Nissan Repair: ZD30, coolant temperature sensor, vehicle speed sensor

Question
I have a ZD30 Nissan with a recurring fault code ( 47 ) and
engine light that stays on......according to the code its a
engine speed sensor which is apparantly either the crank
sensor or injector pump. Both have been replaced and engine
light persists with same fault. The rev counter flicks up
and down during cranking as does the glowlight and engine
check light. What is the cause here please......its driving
me crazy ??

Answer
Gean,

I would look at air pump relay from the code given.  Check out the following list of codes.  Second, if it was the engine speed sensor replace the crank sensor since that is determining the engine revolution.

CODE    FAULT
12    Diagnosis initiated
13    Lambda Sensor (Open circuit)
14 & 15 Coolant temperature sensor (Voltage Low & High
respectively)
16 & 17 Knock Sensor 1&2 respectively. (No voltage charge)
18    Knock control unit (no signal)
19    Crankshaft sensor (incorrect signal)
21 & 22 Throttle position sensor (voltage high & low
respectively)
23    Knock control module
24    Vehicle speed sensor (no signal)
25 - 29 Injector valve 1-5 respectively (voltage high)
31    Crankshaft sensor (no signal)
32    Injector valve 6 (voltage high)
33 & 34 EGR valve (voltage low and high respectively)
35    Idle speed control valve
37    Fault code light (voltage low)
38 & 39 Lambda senor (voltage low and high respectively)
41 & 42 Vehicle speed sensor (voltage low and high respectively)
44 & 45 Lambda sensor (weak and rich mixture respectively)
46 & 47 Air pump relay (voltage high and low respectively)
48 & 49 Battery voltage (low and high respectively)
51    Electronic control unit (hardware failure)
52    Fault code light (voltage high)
53 & 54 Fuel pump relay (voltage low and high respectively)
55    Electronic control unit (hardware failure)
56 & 57 Idle air control (voltage low and high respectively)
59    Inlet manifold valve 1 (voltage high)
61 & 62 Fuel tank vent valve (voltage low and high respectively)
63    Inlet manifold valve 1 (voltage high)
65 & 66 Idle co potentiometer (voltage low and high respectively)
67    Throttle valve switch
68    Idle speed switch (not opening)
69 & 71 Air temperature sensor (voltage low and high
respectively)
72    Throttle valve switch (not opening)
73 & 74 Air flow sensor (voltage low & high respectively)
75    Air transmission torque control (voltage low)
76    Air transmission torque control (Ignition retard long)
79    Traction control (Incorrect ignition/ignition cutoff)
81-86    Injector valve 1 - 6 (voltage low)
87 & 88 Air conditioning cutoff relay (voltage low)
89 & 91 Lambda sensor heater (voltage low and high respectively)
92    Camshaft sensor (incorrect signal)
93 & 94 Hall effect sender (voltage low and high respectively)
97    Traction control (incorrect signal)
98    Lambda sensor (open circuit)
113    Boost control (out of range)
114    Boost pressure idle (above upper limit)
115    Boost pressure full (below upper limit)
116    Boost pressure (above upper limit)
117 & 118 Waste gate valve (voltage low and high respectively)
121    Lambda sensor 2 (weak mixture)
122    Lambda sensor 2 (rich mixture)
123    Inlet manifold 1 (blocked)
124    Inlet manifold 2 (blocked)
132    EGR valve (Incorrect signal)
133 & 134 EGR valve 2 (voltage high and low respectively)
135    Fault code light
136 & 137 Electronic control unit
141    Secondary air pump (not enough air)
142    Secondary air pump (air without pump)
143    Immobiliser function in ECU (no/incorrect signal)
144    No immobiliser signal received
145    Incorrect immobiliser signal received