Power Transistor (Maxima Only, All Others Refer To Engine Performance, G-Test W/Codes, Code 21).
WARNING: This page is about a different car, the 1989 Nissan Pickup, 1989 Nissan Pathfinder, 1989 Nissan Maxima, and 1989 Nissan 300ZX. However, it is still accessible from the selected car via links, so may be relevant.
The ignition signal from the E.C.U. 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.
Disconnect power transistor harness connector. Check the continuity between the Power Transistor terminals, refer to the POWER TRANSISTOR CONTINUITY TABLE for test information.
POWER TRANSISTOR CONTINUITY (1)
| Terminal No. (2) | Tester Polarity | Continuity | ||||
|---|---|---|---|---|---|---|
| *a | POS. | N/A | ||||
| *b | NEG. | YES | ||||
| *a | NEG. | N/A | ||||
| *b | POS. | NO | ||||
| *a | POS. | N/A | ||||
| *c | NEG. | YES | ||||
| *a | NEG. | N/A | ||||
| *c | POS. | NO | ||||
|
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If N.G., replace Power Transistor.