Mazda B-Series 1997 Workshop Manual page 734

ELECTRONIC SHIFT TRANSFER CASE
Diagnostic trouble
4x4 low (4x4L) range circuit malfunction
code No. PI 729, PI 781
-
- - - - -
-
- -
- -
-
- - -
-
Symptom
DTC 1729 ind~cates 4x4L sw~tch fa~lure open or shorted
DTC 1781 indicates 4x4L sw~tch position closed dur~ng KOEO
- 7 - -
STEP INSPECTION
,
--
----------------
ACTION
- -
Do GEM or PCM connectors or mating pins
Yes Repatr as needed
, - - - _ _ _ _ . _ _ - - _ _ _ _ _ - - - -
have a poor connection?
No
,
Go to next step
d--
- - - - -
-
NGS Installed
Perform KOEO qu~ck test
--
--
ction 4x2 or 4x4H ava~lable dur~ng qu~ck
4x2 or 4x4H and rerun quick test
ccess 4x4L and TR PID
NOTE Foot must be on brake and TR
sensor must indicate neutral posttlon before
Cycle 4x4L sw~tch to 4x2
W~ggle small sections of vehicle harness startlng
1 at the transfer case and work towards the GEM
1
Tap vehlcle harness connector at the transfer
'
case
Wiggle sections of the harness between the
/
GEM and the PCM
I
Does the NGS read~ng fluctuate between 4x4L
/
and 4x2 w~th the 4x4 sh~ft control sw~tch In the
(
4 x 4 ~ pos~tton?
+ -
- - - - -
- -
- - -
Key OFF
Disconnect PCM
BOB ~nstalled, leave PCM d~sconnected
Does voltage fluctuate while measurlng read~ngs
I
between test pins 14 and 24 at the BOB wh~le
o Go to next step
cycl~ng the 4x4L switch?
/
NOTE Transmiss~on In neutral, brake
\
applied
(
Key OFF
Disconnect PCM
BOB ~nstalled, leave PCM disconnected
D~sconnect GEM connector
T-223
- - - - - -
Is res~stance less than 5 ohms when measurlng
between test pln 14 at the BOB and the 4x4L pln
(LBIB w~re) at the GEM vehicle harness
connector?
i
Yes to next step
1
~ ~ ~ c ~ ~ ~ c t PCM
BOB installed, leave PCM disconnected
I
GEM d~sconnected
I
Measure resistance between test plns 14 and 24
r -
at the BOB No Service short c~rcult
Measure resrstance between test plns
14
and
71
at the BOB
Is each resistance greater than 10,000 ohms?
1
Key OFF
PCM reconnected
GEM reconnected
Instrument cluster connector C-214 disconnected.
-
,
-
Check resistance between instrument cluster
I printed circuits 12 (018) and 15 (LBIB)
instrument cluster printed circuit
1
Yes
Is there continu~ty?
l - - l _
- - - - - -
- -
-
8
Perform After Repa~r Procedure to ensure customer's concern has been resolved
Refer to troubleshoot~ng gulde
UT
page
J2-33
Refer to 4x4 system d~agnost~cs
a;i'
Section K