ECM/ABS ECU - DTC's P1317/P1703 Set
12/31/9619/11/96/US
SUBJECT:
PRIDE - GEMs Codes P1317 & P1703
MODEL:
Range Rover 4.0/4.6
AFFECTED VEHICLES:
LP up to TA327537
LH
LJ
LD
DETAIL
If one of the above DTC's appears alone, the technician should inspect the wiring and connectors in the affected circuit. A P1317 code will require a check of the circuit between the GEMS ECM and the ABS ECU. A P1703 code will require a check between the GEMS ECM and the transfer box ECU.
If the faults occur together it is likely that the operator of the vehicle cycled the ignition key (power up/power down) in a way that is known to cause a communications "glitch" between the GEMS ECM and the ABS/T box ECU. If this occurred, DTC's P1317 and P1703 would be stored in GEMS and the MIL would illuminate.
The diagnostic steps and repair procedures detailed in this bulletin were developed as an element of the Land Rover Way OPERATION PRIDE. This TIB provides a library location for PRIDE information within the Land Rover North America technical literature system.
ACTION REQUIRED
If during TestBook diagnosis codes P1317 and P1703 are retrieved obtain Prom set PRM9622 and update the ECM Proms as described below. A software modification prevents the problem from occurring.
PARTS INFORMATION
PRM9622 - Prom Set
LRNASTATK - Anti-static Mat Kit
PROCEDURE
NOTE:
Check that PRM9622 is not already fitted by accessing the "vehicle type" icon on the GEMS diagnostic in TestBook. This can be found in Real Time monitoring under the switches & status icon. The tune I.D. number indicates the PROM currently fitted.
After checking the tune I.D. number, perform the diagnostic procedures and repairs outlined below for the resolution of GEMS Code P1317 & P1703.
PREPARATION
1. Record the fault on a DTCR, complete with freeze frame and FAX to LRNA at (301) 731-9814.
2. If one of the DTC's appear alone, inspect the wiring and connectors in the affected circuit.
^ P1317 code - check circuit between the GEMS ECM and the ABS ECU.
^ P1703 code - check between the GEMS ECM and the transfer box ECU.
3. If the faults occur together obtain PROM set PRM9622 and update the ECM PROMs as described below.
REMOVAL
1. Make sure the ignition key is turned off.
2. Remove battery cover, ECM cover and harness clamp.
3. Disconnect harnesses and remove ECM.
NOTE:
Verify that white anti-back out strips are in place in connectors. If missing, install new ones.
4. Place ECM on grounded anti-static mat (LRNASTATK), red connector side up. Be sure to wear grounding wrist band (figure 1).
5. Remove 5 Torx(R) (T20) from cover and remove.
6. Remove 8 Torx(R) screws holding circuit board and fold over onto mat exposing chips.
NOTE:
Circuit board is easily damaged. DO NOT use screwdrivers or the like to pry covers off.
7. Using suitable pliers carefully remove the blue and green chip covers (figure 2).
8. Remove the exposed Proms with Prom puller.
INSTALLATION
NOTE:
One PROM has 28 pins and the other 32 pins.
1. Make sure that the PROMs are oriented with the cutout towards the red connector and cutouts on the chip sockets.
2. Take care not to damage PROM legs. Carefully install new PROMs.
3. Check for bent pins before replacing PROM covers.
Do not overtighten circuit board screws
4. Install circuit board and fasten with screws removed earlier. Torque to 2.25-2.82 Nm. (20-25 lb. in.).
5. Replace outer cover and fasten with screws.
6. Apply the supplied self-adhesive update label on the side of the ECM to signify that update has been done.
7. Install ECM in box and reconnect wire harnesses.
NOTE:
Ensure that harness grommet is properly placed in ECM box.
8. Install ECM, harness clamp and battery covers.
9. Start vehicle and road test to assure proper engine operation and engine management system adaptation.
WARRANTY:
Normal warranty policy and procedures apply
COMP.CODE
SRO
19.22.98 - Time 0.80 hr.
TestBook hook up, access codes, DTCR and diagnostic drive
18.30.89.26 Time 0.50
Replace Prom set
19.22.13.17 Time 0.05 hr
Gems P Code P1317
19.22.17.03 Time 0.05 hr
Gems P Code P1703