Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:
- Ignition Coils
- Ignition Coil Harness
- Powertrain Control Module (PCM)
NOTE:
On all models with distributorless electronic ignition, manufacturer does not recommend checking ignition timing, as faulty readings are common and timing is not adjustable.
Fig 1: Identifying Coil-On-Plug Circuits & Connector Terminals (Aviator, Crown Victoria, Econoline & Expedition 4.6L & 5.4L, Excursion 5.4L, Explorer & Mountaineer 4.6L, Grand Marquis, Mustang 4.6L 2V, Pickup 4.6L & 5.4L, & Town Car)
Fig 2: Identifying Coil-On-Plug Circuits & Connector Terminals (Blackwood, Escape 3.0L, Econoline & Excursion 6.8L, LS, Mustang 4.6L 4V, Navigator, Pickup 6.8L, & Thunderbird)
IGNITION COIL-TO-CYLINDER CORRELATION (COIL-ON-PLUG)
| Application & Cylinder No. | Ignition Coil | Coil Driver | PCM Terminal No. | DTC | |
|---|---|---|---|---|---|
| 3.0L (Escape) | |||||
| 1 | A | A | 26 | P0351 | |
| 4 | D | D | 1 | P0354 | |
| 2 | B | B | 52 | P0352 | |
| 5 | E | E | 27 | P0355 | |
| 3 | C | C | 78 | P0353 | |
| 6 | F | F | 53 | P0356 | |
| 3.0L (LS) | |||||
| 1 | A | A | E31 | P0351 | |
| 4 | D | B | E12 | P0354 | |
| 2 | B | C | E23 | P0352 | |
| 5 | E | D | E22 | P0355 | |
| 3 | C | E | E13 | P0353 | |
| 6 | F | F | E30 | P0356 | |
| 3.9L | |||||
| 1 | A | A | E31 | P0351 | |
| 5 | E | B | E23 | P0355 | |
| 4 | D | C | E13 | P0354 | |
| 2 | B | D | E1 | P0352 | |
| 6 | F | E | E12 | P0356 | |
| 3 | C | F | E22 | P0353 | |
| 7 | G | G | E30 | P0357 | |
| 8 | H | H | E38 | P0358 | |
| 4.6L (104-Pin PCM) & 5.4L | |||||
| 1 | A | A | 26 | P0351 | |
| 3 | C | B | 52 | P0353 | |
| 7 | G | C | 78 | P0357 | |
| 2 | B | D | 104 | P0352 | |
| 6 | F | E | 1 | P0356 | |
| 5 | E | F | 27 | P0355 | |
| 4 | D | G | 53 | P0354 | |
| 8 | H | H | 79 | P0358 | |
| 4.6L (122-Pin PCM) | |||||
| 1 | A | A | E35 | P035 | |
| 3 | C | B | E24 | P0353 | |
| 7 | G | C | E12 | P0357 | |
| 2 | B | D | E1 | P0352 | |
| 6 | F | E | E46 | P0356 | |
| 5 | E | F | E34 | P0355 | |
| 4 | D | G | E23 | P0354 | |
| 8 | H | H | E11 | P0358 | |
| 4.6L (150-Pin PCM) | |||||
| 1 | A | A | E31 | P0351 | |
| 3 | C | B | E23 | P0353 | |
| 7 | G | C | E13 | P0357 | |
| 2 | B | D | E1 | P0352 | |
| 6 | F | E | E12 | P0356 | |
| 5 | E | F | E22 | P0355 | |
| 4 | D | G | E30 | P0354 | |
| 8 | H | H | E38 | P0358 | |
| 6.8L | |||||
| 1 | A | A | 26 | P0351 | |
| 6 | F | B | 1 | P0356 | |
| 5 | E | C | 52 | P0355 | |
| 10 | J | D | 27 | P0360 | |
| 2 | B | E | 78 | P0352 | |
| 7 | G | F | 53 | P0357 | |
| 3 | C | G | 104 | P0353 | |
| 8 | H | H | 79 | P0358 | |
| 4 | D | I | 102 | P0354 | |
| 9 | I | J | 82 | P0359 | |