AG & AJ Bodies
- Remove instrument cluster. See INSTRUMENT CLUSTER R & I
under REMOVAL & INSTALLATION. Check for battery voltage at cavity No. 8 of instrument cluster Red connector. See Fig 1
. Turn ignition on. Check for battery voltage at cavity No. 9 of instrument cluster Red connector. If battery voltage is not present at both locations, repair wiring as necessary.
- If battery voltage is present, check cavity No. 14 of instrument cluster Red connector for continuity to ground. If continuity is not present, repair wiring as necessary. If continuity is present, check for tachometer signal by connecting an AC digital voltmeter to ground and to cavity No. 6 of cluster's Black connector. See Fig 1
.
- A pulsating voltage reading of a minimum of one volt should be present with engine running. If voltage is correct, proceed to step 5). If voltage is less than one volt, check for wire continuity between cavity No. 6 of cluster Black connector and pin No. 43 of engine controller (SBEC) connector. See Figure
and Fig 1
.
NOTE:
Engine controller (SBEC) is located in engine compartment, near the battery, and contains a 60-pin connector. See Figure
.
- If continuity is not present, repair wiring as necessary. Ensure engine controller and its connector do not have damaged pins or poor connections. If continuity is present between cavity No. 6 and pin No. 43, replace engine controller (SBEC) and retest.
- If all tests performed are good and tachometer is still inoperative, replace tachometer drive module. Tachometer drive module is attached to printed circuit board on rear of instrument cluster. If tachometer still remains inoperable, replace tachometer assembly.
Courtesy of CHRYSLER MOTORS.