EAS Control Unit Diagnostic Paths (60/01/04/NAS)

Publication date: 2004-10-28
Reference number: 60/01/04/NAS

EAS CONTROL UNIT DIAGNOSTIC PATHS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 60/01/04/NAS, Date of Issue: 28 October, 2004

LAND ROVER:	New Range Rover (LM)
ISSUE:	1

AFFECTED VEHICLE RANGE

New Range Rover (LM): All

SITUATION

AIR SUSPENSION PROBLEM INVESTIGATION

Troubleshooting Range Rover (LM) Electronic Air Suspension Electronic Control Units requires both care and following set procedures to avoid unnecessary ECU replacement. The ECU stores fault codes for some, but not all, air suspension system component failures. In some circumstances, changing the ECU will re-activate the system but not solve the route cause of the failure.

RESOLUTION

VERIFY ROOT CAUSE OF EAS PROBLEM

The flow diagrams in this bulletin define the only three reasons for changing the Air Suspension ECU.

The diagrams provide guidance on the diagnosis of the system that may lead to ECU replacement.

Other problems that appear to be ECU-related, are most likely caused by one of these general areas:

Other component failures
Wiring harness failures
Air harness failures

Whenever height sensor problems are resolved a re-calibration should occur to re-establish the vehicle trim heights.

PARTS INFORMATION

RQT000011: Air Suspension ECU (Up to 4A155135)

RQT000013: Air Suspension ECU (from 4A155136 (may be used to replace RQT000011))

DDW WARRANTY CLAIMS

DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.

DDW WARRANTY CLAIM

Description	SRO	Time (Hours)	Condition Code	Causal Part
Air suspension diagnosis	60.90.02	0.70	42	RQT000010

Normal warranty policy and procedures apply.

Material allowance is included in labor operation.

REPAIR PROCEDURE

INVESTIGATE ROOT CAUSE OF EAS PROBLEM

Connect T4 to the vehicle using Range Rover 14 or later and determine the stored fault codes.
If Fault Code 53 is stored, replace the EAS ECU.

Fig 1: Fault Code 53
If Fault code 54 is stored, reflash the ECU coding file without changing the ECU.

Fig 2: Fault Code 54
If Fault Code 52 is stored, follow the flow diagram on the next page to determine a course of action.

Fig 3: Fault Code 52 Memory Error
If T4 cannot communicate with the ECU follow the troubleshooting procedures on the next page.

Fig 4: Cannot Communicate With ECU