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(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity (4) Connect the ohmmeter between terminals 87 and 30. The ohmmeter should not show continuity at (5) Connect one end of a jumper wire (16 gauge or smaller) to relay terminal 85. Connect the other end (6) Connect one end of another jumper wire (16 gauge or smaller) to the power side of the 12 volt WARNING: DO NOT ALLOW OHMMETER TO CON- TACT TERMINALS 85 OR 86 DURING THIS TEST. (7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohm- (8) Disconnect jumper wires. ity and resistance tests. If the relay passed the tests, CAMSHAFT AND CRANKSHAFT POSITION SENSOR Refer to Group 8D, Ignition for Diagnosis and Test- ing of Camshaft and Crankshaft Sensors. ENGINE COOLANT TEMPERATURE SENSOR (1) With the key off, disconnect wire harness con- nector from coolant temperature sensor (Fig. 48) or (2) Connect a high input impedance (digital) volt- ohmmeter to terminals A and B . The ohmmeter • Engine/Sensor at normal operating temperature around 200°F should read approximately 700 to • Engine/Sensor at room temperature around 70°F ohmmeter should read approximately 7,000 to 13,000 (3) Test the resistance of the wire harness between the PCM 40-way connector terminal 26 and the sen- HEATED OXYGEN SENSOR Use an ohmmeter to test the heating element of the oxygen sensors. Disconnect the electrical connec- tor from each oxygen sensor. The white wires in the IDLE AIR CONTROL (IAC) MOTOR TEST To preform a complete test of IAC motor and its circuitry, refer to DRB scan tool and the appropriate Fig. 48 Engine Coolant Temperature Sensor Location—2.7L Fig. 49 Engine Coolant Temperature Sensor Location—3.2/3.5L 300M FUEL SYSTEM 14 - 39 DIAGNOSIS AND TESTING (Continued) |