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Component Description
NHEC0286
IGNITION COIL & POWER TRANSISTOR
NHEC0286S01
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
on and off the ignition coil primary circuit. This on-off operation induces the proper high voltage in the coil
secondary circuit.
SEF274X
On Board Diagnosis Logic
NHEC0288
Malfunction is detected when the ignition signal in the primary cir-
cuit is not sent to ECM during engine cranking or running.
Possible Cause
NHEC0572
I Harness or connectors (The ignition primary circuit is open or
shorted.)
I Power transistor unit built into ignition coil
I Condenser
I Crankshaft position sensor (REF)
I Crankshaft position sensor (REF) circuit
SEF058Y
DTC Confirmation Procedure
NHEC0289
NOTE:
I If “DTC Confirmation Procedure” has been previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
I If DTC P1320 is displayed with DTC P0335, P0340, P1335
or P1336, perform trouble diagnosis for DTC P0335,
P0340, P1335 or P1336 first. Refer to EC-343, EC-351,
EC-517 or EC-523.
DTC P1320 IGNITION SIGNAL
Component Description
EC-506
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