Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Ignition Coil

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TESTING



Primary Resistance Check

See Figure 1



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Fig. Fig. 1: Checking the primary circuit of an early model ignition coil

Turn the ignition key OFF , then remove the primary and ground wires from the coil. With the ohmmeter set on the X1 range, touch one lead to the primary terminal and the other lead to the ground terminal. The reading should be 1.04-1.27 ohms for 1982-86 models. For 1987-96 models, refer to the Ignition System diagnosis charts in Emission Controls . If the reading is more than specified, replace the ignition coil assembly.

Secondary Resistance Check

See Figure 2



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Fig. Fig. 2: Checking the secondary circuit of an early model ignition coil

Turn the ignition key OFF , then remove the high tension wire (leading to the distributor) and the ground wire from the coil. Using an ohmmeter, set it on the X1000 scale, touch one lead to the ground terminal and the other lead to the center terminal. The resistance should be 7,300-11,000 ohms for 1982-86 vehicles. For 1987-96 models, refer to the Ignition System diagnosis charts in Emission Controls . If the reading is not correct, replace the ignition coil.

On the Pulsar E16 1984-86 (49 states models), Pulsar E16 1987-88 (all models), a power transistor is used with the ignition coil. The ignition signal from the ECU is amplified by the power transistor, which turns the ignition coil primary circuit on and off, inducing the proper high voltage in the secondary circuit. On these models, the ignition coil is a small molded type. Checking the ignition coils on the 1987-88 Pulsar (CA16DE and CA18DE) involves complicated diagnostic procedures. Refer to Ignition System diagnosis charts in Emission Controls .

REMOVAL & INSTALLATION



See Figure 3



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Fig. Fig. 3: Disconnect the air hose and remove the ornament cover to access the ignition coils-CA16DE and CA18DE engines

On all models, with the exception of the Pulsar CA16DE and CA18DE engines, the coil is either mounted to the wall of the engine compartment or the engine. To remove disconnect and mark all electrical connections then transfer coil mounting bracket if so equipped to the new coil. When installing the new coil make sure that the coil wire and all other electrical connections are properly installed.

On the Pulsar CA16DE and CA18DE engines, a small ignition coil fits directly onto each spark plug. The ECU controls the four coils by means of a crank angle sensor. To remove one (or more) of these coils, disconnect the air duct and the air hoses, then remove the ornament cover. Unfasten the hold-down screws and carefully remove the ignition coil(s) from the spark plug(s).

 
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