Pick-Up Coil Test

Fig. 13 Checking pick-up coil resistance. Models w/external coil:

Fig. 14 Checking pick-up coil resistance. Models w/internal coil:

Fig. 15 Pick-up coil connector terminal identification.:

Fig. 16 Pick-up coil connector terminal identification.:

Fig. 17 Pick-up coil connector terminal identification.:

Fig. 18 Checking pick-up coil air gap (Typical):

These ignition systems may use up to three pick-up coils.
1. On models with external coil, disconnect electrical connector(s) to distributor. On models with internal coil, remove distributor cap, rotor and dust shield, if equipped.
2. On all except 3S-FE, 3S-GE, 5M-GE and 7M-GE engines, measure resistance between pick-up coil terminals as shown in Figs. 13 and 14. On 4A-GE, 4A-GEL, 4A-GEC and 4A-GELC engines, two pick-up coil connectors are used. Measure resistance between the two sets of pick-up terminals separately.
3. On 5M-GE engines, measure resistance between white and yellow wire terminals and between white and red wire terminals in distributor connector, Fig. 15.
4. On 3S-GE and 7M-GE engines, measure resistance between terminals G1 and G- , G2 and G- and Ne and G- , Fig. 16.
5. On 3S-FE engines, measure resistance between G and G- terminals, then the Ne and G- terminals, Fig. 17.
6. Pickup coil resistances should be 130-190 ohms on 3A-C engines, or 140-180 ohms on all other engines.
7. If resistance is not within specifications, pick-up coil, distributor housing or distributor should be replaced.
8. Rotate crankshaft as necessary to align one tooth or reluctor with pick-up pole piece(s), Fig. 18, and ensure that air gap is .008-.016 inch. Use non-magnetic feeler gauge when checking air gap. Engines may use one, two or three pick-up coils. Check air gap for all coils as outlined.
9. If pick-up coil air gap is incorrect, adjust as necessary. On some models, pick-up coils are not adjustable. If air gap is incorrect, the distributor or distributor housing must be replaced.