The instrument panel cluster (IPC) displays the engine speed based on the information from the powertrain control module (PCM) (4.2L) or engine control module (ECM) (5.3L). The PCM/ECM converts the data for engine speed to a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit from the PCM/ECM in order to calculate the engine speed.
Instrument Panel, Gages, and Console Connector End Views
Instrument Cluster Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Ignition ON, using the scan tool, perform the IPC Gauges output control test. All gauges should sweep from their minimum position to their maximum position and return.
⇒ | If any of the gauges do not sweep, replace the IPC. |
⇒ | If the scan tool displayed engine speed are not equal, test for an open/high resistance or short to ground on the engine speed signal circuit. If the circuit tests normal, replace the PCM/ECM. |
Control Module References for ECM/PCM and IPC replacement, setup and programming.