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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:
| • | Engine speed |
| • | Spark advance |
| • | Throttle Position |
| • | Engine coolant temperature |
| • | Engine runtime |
| • | Park/neutral position |
| • | Vehicle speed |
The actual model is then compared to the expected exhaust energy model.
| • | The engine is running, and a cold start has been detected. |
| • | Vehicle speed is less than 3 km/h (2 mph). |
| • | The engine is at idle with no input from the accelerator pedal. |
| • | The calculated catalyst temperature is less than 100°C (212°F). |
| • | Engine coolant is greater than 10°C (50°F) and less than 56°C (132°F). |
| • | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set. |
This DTC runs for 12 s within the first 17 s of start-up, or until the calculated catalyst temperature is greater than 900°C (1,652°F). This diagnostic runs once per trip when a cold start has been determined.
The actual exhaust energy model does not match the expected exhaust energy model.
DTC P1400 is a Type A DTC.
DTC P1400 is a Type A DTC.
Engine Control Module Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 17 s of engine run time may set this DTC.
| • | Inspect the air intake system for the following: |
| - | Damage, restriction, or modification |
| - | Dirty or deteriorating air filter element |
| - | Crankcase ventilation system for correct operation--Refer to Crankcase Ventilation System Inspection/Diagnosis . |
| - | Water intrusion |
| - | Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor |
| - | Intake manifold leak |
| • | Inspect the exhaust system for the following: |
| - | Water intrusion |
| - | Exhaust leak |
| - | Damaged, restricted, modified or enhanced exhaust system--Refer to Symptoms - Engine Exhaust . |
| • | Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical . |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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