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Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition

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type<br />

EFI-456<br />

<strong>Fault</strong> hxation<br />

Engine control module (ECM) - overheating<br />

Engine coolant blower motor relay, low speed<br />

Engine coolant blower motor relay, high speed<br />

AC condenser blower motor relay<br />

Heated oxygen sensor (H02S) 1 - heater control<br />

Heated oxygen sensor (H02S) 2 - heater control<br />

lgnition coil 1, cylinders 1 & 4<br />

Ignition coil 2, cylinders 2 & 3<br />

Engine control module (ECM) - power stage - group B<br />

Engine control module (ECM) - power stage - group C<br />

Engine control module (ECM) - power stage - group D<br />

Engine control module (ECM) - power stage - group E<br />

Evaporative emission (EVAP) canister purge valve -<br />

sianal<br />

Misfire detected, at least 1 cylinder<br />

Misfire detected - at least 1 cylinder - TWC damage<br />

Cylinder 1, misfire detected - TWC damage<br />

Cylinder 2, misfire detected - TWC damage<br />

Cylinder 3, misfire detected - TWC damage<br />

Cylinder 4, misfire detected - TWC damage<br />

Probable cause<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

lntakelexhaust leaklblockage, MAF sensor,<br />

fuel pressure<br />

Engine coolant blower motor, air supply blocked<br />

Wiring, engine coolant blower motor relay<br />

Wiring, engine coolant blower motor relay<br />

Wiring, AC condenser blower motor relay<br />

Wiring, H02S<br />

Wiring, HO2S<br />

Wiring, ignition coil<br />

Wiring, ignition coil<br />

Wiring, IAC valve, TC wastegate regulating valve,<br />

engine coolant blower motor relay, ECM<br />

Wiring short circuit at terminal B19, ECM<br />

Wiring short to positive, MIL, engine coolant blower<br />

motor relay, fuel pump, ignition coillamplifier,<br />

TCM (load signal), ECM<br />

Wiring short to positive, AC relaylPAlR pump relay,<br />

ECM<br />

Wiring, EVAP canister purge valve<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)<br />

Spark plug, HT lead, distributor rotorlcap, moisture<br />

ingress, injectorlwiring, air leak, compression, head<br />

gasket, low-tension wiring, repeated cold starts<br />

(flooding)

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