Chrysler RAM TRUCK 2500 1994 Service Manual page 409

8E - 12 i i S T i U i E i T PANEL AND IAUIES •
Fig. 17 Voltmeter Terminals
(3) Check for continuity between speedometer
speed sensor input terminal (Fig. 18) and ground.
There should be no continuity. I f OK, continue to
next step. I f not OK, repair short i n circuit from ve­
hicle speed sensor.
(4) With ignition switch i n ON position, check for
battery voltage across speedometer B+ terminal and
ground terminal (Fig. 18). I f OK, replace speedome­
ter/odometer. I f not OK, continue to next step.
(5) Unplug cluster connector B (black). With igni­
tion switch i n ON position, check for battery voltage
at cavity #8. I f OK, continue to next step. I f not OK,
repair circuit to fuse #12.
(6) Turn ignition switch to OFF and unplug cluster
connector A (white). Check for continuity to ground
at cavity #6. I f OK, replace cluster printed circuit
board. I f not OK, repair open circuit to ground.
VEHICLE SPEED SENSOR
For testing of the vehicle speed sensor and related
components, refer to the Powertrain Diagnostic Test
Procedures manual.
TACHOMETER
When a problem occurs with the tachometer opera­
tion, before disassembling the cluster to check the
gauge, check for a good tach signal from the power-
train control module (PCM). Refer to the Powertrain
Diagnostic Test Procedures manual for the appropri­
ate tests.
(1) Pull instrument cluster from dash. Do not un­
plug cluster connectors. Refer to Instrument Cluster
Replacement for removal procedures.
(2) Check continuity between PCM connector cav­
ity 43 and tachometer input terminal (Fig. 19). There
should be continuity. I f OK, continue to next step. I f
not OK, repair open circuit as required.
(3) Check continuity between tachometer input ter­
minal (Fig. 19) and ground. There should be no con-
J948E-32
Fig. 18 Speedometer Terminals
tinuity. I f OK, continue to next step. I f not OK,
repair short i n circuit from PCM.
(4) With ignition switch i n ON position, check for
battery voltage across tachometer B+ terminal and
ground terminal (Fig. 19). I f OK, replace tachometer.
I f not OK, continue with next step.
(5) Unplug cluster connector B (black). With igni­
tion switch i n ON position, check for battery voltage
at cavity #8. I f OK, continue to next step. I f not OK,
repair circuit to fuse #12.
(6) Turn ignition switch to OFF and unplug cluster
connector A (white). Check for continuity to ground
at cavity #6. I f OK, replace cluster printed circuit
board. I f not OK, repair open circuit to ground.
Fig. 19 Tachometer Terminals