Power Supplys - Testing
Inadequate power and ground supply can result in
| 1. | No Start |
|---|---|
| 2. | Hard Starting (Long Crank Times) |
| 3. | Inaccurate Diagnostic Status or ECM (Not Found) |
| 4. | Intermittent / Constant "Malfunction Indicator Light" |
| 5. | Intermittent/Constant Driveability Problems |
POWER SUPPLY
Scheme 160
Power supply including fuses should be tested for
| 1. | Visual (1) Blown Fuse |
|---|---|
| 2. | Available Voltage (2) |
| 3. | Voltage Drop (Dynamic Resistance) (2) |
| 4. | Resistance of Cables and Wires (2) |
FUSES SPECIFICATION CHART
The ignition (KL15) must be switched off when removing or installing the ECM connector to prevent voltage spikes (arcing) that can damage the Control Module!
Scheme 161
The Engine Control Module Relay (located in the Electronics Box) should be tested for
| 1. | Battery Voltage and Switched Ground (1) |
|---|---|
| 2. | Resistance (1) |
| 3. | Battery Voltage and Voltage Drop (2) |
ENGINE CONTROL MODULE
