Defender 90 (LD) V8-4.0L (1997)
can be resolved by a software change to the PROM of the GEMS ECM.
NOTE:
The repairs outlined in this TIB are to be performed to resolve customer complaint of the symptoms described.
PARTS INFORMATION:
PRM9637 ............. PROM (1996 Discovery-Automatic)
*PRM9630 ............. PROM (1998 Discovery-Manual)*
PRM9643 ............. PROM (1997 Discovery-Automatic, up to VA714541, VA546029)
PRM9644 ............. PROM (1997 Discovery-Manual, up to VA714241, VA546029)
PRM9652 ............. PROM (1997.5-Automatic, from VA714242, VA546O30)
PRM9653 ............. PROM (1997.5-Manual, from VA714242, VA546030)
PRM9642 ............. PROM (D-90)
LRNASTATK ......... Anti-Static Mat
NOTE:
PROM sets will only be released with the approval of the GEMS Helpline.
WARRANTY CLAIMS:
19.22.96
Time: 1.25 hrs.
TestBook access codes, Uniscope analysis, DTCR and Drive Cycle 'C'
19.22.89.29
Time: 0.25 hrs.
Snap Throttle Test
18.30.89.26
Time: 0.50 hrs.
Replace PROM Set
COMP CODE:
7G1A
Normal warranty policy and procedures apply
REPAIR PROCEDURE
1.
Hook up TestBook and follow instructions.
2.
Complete DTCR, recording all freeze-frame data.
3.
Monitor HO2S voltages and heater voltages. If any are out of specification, repair and retest.
4.
Perform the oxygen sensor snap throttle test as outlined in TIB 17/01/96.
5.
If the snap throttle test shows the sensor transition time, both rich to lean and lean to rich, to be good, DO NOT REPLACE THE SENSOR; look at
the service history for other instances of this DTCR.
6.
FAX DTCR to GEMS Helpline to get authorization to replace PROM set.
7.
Reset engine adaptations and IACV to 20-25 steps.