Diagnostic Aids
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:
- Ignition Coil Pack(s)
- Ignition Coil Wiring Harness
- IGN START/RUN Circuit To Coil Pack(s)
- Powertrain Control Module (PCM)
NOTE:
Electronic ignition engine timing is entirely controlled by PCM. Electronic ignition timing is not adjustable. DO NOT attempt to check base timing. You will receive false readings.
Fig 1: Identifying 4-Tower Coil Pack Wiring Harness Connector Terminals (Cougar 2.0L, Escape 2.0L, Escort & Focus, & Ranger 2.3L)
Fig 2: Identifying Horizontal 6-Tower Coil Pack Wiring Harness Connector Terminals (Explorer Sport & Explorer Sport Trac, Explorer & Mountaineer 4.0L SOHC With 104-Pin PCM, & Ranger 4.0L)
Fig 3: Identifying Horizontal 6-Tower Coil Pack Wiring Harness Connector Terminals (Explorer & Mountaineer 4.0L SOHC With 150-Pin PCM)
Fig 4: Identifying Series 5 Coil Pack Wiring Harness Connector Terminals (Cougar 2.5L, Econoline 4.2L, Mustang 3.8L, Pickup 4.2L, Ranger 3.0L, Sable & Taurus 3.0L 2V, & Windstar)
NOTE:
Performing step 1) and comparing test results to IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK) table can help determine which coil is not firing.
IGNITION COIL-TO-CYLINDER CORRELATION (COIL PACK)
| Application & Cylinder No. | Coil Driver | PCM Terminal No. | DTC | |
|---|---|---|---|---|
| 4-Cylinder | ||||
| 1 | A | 26 | P0351 | |
| 3 | B | 52 | P0352 | |
| 4 | A | 26 | P0351 | |
| 2 | B | 52 | P0352 | |
| V6 (104-Pin PCM 4.0L SOHC) | ||||
| 1 | A | 26 | P0351 | |
| 4 | B | 52 | P0352 | |
| 2 | C | 78 | P0353 | |
| 5 | A | 26 | P0351 | |
| 3 | B | 52 | P0352 | |
| 6 | C | 78 | P0353 | |
| V6 (150-Pin PCM 4.0L SOHC) | ||||
| 1 | A | C31 | P0351 | |
| 4 | B | C23 | P0352 | |
| 2 | C | C13 | P0353 | |
| 5 | A | C31 | P0351 | |
| 3 | B | C23 | P0352 | |
| 6 | C | C13 | P0353 | |