Chrysler 1998 Voyager Service Manual page 344

8E - 8 INSTRUMENT PANEL AND SYSTEMS
DIAGNOSIS AND TESTING (Continued)
CONDITION
ERRATIC POINTER
MOVEMENT.
TACHOMETER
INACCURATE.
POSSIBLE CAUSES
1. Bad CCD Bus
Message from Engine
Controller.
2. Internal Cluster Failure.
1. Tachometer out of
calibration.
CORRECTION
1. Check the PCM using a scan tool. Refer to the PCM
section of the manual to properly diagnose and repair.
2. (a) Perform Cluster Self Diagnostic Test and check
for fault codes.
• If the pointer moves during test but still appears
erratic and fault codes 110 or 111 don't appear in the
odometer display, go to Step (b).
• If fault code 110 is displayed in the odometer, go to
Step (e).
• If fault code 111 appears in the odometer display go
to Step (d).
• If fault codes 920 or 940 are displayed in the
odometer display refer to the fault code chart to identify
which module is causing the fault and repair module.
(b) Replace cluster subdial assembly. Go to Step (c).
(c) Connect cluster into instrument panel wiring
harness. Place it back into the proper position in the
instrument panel. Put in the top two mounting screws to
hold the cluster in place DO NOT COMPLETELY
INSTALL CLUSTER TO INSTRUMENT PANEL UNTIL
UNIT IS CALIBRATED AND TESTED. Go to Step (d).
(d) Use a scan tool to calibrate cluster and perform Self
Diagnostic Test. If OK, continue installation. If not OK,
go to Step (e).
(e) Replace main cluster pc board and use a scan tool
to calibrate cluster. If not OK, look at another possible
cause for the tachometer failure.
1. Calibrate tachometer using a scan tool.
NS