reads zero ohms, wire is okay. Check for faulty sensor. If ohmmeter reads infinity, sensor is okay. Check for open circuit. DTC 1-2-3 & 1-2-5 DRIVER’S OR PASSENGER’S SIDE TEMP. SENSOR CIRCUIT SHORTED TO GROUND 1) Turn ignition off. Install test unit and adapter between ECC control module and harness connector. Using ohmmeter, connect test leads between ground and test unit pins No. 6, 9, 10 and 56. Ohmmeter should read zero ohms in each terminal. If resistance is as specified, go to next step. If resistance is not as specified, check for open circuit. 2) Disconnect adapter from ECC control module. Disconnect appropriate side temperature sensor connector. See Figs. 6 and 7. Connect ohmmeter to test unit pins No. 10 and 12 to check driver’s side temperature sensor and terminals No. 10 and 13 to check passenger’s side temperature sensor. 3) If ohmmeter reads zero ohms, check for short circuit between driver’s or passenger’s side temperature sensor and ECC control module. See WIRING DIAGRAMS. 4) To check driver’s or passenger’s side temperature sensor, ensure harness connector from sensor is disconnected. Connect ohmmeter between temperature sensor terminal No. 3 (Brown wire) and terminal No. 5 (Green or Yellow wire). Resistance should be 8000-12,000 ohms. If resistance is not as specified, replace faulty temperature sensor. Fig. 6: Identifying Passenger Compartment Temperature Sensor Connector & Component Terminals Courtesy of Volvo Cars of North America. |