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Glow Plug Control Unit
- To test pre-glow operation, connect test lamp to Blue wire of control unit (harness connector plugged in). Turn ignition on and measure amount of time test lamp is lighted. See Pre-Glow Test Specifications table.
PRE-GLOW TEST SPECIFICATIONS
| Coolant Temp. °F (°C) |
Time in Seconds |
Terminal Voltage |
| Below 122 (50) |
12 |
8 |
| Below 122 (50) |
6 |
10.5 |
| Above 122 (50) |
0 |
0 |
- Connect test lamp to Black/White wire of control unit. Measure amount of time that test lamp is lighted when ignition switch is turned from "START" to "ON". See After-Glow Test Specifications table. Test lamp will be on continuously with switch in "START" position.
AFTER-GLOW TEST SPECIFICATIONS
| Coolant Temperature °F (°C) |
Time in Seconds |
| Below -13 (-25) |
31 |
| 68 (20) |
11 |
| 104 (40) |
5 |
| 122 (50) |
0 |
- Test lamp will turn off during after-glow operation when glow plug voltage reaches 7 volts. Replace glow plug control unit if defective.