Glow Plugs, Checking
Special tools and workshop equipment required
- Multimeter.
- Diode test lamp.
- Wiring diagram.
Test requirements
- Fuse -S39- OK.
- The Glow Plug Relay -J52- OK.
- Battery voltage at least 12.5 volts.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS .
Start diagnosis
-- Disconnect the Engine Coolant Temperature (ECT) Sensor -G62- electrical harness connector -1-.
A "cold engine" condition is simulated when the ECT electrical harness connector is disconnected and the ignition is switched on for the appropriate glow period.
Checking voltage supply
-- Disconnect the Glow Plug -- electrical connectors.
-- Using a Multimeter, check each Glow Plug -- electrical connector, in sequence, from 1 to 4, to Ground (GND) for voltage.
Specified value: Battery voltage for 20 seconds.
If the specified value is not obtained:
-- Check the wiring from the Glow Plug -- electrical harness to the Automatic Glow Time Control Module -J179- pins for an open circuit, short circuit to each other or to Battery (+) or Ground (GND).
| Glow Plug Terminal | Measure to 14-pin connector T14b |
|---|---|
| Q10 | 8 |
| Q11 | 7 |
| Q12 | 6 |
| Q13 | 5 |
Specified value: 1.5 Ω.
If the specified value was not obtained:
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was OK:
Checking Glow Plug
-- Using a Diode test lamp, check the Glow Plug -- from Battery (+) to each individual Glow Plug --.
The Diode test lamp must light up.
If the Diode test lamp does not light up:
-- Replace the faulty Glow Plug --.
-- Perform a road test to verify repair.
If the fault does not return:
Repair complete, Generate readiness code. Refer to READINESS CODE .
-- End diagnosis.
If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK:
-- Recheck the voltage supply.
-- Assembly is performed in the reverse of the removal.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .