2010 Cadillac Truck SRX FWD V6-3.0L Page 1491

2010 Cadillac Truck SRX FWD V6-3.0L Page 1491

* The engine is operating in Closed Loop.

* The transmission is not in P/N (automatic transmission only).

This diagnostic attempts one test during each valid idle period once the above conditions have been met. This diagnostic attempts up to 8 tests

during each drive cycle.

LAU

* DTCs P0010, P0011, P0013, P0014, P0030, P0031, P0032, P0036, P0053, P0097, P0098, P0100, P0101, P0102, P0103, P0106, P0107,

P0108, P0117, P0118, P0121, P0122, P0123, P0128, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P013A, P0140, P0141, P0221,

P0222, P0223, P0300, P0335, P0336, P0341, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0458, P0459, P0461, P0496, P0502,

P0506, P0507, P167A, P2088, P2089, P2090, P2091, P2096, P2097, P2176, P2195, P2196, P2232, P2237, P2243, P2251, P2270, P2271,

P2297, P2626 are not set.

* The engine speed is between 1,040-2,760 RPM.

* The engine load is between 15-50 percent.

* The engine is operating in Closed Loop.

* The calculated exhaust mass gas flow is between 5-56 g/sec, and stable.

* The calculated catalyst temperature is between 400-850掳C (852-1,562掳F).

* The intake air temperature (IAT) is greater than -15 (5掳F).

This diagnostic attempts one test during each period when the above conditions have been met. This diagnostic attempts up to 4 tests during each

drive cycle.

Conditions for Setting the DTC

The ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold.

Action Taken When the DTC Sets

DTC P0420 and P0430 are Type A DTCs.

Conditions for Clearing the DTC

DTC P0420 and P0430 are Type A DTCs.

Diagnostic Aids

Inspect for the following conditions, which may cause a catalytic converter to degrade:

* An engine misfire

* High engine oil or high coolant consumption

* Retarded spark timing

* A weak or poor spark

* A lean fuel mixture

* A rich fuel mixture

* A damaged oxygen sensor or wiring harness

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Testing

1. Engine idling, observe the DTC information with a scan tool. Verify there are no HO2S or misfire DTCs set.

瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) to diagnosis the applicable DTC, before proceeding with this diagnostic

procedure.

2. Verify the following conditions do not exist with the catalytic converter:

* Dents

* A severe discoloration caused by excessive temperatures

* Road damage

* An internal rattle caused by damaged catalyst substrate