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

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EOBD trouble code table<br />

<strong>Trouble</strong><br />

code<br />

PO1 20<br />

PO121<br />

PO131<br />

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

Engine coolant temperature (ECT) sensor -<br />

circuit intermittent<br />

I<br />

Throttle position (TP) sensor Akxcelerator pedal position<br />

(APP) . , sensor A - circuit malfunction<br />

Throttle msition (TP) switch Naccelerator pedal msition<br />

I IAPP) switch A -circuit malfunction<br />

. ,<br />

I Throttle position (TP) sensor Naccelerator pedal position<br />

(APP) sensor A - rangelperformance problem<br />

Throttle position (TP) switch Nacceferator pedal position<br />

(APP) switch A - rangelperformance problem<br />

I<br />

I<br />

Probable cause<br />

Wiring, poor connection, ECT sensor, ECM<br />

Wiring, TPIAPP sensor, ECM<br />

Wiring, TPIAPP switch, ECM<br />

Accelerator cable adjustment, TPIAPP sensor<br />

Accelerator cable adjustment, TPIAPP switch<br />

Throttle position (TP) sensor Naccelerator pedal position Wiring short to earth, TPIAPP sensor, ECM<br />

(APP) sensor A - low input<br />

Throttle position (TP) switch Naccelerator pedal position Wiring short to earth, TPIAPP switch, ECM<br />

(APP) switch A - low input<br />

Throttle position (TP) sensor Naccelerator pedal position<br />

(APP) sensor A - high input<br />

Throttle position (TP) switch Naccelerator pedal position<br />

(APP) switch A - high input<br />

Wiring short to positive, TP/APP sensor, ECM<br />

Wiring short to positive, TPIAPP switch, ECM<br />

Throttle position (TP) sensor Naccelerator pedal position Wiring, poor connection, TPIAPP sensor, ECM<br />

(APP) sensor A - circuit intermittent<br />

Throttle position (TP) switch Naccelerator pedal position Wiring, poor connection, TPIAPP switch, ECM<br />

(APP) switch A - circuit intermittent<br />

Insufficient coolant temperature for closed loop fuet control Wiring, cooling system, coolant thermostat,<br />

I ECT sensor<br />

Insufficient coolant temperature for stable operation Wiring, cooling system, coolant thermostat,<br />

ECT sensor<br />

Intake air temperature too high<br />

Wiring short to earth, IAT sensor 2, mechanical fault,<br />

ECM<br />

Coolant thermostat - coolant temperature below Mechanical fault<br />

thermostat regulating temperature<br />

Barometric pressure too low<br />

Wiring, BAR0 sensor, mechanical fault<br />

Heated oxygen sensor (H02S) 1, bank 1 - circuit<br />

malfunction<br />

Oxygen sensor (02s) 1, bank 1 - circuit malfunction<br />

Heated oxygen sensor (H02S) 1, bank 1 - low voltage<br />

Oxygen sensor (02s) 1, bank 1 - low voltage<br />

Heating inoperative, poor connection, wiring, H02S<br />

Wiring, 02S, ECM<br />

PO132 I Heated oxygen sensor (H02S) 1, bank 1 - high voltage I Wiring short to positive, H02S, ECM<br />

PO133<br />

PO135<br />

PO137<br />

PO138<br />

Oxygen sensor (02s) 1, bank 1 - high voltage<br />

Heated oxygen sensor (H02S) 1, bank 1 -slow response<br />

Oxygen sensor (02s) 1, bank 1 - slow response<br />

Heated oxygen sensor (H02S) 1, bank 1 - no activity<br />

detected<br />

Oxygen sensor (02s) 1, bank 1 - no activity detected<br />

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

circuit malfunction<br />

Heated oxygen sensor (H02S) 2, bank 1 -<br />

circuit malfunction<br />

Oxygen sensor (02s) 2, bank 1 - circuit malfunction<br />

Heated oxygen sensor (H02S) 2, bank 1 - low voltage<br />

Oxygen sensor (02s) 2, bank 1 - low voltage<br />

Heated oxygen sensor (H02S) 2, bank 1 - high voltage<br />

Oxygen sensor (02s) 2, bank 1 - high voltage<br />

Exhaust leak, wiring short to earth, H02S, ECM<br />

Exhaust leak, wiring short to earth, 02S, ECM<br />

Wiring short to positive, 02S, ECM<br />

Heating inoperative, wiring, H02S<br />

Wiring, 02s<br />

Wiring open circuit, heating inoperative, H02S<br />

Wiring, 02s<br />

Fuse, wiring, H02S, ECM<br />

Heating inoperative, wiring, H02S, ECM<br />

Wiring, 02S, ECM<br />

Exhaust leak, wiring short to earth, H02S, ECM<br />

Exhaust leak, wiring short to earth, 02S, ECM<br />

Wiring short to positive, H02S, ECM<br />

Wiring short to positive, 02S, ECM

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