Nissan 100NX N14 silhouetteN14

E.C.C. TROUBLE DIAGNOSES (Models with catalyzer) — Electrical Components Inspection (Cont'd)

EF & EC-144flowchart

GA13DS, GA14DS & GA16DS engines (models with catalyzer).

Continued from EF & EC-143

Electrical Components Inspection (Cont'd)

POWER TRANSISTOR

  1. 1
    Disconnect power transistor harness connector.
    Power transistor harness connector with terminals labeled a, b, c at top-left, and an ohmmeter (resistance) symbol shown in a triangle below indicating continuity-check measurement points between terminals. An arrow points from the terminal diagram to the connector on the component.
    SEC189B
  2. 2
    Check power transistor continuity between terminals as shown in the illustration.

Power transistor continuity check

1
⊕ side: ⓐ, ⊖ side: ⓑ — Resistance: ∞ Ω
N.G.
Replace power transistor unit.
O.K.
2
⊕ side: ⓑ, ⊖ side: ⓐ — Resistance: ∞ Ω
N.G.
same as step 1
O.K.
3
⊕ side: ⓑ, ⊖ side: ⓒ — Resistance: Not ∞ or 0Ω
N.G.
same as step 1
O.K.
4
⊕ side: ⓒ, ⊖ side: ⓑ — Resistance: Not ∞ or 0Ω
N.G.
same as step 1
O.K.
5
⊕ side: ⓒ, ⊖ side: ⓐ — Resistance: Not ∞ or 0Ω
N.G.
same as step 1
O.K.
6
⊕ side: ⓒ, ⊖ side: ⓐ — Resistance: Not ∞ or 0Ω
N.G.
same as step 1
O.K.
INSPECTION END

BOOST PRESSURE SENSOR

  1. 1
    Turn ignition switch "ON".
  2. 2
    Start engine.
  3. 3
    Check voltage between ① and ②.
    Boost pressure sensor and vacuum hose connection in the engine bay. Shows a connector with a voltmeter (V) symbol and a vacuum hose labeled, with callouts pointing to measurement points 1 and 2.
    SEF415K

Boost pressure sensor voltage

Vacuum hose connected
VoltageApproximately 1.0V
Vacuum hose disconnected
VoltageApproximately 4.0V
If N.G., replace boost pressure sensor.
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