Typical Enabling Conditions

Monitor runs whenever following DTCs are not present

P0031, P0032 (A/F sensor heater - Sensor 1)

P0100 - P0103 (MAF meter)

P0110 - P0113 (IAT sensor)

P0115 - P0118 (ECT sensor)

P0120 - P0223, P2135 (TP sensor)

P0125 (Insufficient ECT for Closed Loop)

P0171, P0172 (Fuel trim)

P0300 - P0304 (Misfire)

P0335 (CKP sensor)

P0340 (cMP sensor)

P0441 - P0456, P2401 - P2420 (EVAP system) P0500 (VSS)

Battery voltage

11 V or more

Engine

Running

ECT

10°C (50°F) or more (Closed loop enabling ECT)

Estimated sensor temperature

450 to 550°C (842 to 1,022°F) (for P2237) 700 to 800°C (1,292 to 1,472°F) (for P2238)

Fuel-cut

Not executed

TYPICAL MALFUNCTION THRESHOLDS

P2237:

A/F sensor admittance

Below 0.002 1/Q

P2238:

One of the following conditions is met

-

1. A/F sensor admittance

Below 0.022 1/Q

2. AF+ terminal voltage

0.5 V or less

3. Difference between AF+ and AF- terminal voltages

P2239:

AF+ terminal voltage

More than 4.5 V

P2252:

AF- terminal voltage

0.5 V or less

P2253:

AF- terminal voltage

More than 4.5 V

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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