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Question

My mechanic was trying to diagnose a suspension issue with my 2000 Land Rover DiscoveryII. The diagnostic came back with a code of "p1590" his limited info on what that code means doesn't make sense. The problem is that the rear air ride suspension is intermittently inoperable. The traction control light and the incline lights are on. What does he need to do to fix it?

Submitted: 16 days and 11 hours ago.
Category: Car
Value: $13
Status: CLOSED
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Optional Information

Year: 2000
Make: LandRover
Model: DiscoveryII
Engine: 4.0l v-8

Accepted Answer

Here is the procedures you can give to your mechanic.

DTC P1590
Rough road signal implausible Drive cycle A:Signal implausible.

Possible causes by suggested order of priority:

  • Connectors C504, ECM C637 (B).
  • Open circuit - C637/34 (RG) to C504/4 (RG).
  • ABS fault.

Connectors C504, ECM C637 (B).
CONNECTOR

  • Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

Open Circuit - C637/34 (RG) to C504/4 (RG).
OPEN_CIRCUIT

  • Check resistance > 1M Ohm

ABS Fault.
CHECK THE FOLLOWING:

  • Carry out diagnostic checks on the ABS system. POSSIBLE FAULTS
  • Faulty ABS ECU or wiring.

Picture
Expert: Jim
Pos. Feedback: 100.0 %
Accepts: 
Answered: 11/5/2009

ASE Certified Technician

California smog licensed, ASE ceritied in L1, A6, A8 for over 30 years professionally

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