Data Displays
When trouble shooting a malfunction, the ECM and BCM data display can be used to compare the vehicle with problems, with a vehicle that is functioning properly. The following is a brief summary of each parameter.
ECM DATA DISPLAY CODES
| Code | Circuit Affected |
|---|---|
| ED01 | Throttle Position Sensor (TPS) |
| ED04 | Coolant Temp. Sensor |
| ED05 | Manifold Air Temperature (MAT) |
| ED06 | Injector Pulse Width |
| ED07 | O2 Sensor Voltage |
| ED08 | Spark Advance |
| ED09 | Torque Conv. Clutch (TCC) |
| ED10 | Battery Voltage |
| ED11 | Engine Speed |
| ED12 | Vehicle Speed |
| ED15 | Operating Mode |
| ED16 | Detonation Control (ESC) |
| ED17 | Knock Sensor |
| ED18 | O2 Sensor |
| ED19 | Fuel Integrator |
| ED20 | Block Learn Multiplier |
| ED21 | Mass Airflow (MAF) |
| ED22 | Idle Air Control (IAC) |
| ED23 | Engine Load |
| ED98 | Ignition Cycle Counter |
| ED99 | ECM PROM I.D. |
BCM DATA DISPLAY CODES
| Code | Circuit Affected |
|---|---|
| BD20 | Commanded Blower Voltage |
| BD21 | Coolant Temperature |
| BD22 | Commanded Air Mix Door Position |
| BD23 | Actual Air Mix Door Position |
| BD24 | Air Delivery Mode |
| 0 | Auto-Recirc/Max A/C |
| 1 | Auto-A/C |
| 3 | Auto-Bi-Level |
| 3 | Auto-Heater/Def |
| 4 | Auto-Heater |
| 5 | Off |
| 6 | Normal Purge |
| 7 | Cold ("DEF") Purge |
| 8 | Forced Defrost |
| 9 | Forced Heater |
| 10 | Forced Bi-Level |
| BD25 | In-Car Temperature |
| BD26 | Actual Outside Temperature |
| BD27 | High Side Temperature |
| BD28 | Low Side Temperature |
| BD32 | Sun Load Temperature Sensor |
| BD40 | Actual Fuel Level |
| BD41 | Gear Selector Position Sensor |
| BD42 | Dimming Pot |
| BD43 | Twilight Delay Pot |
| BD44 | Twilight Photocell |
| BD50 | Battery Voltage |
| BD51 | Generator Field |
| BD60 | Vehicle Speed |
| BD61 | Engine Speed |
| BD70 | Cruise Servo Position |
| BD71 | Oil Pressure Sensor |
| BD98 | Ignition Cycle Counter |
| BD99 | BCM PROM I.D. |