Manual Ohms Measurements

External Ohms
1. Key OFF.

2. Select EXT on PIN SELECTOR A.

3. Select the correct ground on REFERENCE PIN selector.

4. Select the OHMS RANGE switch.

5. Verify that resistance to be measured is not connected to the vehicle.

6. Connect jumper wires from the SELECTOR PIN jacks to the device to be measured.

7. Read the value of resistance.

Harness Continuity
1. Key OFF.

2. Select the signal from PIN SELECTOR A.

3. Disconnect the sensor/actuator where signal is to be checked.

4. Connect a jumper wire from the REFERENCE PIN jack (black) to the signal pin on the harness to be tested.

5. Check for continuity -- 0 ohms.

Harness Shorts
1. Key OFF.

2. Select the signal from PIN SELECTOR A.

3. Set the OHMS RANGE switch to 200K.

4. Disconnect the sensor/actuator to be tested.

5. Disconnect the Powertrain Control Module (PCM).

6. Select the various power or ground signals from the REFERENCE PIN selector for which the device is being tested. Example: VREF, SIGRTN, PWR GND.

7. Read resistance: 0 ohms or a low resistance reading indicates a short; 10K ohms or higher indicates an open.

Ohms Value (Coil Resistance)
1. Key OFF.

2. Select the signal from PIN SELECTOR A and PIN TYPE.

3. Select the correct ground from the REFERENCE PIN selector.

4. Select the OHMS RANGE switch.

5. The WIGGLE TEST light will illuminate and sound; press the WIGGLE TEST RESET button.

6. The MANUAL TEST light should be blinking; value in ohms units.

Ohms Wiggle Testing
1. Key OFF.

2. Select the signal from PIN SELECTOR A and PIN TYPE.

3. Select the correct ground from the REFERENCE PIN selector.

4. Tap the components, flex the harness and connectors.

5. The WIGGLE TEST light and beeper will activate when the change is sensed.

6. The OHMS Wiggle Test is less sensitive than the DCV Wiggle Test.

7. Criteria for using the OHMS Wiggle Test as opposed to DCV Wiggle Test:
- All sensors that do not use DCV units in the AUTO mode. Example: PIP, SPOUT, CKP.

Power/Ground Harness Continuity
1. Key OFF.

2. Select EXT on PIN SELECTOR A.

3. Select the desired power/ground signal on the REFERENCE PIN selector.

4. Disconnect the sensor/actuator where the power/ground signal is to be checked.

5. Connect a jumper wire from the SELECTOR PIN jack (red) to the ground/power signal pin on the harness to be tested.

6. Check for continuity -- 0 ohms.