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Autopapyrus · Citroën Jumpy 2.0 HDi DW10 120 hp (2014)
https://autopapyrus.com/guides/citroen/jumpy/glow-plug-diagnosis/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Citroën Jumpy 2.0 HDi DW10 120 hp (2014): Glow Plug Diagnosis

The glow plugs on the DW10 make cold starts easier and keep working for some time after the engine starts. Signs of wear: hard cold starting, white smoke at startup, rough running during the first few minutes, and a flashing or lit preheat lamp and engine fault lamp. The check consists of reading fault codes, measuring the resistance of each plug, and checking power supply and ground.

Difficulty: Medium Time: 1-2 hours (diagnosis), another 1-2 hours to replace the set Steps: 11 Tools: multimeter, OBD-II scanner with PSA support (recommended), extended socket or dedicated glow plug socket, ratchet, torque wrench, penetrating oil, medical syringe or compressed air to blow out the plug wells

Part

  • 🔩 set of 4 glow plugs for the 2.0 HDi DW10 (pencil-type, M8 thread). If the relay or the glow plug control unit is faulty, it is a separate item

Step by step

11 steps
  1. Read the fault codes with a diagnostic scanner. Codes for the glow plug circuit and the glow plug control unit point to either a general fault or a specific cylinder. If the scanner shows no codes, continue with the manual checks. Save the codes and clear them only after the repair.
  2. Check the behavior of the preheat lamp when you switch the ignition on. On a cold engine it should come on for the duration of the preheat and then go out. If the lamp does not come on or it flashes, the control circuit or the relay is faulty. If the lamp behaves normally but the engine is hard to start, the plugs themselves are the more likely culprit.
  3. Check the battery and terminals. Low voltage (below about 12.4 V with no load) causes the same symptoms as weak glow plugs. Charge or replace the battery before continuing the diagnosis.
  4. Remove the decorative engine cover and gain access to the plugs. The plugs are located in the top of the cylinder head, one per cylinder. On some trims an air duct or hoses are in the way, and you will need to disconnect them temporarily. Before that, blow out the wells around the plugs so dirt does not fall into the cylinders.
  5. Disconnect the electrical connector or power bus from each plug. On the DW10 the plugs are usually connected by a common bus or by individual connectors. Work carefully, because the plastic becomes brittle with age. Inspect the contacts for corrosion and signs of overheating.
  6. Measure the resistance of each plug with a multimeter between the plug terminal and the engine ground. A good plug shows low resistance, from a few tenths of an ohm up to 1-2 ohms, and the exact value depends on the manufacturer. Infinite resistance means an open circuit. If a plug differs greatly from the others, it should be replaced. For reliable readings, make sure the probe has a good connection and the ground lead is attached to the engine block.
  7. To test under load, apply 12 V from the battery to the plug through a fuse or ammeter for 10-15 seconds. A good plug draws about 8-15 A, and its tip glows red. Do not hold it longer, or you may burn out the plug. Do this test only on a plug that has been removed. Never apply power directly to a plug installed in the engine.
  8. Check the power supply and ground. If all the plugs are good but the system does not work, check the relay or preheat control unit, the fuses in the engine compartment, and the ground connections. When you switch the ignition on, voltage close to battery voltage should appear at the plug connector. No voltage points to the relay, the control unit, or the wiring.
  9. If replacement is needed, warm up the engine and then let it cool down. Apply penetrating oil and wait 10-15 minutes. Unscrew the plugs slowly with a suitable socket, without any tilting. Plugs in an aluminum head sometimes seize. If there is strong resistance, back the plug out a little, add more oil, and continue. A broken plug should be extracted only by a specialist.
  10. Install the new plugs on clean threads and tighten them with a torque wrench. The torque for M8 glow plugs is low, usually about 8-12 N·m (6-9 lb-ft). Check the exact value against the manufacturer's specification for your plug. Do not overtighten, because the tip breaks easily. Reconnect the connectors and reinstall the air ducts.
  11. Check operation after replacement. Switch the ignition on. The preheat lamp should come on and go out, and the engine should start easily. Read the fault codes again and clear the memory.

Common mistakes and warnings

  • Always do the replacement on a cold engine. The exception is a brief warm-up before removing seized plugs, after which the engine must be allowed to cool. Replace the whole set, because the remaining plugs have the same service life. Never apply power directly to a plug installed in the engine. A plug that breaks off inside the head, or a fragment that falls into the cylinder, requires disassembly and special tools. If in doubt, contact a repair shop.