Examination
1. In the event of a malfunction in the system, the health check is ultimately limited to swapping with known-good units, but some preliminary checks can be made as described in the following paragraphs.
2. Connect a voltmeter or test lamp between the glow plug supply cable and ground on the engine.
3. Have an assistant activate the preheating system with the ignition key and check that battery voltage is present at the glow plug bus. Note that the voltage will drop to zero when the warm-up period ends.
4. If there is no supply voltage on the glow plug, then the glow plug relay or the supply wiring is faulty.
5. To locate a defective glow plug, first disconnect the negative cable from the battery.
6. Remove the supply wire from the glow plug terminal. Measure the electrical resistance between the glow plug terminal and engine ground. If the resistance is more than a few ohms, then the candle is faulty.
7. If a suitable ammeter is available, connect it between the glow plug and the supply cable and measure the current drawn (ignoring the initial surge). Compare the result with specifications - high current consumption (or no current) indicates a faulty glow plug.
8. At the end of the check, remove the glow plugs and inspect them as described in the following paragraphs.
Withdrawal
9. Disconnect the negative cable from the battery.
10. Remove the nuts and washers from the glow plug terminal and disconnect the cable.
11. Unscrew and remove the glow plug from the cylinder head (see illustration).
12. Inspect the glow plug tip for damage. If the tip is badly burned or charred, it may be due to a faulty fuel injector; see more details. Section FOR.
Installation
13. Install in reverse order; tighten the glow plug with a tightening torque specified specifications (see illustration).
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