Test 01 - Harness/Wheel Sensor

TEST SEQUENCE
1. Connections needed:
- T-plug (4a) with adapter (A) at ABS wire harness (1)
- Connecting lead from adapter (A) to cigarette lighter, red telltale lamp comes "On".
2. Switch position at adapter (A) on '3' model and test step 01 (left).





Nominal Values

3. Compare the displayed actual values obtained from the test equipment with the nominal values provided above. (if 999 k Ohms flashes, this indicates > 999 k Ohms). If nominal values are not obtained, proceed with the troubleshooting procedures below as needed.

NOTE: If "WRONG CONNECTION" appears, pull off plug on pickup and repeat test.

TROUBLESHOOTING

NOTE: Turn "Off" ignition for single tests, control unit not connected.

Speed Sensor (DF)
Front Left
1. Check front left plug connection (visual inspection).
2. Disconnect front left plug, DF reading must then be > 999 k-ohms; DF reading lower: defect in wire harness.
3. Check flow in wires 4 and 22: bridge front left plug on wire harness side, DF reading should then be < 1 ohm; DF reading higher: defect in wire harness.
4. Measure resistance at plug on speed sensor side. Specification not reached: replace front left speed sensor.

Front Right
1. 1. and 2. as above, however front right plug connection.
3. Check flow in wires 11 and 21: bridge front right plug on wire harness side, DF reading should then be < 1 ohm; DF reading higher: defect in wire harness.
4. Measure resistance at plug on speed sensor side. Specification not reached: replace front right speed sensor.

Rear Left
1. 1. and 2. as above, however rear left plug connection.
3. Check flow in wires 8 and 9: bridge rear left plug on wire harness side, DF reading should then be < 1 ohm; DF reading higher: defect in wire harness.
4. Measure resistance at plug on speed sensor side. Specification not reached: replace rear left speed sensor.

Rear Right
1. 1. and 2. as above, however right rear plug connection.
3. Check flow in wires 24 and 26: bridge rear right plug on wire harness side, DF reading should then be < 1 ohm; DF reading higher: defect in wire harness.
4. Measure resistance at plug on speed sensor side. Specification not reached: replace rear right speed sensor.

Speed Sensor Resistance To Ground Or B+
1. Visual inspection for line and wire damage (connection to vehicle ground insulation resistance).
2. Disconnect speed sensor plugs in order for reading > 999 k-ohms: replace pertinent speed sensor
3. Reading remains < 999 k-ohms: defect in wire harness.

Also refer to test step O3 when testing speed sensors!

Safety Lamp
Reading > 80 ohms: ABS indicator lamp defective or poor contact. Check or replace lamp. Check connections on lamp and term. 15. Reading < 10 ohms: check wires 1 and 29 for ground out.

Repeat test with connected diagnosis plug for "wrong connection" display (better ground connection with tester).