airline tech
Well-Known Member
- Joined
- Aug 24, 2022
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- 20
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- 1,683
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- Location
- Midwest - KS
- Vehicle(s)
- 2022 Ranger Lariat-Super Crew, Cactus Gray
- Occupation
- Aircraft Tech
This still baffles me how they can determine a rear differential can cause steering gear issues.
I think this was a mis-diagnose. IDK about the metal shavings, but if so, it is unrelated.
I think the engine noise and the steering issue are related.
The EPAS is resorting to manual mode or reduced steering mode.
Manual Mode - Zero Steering assist (Heavy steering effort)
Reduced Steering Mode = Heavier than normal feel
So, either a bad PSCM (part of the EPAS) aka rack or communication to it over the HS-CAN network
network, the network modules include ABS-BCM -SCCM-RCM-IPMA-PCM - IPC -TCCM and PAM
The EPAS itself has Torque and Angle sensors within the unit.
And note the TCCM, Transfer Case Cont. Module is input for drive mode (2WD / 4WD)
So, as you can see there are quite a few modules that tie into the EPAS, a pinpoint code will narrow it down.
But for me and my office chair view of this = they did not address the initial complaint, as from a service manual troubleshoot without a code, I do not see any direction to check the rear differential.
Ref: The brakes still feel mushy, you stated they adjusted them - I am assuming they adjusted the brake pedal travel, now I know for a fact that the fix for this is a full system bleed- starting with the ABS module then followed by each caliper, you WILL get air out of the system at the R/Rear Caliper.
This issue alone may be the cause of the steering issues, ABS system has air in it and is tripping an ABS code, which in turn is a Dominio effect on the EPAS, it is picking up a code from the ABS module and tripping the EPAS into failure mode.
Did the dealer give you the printout with the codes they originally found that led them to the rear differential inspection?
I think this was a mis-diagnose. IDK about the metal shavings, but if so, it is unrelated.
I think the engine noise and the steering issue are related.
The EPAS is resorting to manual mode or reduced steering mode.
Manual Mode - Zero Steering assist (Heavy steering effort)
Reduced Steering Mode = Heavier than normal feel
So, either a bad PSCM (part of the EPAS) aka rack or communication to it over the HS-CAN network
network, the network modules include ABS-BCM -SCCM-RCM-IPMA-PCM - IPC -TCCM and PAM
The EPAS itself has Torque and Angle sensors within the unit.
And note the TCCM, Transfer Case Cont. Module is input for drive mode (2WD / 4WD)
So, as you can see there are quite a few modules that tie into the EPAS, a pinpoint code will narrow it down.
But for me and my office chair view of this = they did not address the initial complaint, as from a service manual troubleshoot without a code, I do not see any direction to check the rear differential.
Ref: The brakes still feel mushy, you stated they adjusted them - I am assuming they adjusted the brake pedal travel, now I know for a fact that the fix for this is a full system bleed- starting with the ABS module then followed by each caliper, you WILL get air out of the system at the R/Rear Caliper.
This issue alone may be the cause of the steering issues, ABS system has air in it and is tripping an ABS code, which in turn is a Dominio effect on the EPAS, it is picking up a code from the ABS module and tripping the EPAS into failure mode.
Did the dealer give you the printout with the codes they originally found that led them to the rear differential inspection?
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