Diagnostics and testing of ignition system 1.8/2.0/1.6 Zetec-E

Common equipment: Worldwide Diagnostic System (WDS).

Inspection and verification

1. Check the customer complaint.

2. Visually inspect for obvious signs of electrical damage.

Visual inspection table

Electrical factors:

• Wiring harness
• Electrical connector(s)
• Spark plug(s)
• Spark plug wire(s)
• Ignition coil unit
• Powertrain Control Module (PCM)

3. If an obvious cause for a reported or received complaint is identified, resolve it (if possible) before proceeding with further action.

4. If the cause is not visually obvious, check the malfunction symptom and refer to the Malfunction Symptom Table.

Table of signs of malfunction

State	Possible Causes	Action
•Misfires	•Spark plug(s) •Spark plug wire(s)	•PERFORM KV check using WDS.
	•Ignition coil unit •PCM. •PCM calibration.	•CONSULT WDS.
•Jerking when the engine is running	•Spark plug(s) •Spark plug wire(s)	•PERFORM KV check using WDS.
	•Ignition coil unit •PCM. •PCM calibration.	•CONSULT WDS.
•Loss of engine power	•Spark plug(s) •Spark plug wire(s)	•PERFORM KV check using WDS.
	•Ignition coil unit	•CONSULT WDS.