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8-66
Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
Speed Sensor Repair Tests
1.
Take all measurements at ECU harness connector pins
in order to check wire harness and sensor. Probe the
connector carefully so that the terminals are not
damaged.
2.
Wheel speed sensor measurements should read:
3.
Clear DTC after issue is corrected. The sensor DTC will
remain until the power is cycled to the ABS ECU and
vehicle is driven above 15 MPH or DTC was cleared
using either the diagnostic blink code switch or
diagnostic tool.
ECU Wire Harness Connector: Speed Sensor Pins
2nd Blink
Code
Diagnostic Trouble Code
Description
Repair Information
1
Excessive Air Gap
Adjust sensor to contact exciter ring. Rotate wheel and verify a minimum
of 0.25 VAC sensor output at ~0.5 RPS. Verify condition of sensor head.
Verify mounting of exciter ring and condition of teeth. Verify proper
bearing end play. Verify condition and retention of clamping sleeve. Verify
sensor lead routing and clamping.
2
Output Low at Drive-off
Adjust sensor to contact exciter ring. Rotate wheel and verify a minimum
of 0.25 VAC sensor output at ~0.5 RPS. Verify condition of sensor head.
Verify mounting of exciter ring and condition of teeth. Verify proper
bearing end play. Verify condition and retention of clamping sleeve. Verify
sensor lead routing and clamping.
3
Open or Shorted
Verify 1500-2500 ohms across sensor leads. Verify no continuity between
sensor leads and ground or voltage. Verify no continuity between sensor
leads and other sensors. Check for corroded/damaged wiring or
connectors between the ECU and the wheel speed sensor.
4
Loss of Sensor Signal
Adjust sensor to contact exciter ring. Rotate wheel and verify a minimum
of 0.25 VAC sensor output at ~0.5 RPS. Verify condition of sensor head.
Verify mounting of exciter ring and condition of teeth. Verify proper
bearing end play. Verify condition and retention of clamping sleeve. Verify
sensor lead routing and clamping. Check for corroded/damaged wiring or
connectors between the ECU and the wheel speed sensor.
5
Wheel End
Verify mounting of exciter ring and condition of teeth. Verify proper
bearing end play. Verify condition and retention of clamping sleeve. Verify
sensor lead routing and clamping. Check mechanical function of brake.
Check for kinked or restricted air lines.
6
Erratic Sensor Signal
Adjust sensor to contact exciter ring. Rotate wheel and verify a minimum
of 0.25 VAC sensor output at ~0.5 RPS. Verify condition of sensor head.
Verify mounting of exciter ring and condition of teeth. Verify proper
bearing end play. Verify condition and retention of clamping sleeve. Verify
sensor lead routing and clamping. Check for corroded/damaged wiring or
connectors between the ECU and the wheel speed sensor.
7
Tire Size Calibration
Verify correct tire size as desired. Verify proper tire inflation. Verify correct
number of exciter ring teeth.
8
Configuration Error
ECU is configured for four sensors, but has detected the presence of
additional sensors. Verify sensor wiring and ECU configuration.
Location
Measurement
Sensor
1500 - 2500 Ohms
Sensor to
voltage or
ground
Open Circuit (no continuity)
Sensor output
voltage
0.25 of VAC sensor output at ~ 0.5 revs/
sec.
FIGURE 8-68
Fo
r
Reference
Only