Hi,
starting this a a new topic to avoid conflating previous issues that are unrelated.
Above a (slow) certain speed, the ABS warning light comes on (and another red one bottom left of instrument cluster) and the speedo drops to zero/bounces around. The speedo doesn't stay on zero and sometimes reads something useful and the lights are sometimes on or off even above that certain speed. This always happens when travelling above that speed (probably around 10 to 15 mph). So it ISN'T intermittent in so far as the problem is always there but the lights/speedo working properly IS intermittent when travelling above the certain speed.
I measured the items below and what I see from that is that all wheel sensors are behaving the same AND the ABS unit is always fed with power. From this, I think I can rule out reluctor rings and ABS sensors themselves. I think what I need to understand is how the sensors are linked together and power/ground is fed to them. If they are only connected to the ABS unit then maybe it has a problem, otherwise some wiring fault somewhere in that circuit.
Does anyone have any insight on how they are hooked together. I haven't been able to find a wiring diagram I understand for this. The earths have been cleaned up and secured on the inner wing and under the driver seat. The fuses have been changed.
Possibly related are connection errors between modules and relay errors as below which I am also getting.
===PCM DTC P062B:16-14===
Code: P062B - Internal Control Module Fuel Injector Control Performance
Additional Fault Symptom:
- Circuit Voltage Below Threshold
Status:
- DTC Maturing - Intermittent at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Powertrain Control Module
Diagnostic Trouble Code details
Clear fault codes
Drive the vehicle on the road.
Rerun the diagnostic.
Only replace the module if the fault still exists.
Freeze Frame #1:
-EVENT_TIME: 123298 s - Event time
-TOTAL_DISTANCE: 258639 km - Total Distance
===END PCM DTC P062B:16-14===
===PCM DTC P068A:00-28===
Code: P068A - ECM/PCM Power Relay De-Energized - Too Early
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Powertrain Control Module
Diagnostic Trouble Code details
This DTC may be caused by :
An intermittent fault.
Damaged or faulty relay
Damaged or contaminated connector
Check the wiring and the appropriate fuse.
There could be a intermittent wiring fault. Check the wiring harness.
Freeze Frame #1:
-EVENT_TIME: 123309 s - Event time
-TOTAL_DISTANCE: 258643 km - Total Distance
===END PCM DTC P068A:00-28===
===PCM DTC U0121:00-28===
Code: U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A'
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Powertrain Control Module
Freeze Frame #1:
-EVENT_TIME: 123590 s - Event time
-TOTAL_DISTANCE: 258645 km - Total Distance
-MODULE_VOLTAGE: 14.5 V - Control Module Voltage
===END PCM DTC U0121:00-28===
===ABS DTC None===
Successful DTC reading, no error codes found
Module: Antilock braking system
===END ABS DTC None===
===BCMii DTC B10A2:35-08===
Code: B10A2 - Crash Input
Additional Fault Symptom:
- Signal High Time Greater Than Maximum
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC B10A2:35-08===
===BCMii DTC B10A2:38-08===
Code: B10A2 - Crash Input
Additional Fault Symptom:
- Signal Frequency Incorrect
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC B10A2:38-08===
===BCMii DTC U0151:00-08===
Code: U0151 - Lost Communication With Restraints Control Module
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC U0151:00-08===
===BCMii DTC U0121:00-08===
Code: U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A'
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC U0121:00-08===
===BCMii DTC U0100:00-08===
Code: U0100 - Lost Communication With ECM/PCM A
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC U0100:00-08===
===BCMii DTC B10D7:87-08===
Code: B10D7 - PATS Key
Additional Fault Symptom:
- Missing Message
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC B10D7:87-08===
===BCMii DTC B10D7:94-08===
Code: B10D7 - PATS Key
Additional Fault Symptom:
- Unexpected Operation
Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
Module: Body Control Module
===END BCMii DTC B10D7:94-08===
===RCM DTC None===
Successful DTC reading, no error codes found
Module: Restraint Control Module
===END RCM DTC None===
===IPC DTC None===
Successful DTC reading, no error codes found
Module: Instrument Panel Control Module
===END IPC DTC None===