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Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

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2-1-4 Not applicable NA NA<br />

2-2-1*<br />

2-2-3<br />

2-3-1*<br />

2-3-2*<br />

Fuel trim (lambda<br />

control) too lean at<br />

part load<br />

Signal missing to/<br />

from idle air control<br />

valve<br />

Fuel trim (lambda<br />

control) too lean or<br />

too rich at part load<br />

Fuel trim (lambda<br />

control) too lean or<br />

too rich at idle<br />

Lean; air leak;<br />

low fuel<br />

pressure; bad<br />

AMM<br />

Circuit fault to<br />

IAC or faulty IAC<br />

valve<br />

}If too lean: air<br />

leaks, low fuel<br />

pressure, bad<br />

sensor<br />

}If too rich: high<br />

fuel press.,<br />

leaking injector<br />

Engine stops<br />

when starting<br />

from cold; high<br />

fuel use<br />

Engine difficult to<br />

start; low idle<br />

speed<br />

2-3-3 Not applicable NA NA<br />

2-4-1 Not applicable NA NA<br />

2-4-3 Not applicable NA NA<br />

3-1-1<br />

3-1-2<br />

Signal missing<br />

from speedometer<br />

Signal missing <strong>for</strong><br />

knock-related fuel<br />

enrichment<br />

Speedo wiring or<br />

instrument<br />

cluster wiring<br />

faulty<br />

Wiring break<br />

between EZK<br />

terminal 4 and FI<br />

#28<br />

3-1-4 Not applicable NA NA<br />

3-2-1<br />

Cold-start injector<br />

signal shorted or<br />

missing<br />

Wiring break to<br />

cold-start injector<br />

or fault in injector<br />

}Engine stops<br />

when starting<br />

from cold; high<br />

fuel use or<br />

} various driving<br />

problems<br />

Ignition system RPM<br />

signal missing<br />

sporadically<br />

Same Same<br />

Same Same<br />

Fuel trim (lambda<br />

control) too rich at<br />

part load<br />

Wiring fault or<br />

RPM sensor<br />

Oxygen sensor<br />

Fuel trim (lambda<br />

control) too lean at Oxygen sensor<br />

idle<br />

Idle control outside<br />

Idle speed control<br />

range<br />

EGR system flow too EGR vacuum<br />

low<br />

booster<br />

TPS throttle switch Throttle position<br />

signal absent or faulty switch (TPS)<br />

Idling problems Same Same<br />

No faults evident Same Same<br />

Cold-start<br />

problems<br />

CMP camshaft<br />

sensor signal absent<br />

or faulty<br />

Same Same<br />

Camshaft<br />

position sensor<br />

(CMP)

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