Diagnostic Test Mode
- Connect diagnostic read-out box to connector at left shock tower and move read/hold switch to "READ" position. See Figure .
- Ensure that carburetor switch is open by placing fast idle screw on highest step. Turn ignition switch to run position. Wait for code "00" to appear on read-out box.
- Move hold/read switch to "HOLD" position and record any codes that are displayed. Read-out may be stopped at any time by moving switch to "READ" position, then back to "HOLD" position when ready to continue read-out.
- Before using indicated trouble code charts, perform a careful visual check of all wiring and vacuum connections in the indicated system (many problems are the result of loose, disconnected, or misconnected wires or vacuum hoses). If these components are in good condition and properly connected, use respective charts to complete diagnosis of system fault. See EFC FAULT CODE IDENTIFICATION table to interpret stored codes.
EFC FAULT CODE IDENTIFICATION
| Code | Circuit/System Affected |
|---|---|
| 00 | Read-out box receiving power |
| 11 | O2 Solenoid Circuit |
| 13 | V.O.S. Solenoid Circuit |
| 14 | Stored when battery has been disconnected |
| 17 | Electronic Throttle Control Solenoid |
| 18 | Canister Purge Solenoid |
| 21 | Distributor Pick-Up Coil Circuit |
| 22 | O2 Feedback Circuit |
| 24 | Spark Control Computer (SCC) |
| 25 | Radiator Fan Coolant Sensor |
| 26 | Engine Temperature Sensor |
| 28 | Speed Sensor |
| 31 | Stored when engine has not cranked since battery last disconnected |
| 32 & 33 | Spark Control Computer (SCC) |
| 55 | Indicates end of message |
| 88 | First code displayed. Indicates start of message |