Test H: C1175 and C1236

H : C1175 - Wheel Speed Sensor Circuit Left Rear Electrical Failure
C1236 - Wheel Speed Sensor Circuit Left Rear Signal Failure

H1: MECHANICAL CHECK





1. Check the sensor fitted condition (air gap).
- Is the sensor gap 0.14 to 1.67 mm?
- Is the sensor face free of foreign matter?
- Is the sensor wheel damaged?
- Is the sensor wheel free of foreign matter?
-> Yes Go to H2.
-> No Rectify the fault(s) and test the system for normal operation.

H2: CHECK SENSOR CONTINUITY

FL001:

1. Ignition switch to position 0.

2. Disconnect RLOO1 on the rear of the hub assembly.

3 With RL001 disconnected, measure the resistance between sensor pins 1 and 2.

- Is the resistance between 1040 and 1160 ohms?
-> Yes Do not reconnect. Go to H3.
-> No Renew the wheel speed sensor, and test the system for normal operation.

H3: CHECK SENSOR OUTPUT

NOTE: The observed voltage will fluctuate and be proportional to the wheel speed.

FL001:

1. With the LH rear wheel raised, spin the wheel and note the output voltage from the sensor at RLOO1/001 and RL001/002.

- Is the voltage greater than 0 volts and less than 5 volts?
-> Yes Go to H4.
-> No Renew the wheel speed sensor, and test the system for normal operation.

H4: CHECK HARNESS SIGNAL CONTINUITY

NOTE: LF037 may be released by pulling the top mounted plunger upwards, this will release and simultaneously withdraw the connector from the ABS/TCS.

LF037 And RL001:

1. Disconnect LF037 behind the headlamp assembly.

2. Measure the resistance between LF037/021 and RLOO1/OO2, LF037/022 and RLOO1/OO1.

- Is the resistance less than 0.5 ohms?
-> Yes Do not reconnect. Go to H5.
-> No Inspect harness / connectors LF037/022 and 021, LF060/002 and 003, RH001/017 and 018, BT002/012 and 013, BTO72/001 and 002, RLOO1/001 and 002 for damage/corrosion, bent/ pushed back pins. Check for continuity between all pins. Repair as necessary and test the system for normal operation.

H5: CHECK HARNESS SHORT TO GROUND

LF037:

1. Measure the insulation resistance between ground LF3AS (adjacent to the ABS pump) and LF037/022, ground LF3AS and LF037/021.

- Is the resistance greater than 10,000 ohms?
-> Yes Do not reconnect. Go to H6.
-> No Inspect harness / connectors LF037/022 and 021, LFO6O/002 and 003, RH001/017 and 018, BTOO2/012 and 013, BT072/001 and 002, RL001/001 and 002 for damage / corrosion, bent / pushed back pins. Check for resistance against ground between all connectors and ground LF3AS. Repair as necessary and test the system for normal operation.

H6: CHECK HARNESS SHORT CORE TO CORE

LF037:

1. Measure the insulation resistance between LF037/022 and LF037/021.

- Is the resistance greater than 10,000 ohms?
-> Yes Go to H7.
-> No Inspect harness / connectors LF037/022 and 021, LF060/002 and 003, RHOO1/O17 and 018, BT002/012 and 013, BT072/001 and 002, RL001/001 and 002 for damage / corrosion, bent / pushed back pins. Repair as necessary and test the system for normal operation.

H7: CHECK FOR SHORT TO B+

LF037:

1. Ignition switch to position II.

2. Measure the voltage between ground LF3AS and LF037/022, ground LF3AS and LF037/021.

- Is the voltage 0 volts?
-> Yes Go to H8.
-> No Inspect harness/connectors LF037/022 and 021, LF060/002 and 003, RH001/017 and 018, BT002/012 and 013, BT072/001 and 002, RL0O1/001 and 002 for damage / corrosion, bent / pushed back pins. Repair as necessary and test the system for normal operation.

H8: CHECK FOR SHORT TO IGNITION

LF037:

1. Ignition switch to position 0.

2. Measure the resistance between ground LF037/020 and LF037/021, ground LF037/020 and LF037/022.

- Is the resistance greater than 10,000 ohms?
-> Yes Go to H9.
-> No Inspect harness / connectors LF037 for damage / corrosion, bent / pushed back pins. Repair as necessary and test the system for normal operation.

H9: END

1. Drive the vehicle three times from 0 to 20 kph, without wheel slip and check for the presence of DTCs afterwards.

- Has the fault code cleared?
-> Yes STOP.
-> No Contact Jaguar Service.