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

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EOBD trouble code table I<br />

lrouble<br />

code<br />

PO490<br />

PO491<br />

I<br />

<strong>Fault</strong> location<br />

Exhaust gas recirculation (EGR) system - circuit high<br />

Secondary air injection (AIR) system, bank 1 -<br />

malfunction<br />

Secondary air injection (AIR) system, bank 2 - Wiring, AIR solenoid, hose connections, mechanical<br />

1 malfunction 1 fault<br />

PO493 1 Engine coolant blower motor over-speed (clutch locked) I Blower motor clutch, mechanical fault<br />

PO494 1 Engine coolant blower motor speed - low I Wiring, relay, blower motor, mechanical fault<br />

PO495 1 Engine coolant blower motor speed - high<br />

PO496 1 Evaporative emission (EVAP) system - high purge flow<br />

PO497<br />

PO498<br />

PO499<br />

PO500<br />

PO501<br />

PO502<br />

PO503<br />

PO504<br />

PO505<br />

PO506<br />

PO508<br />

PO509<br />

PO510<br />

PO51 1<br />

PO512<br />

PO51 3<br />

PO514<br />

PO51 5<br />

PO516<br />

PO517<br />

PO518<br />

PO519<br />

PO520<br />

PO521<br />

PO522<br />

PO523<br />

Evaporative emission (EVAP) system - low purge flow<br />

Evaporative emission (EVAP) system, vent control -<br />

circuit low<br />

Evaporative emission (EVAP) system, vent control -<br />

circuit high<br />

I<br />

Vehicle speed sensor (VSS) - circuit malfunction<br />

Vehicle speed sensor (VSS) - rangelperformance<br />

problem<br />

Vehicle speed sensor (VSS) - low input<br />

Vehicle speed sensor (VSS) - intermittentlerraticlhigh<br />

input<br />

Brake switch - A/B correlation<br />

Idle speed control (ISC) system - malfunction<br />

Idle speed control (ISC) system - rpm lower than<br />

expected<br />

ldle speed control (ISC) system - rpm higher than<br />

expected<br />

Idle air control (IAC) - circuit low<br />

Idle air control (IAC)- circuit high<br />

Closed throttle position (CTP) switch - circuit malfunction<br />

Idle air control (IAC) - circuit malfunction<br />

Starter request circuit - malfunction<br />

Incorrect immobilizer key<br />

Battery temperature sensor - clrcuit rangelperformance<br />

Battery temperature sensor - circuit malfunction<br />

Battery temperature sensor - circuit low<br />

Battery temperature sensor - circuit high<br />

Idle air control (IAC) - circuit intermittent<br />

Idle air control (IAC) - circuit performance<br />

Engine oil pressure sensor/switch - circuit malfunction<br />

Engine oil pressure sensorlswitch - rangelperformance<br />

problem<br />

Engine oil pressure sensor/switch - low voltage<br />

Engme oil pressure sensor/switch - high voltage<br />

I<br />

Probable cause<br />

Wiring short to positive, EGR valve<br />

Wiring, AIR solenoid, hose connections, mechanical<br />

fault<br />

Wiring, relay, blower motor, mechanical fault<br />

Wiring, EVAP valve, mechanical fault<br />

Wiring, EVAP valve, hoses blocked, mechanical fault<br />

Wiring short to earth, EVAP valve<br />

Wiring short to positive, EVAP valve<br />

Wiring, VSS, ECM<br />

Wiring, speedometer, VSS, CAN data bus<br />

Wiring short to earth, VSS, ECM<br />

PO524 1 Engine oil pressure too low I Mechanical fault<br />

Wiring, poor connection, other connected system,<br />

instrument panel, VSS<br />

Wiring, mechanical fault<br />

Wiring, ISC actuator1lAC valve, throttle motor, throttle<br />

valve tightlsticking, ECM<br />

Wiring, ISC actuator1lAC valve, throttle motor, throttle<br />

valve tiphtlstickinp, ECM<br />

Wiring, ISC actuator1lAC valve, throttle motor, throttle<br />

valve tiahtlstickina. ECM<br />

Wiring short to earth, IAC valve, ECM<br />

Wiring short to positive, IAC valve, ECM<br />

Wiring, CTP switch, ECM<br />

Wiring, poor connection, IAC valve, ECM<br />

Wiring, immobilizer system, relay<br />

Immobilizer system<br />

Wiring, poor connection, battery temperature sensor<br />

Wiring, poor connection, battery temperature sensor<br />

Wiring short to earth, battery temperature sensor,<br />

ECM<br />

Wiring short to positive, battery temperature sensor,<br />

ECM<br />

Wiring, poor connection, IAC valve, ECM<br />

Wiring, poor connection, IAC valve, ECM<br />

Wiring, engine oil pressure sensorlswitch, ECM<br />

Engine oil pressure sensorlswitch<br />

Wiring short to earth, engine oil pressure<br />

sensorlswitch, ECM<br />

Wiring short to positive, engine oil pressure sensor1<br />

switch, ECM

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