Preliminary Checks
NOTE:
When diagnosing 1989 vehicles with DRB-II (C-4805), use 1988 cartridge for trouble shooting vehicle. If using a diagnostic readout box other than Chrysler's DRB-II, follow manufacturer's instructions on how to obtain codes. Some other readout boxes may display information that is not contained in this testing. This information may not be relative to diagnosing a problem. Only information in this article should be used during diagnosis.
Most driveability problems in the engine control system result from faulty wiring or leaking hose connections. To avoid unnecessary component testing, a visual check should be performed before beginning trouble shooting procedures to help spot these common faults. A preliminary visual check should include:
- Air ducts to air cleaner and from air cleaner to throttle body.
- Electrical connections at all components. Clean, tight and unbroken.
Check vacuum lines for secure, leak-free connections in these areas:
- Canister purge hose.
- Evaporative control system.
- Fuel pressure regulator vacuum hose.
- MAP sensor.
- PCV valve hose and correct PCV valve.
- Power brake, speed control, heater and A/C system vacuum hoses.
- Throttle body.
- Wastegate control diaphragm and vacuum hoses.
Ensure the following electrical connectors are securely attached:
- 14-pin and 60-pin connectors at Single Module Engine Controller (SMEC).
- A/C clutch relay connector.
- AIS motor connector.
- ASD relay connector.
- Barometric read, wastegate and purge solenoid connector.
- Black distributor reference connector.
- Charge temperature sensor connector.
- Check engine light.
- Coolant temperature sensor connector.
- Detonation sensor connector.
- Distance (speed) sensor connector.
- Distributor pick-up connector.
- Heated O2 sensor connector.
- MAP sensor connector.
- Radiator fan relay connector.
- TPS connector.