CEL Code P1400
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 1,169
Likes: 178
From: NV
CEL Code P1400
The car is a 2010 ZR1, completely stock. Started the car this morning to take it for a drive and got a CEL. Read the code and it is a P1400 - Cold start emission reduction control system.
Can anyone give me more details as to what exactly the problem is? If I should be concerned and how I can go about fixing it? I've tried posting on the facebook group and haven't received much response at all.
Can anyone give me more details as to what exactly the problem is? If I should be concerned and how I can go about fixing it? I've tried posting on the facebook group and haven't received much response at all.
Safety Car
Joined: Dec 2006
Posts: 4,596
Likes: 1,680
From: Pearland / Houston Tx
See if any of this helps get you started:
Circuit/System Description
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 airflow
• Engine coolant temperature
• Engine runtime
• Park/neutral position
• Vehicle speed
The actual model is then compared to the expected exhaust energy model.
Diagnostic Aids
Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 120 seconds of engine runtime may set this DTC.
Circuit/System Verification
Allow the engine to cool.
Start and idle the engine for at least 2 minutes.
DTC P1400 should run and pass.
Circuit/System Testing
• 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
• Inspect the engine mechanical for items that could alter the air flow into the combustion chamber.
Circuit/System Description
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 airflow
• Engine coolant temperature
• Engine runtime
• Park/neutral position
• Vehicle speed
The actual model is then compared to the expected exhaust energy model.
Diagnostic Aids
Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 120 seconds of engine runtime may set this DTC.
Circuit/System Verification
Allow the engine to cool.
Start and idle the engine for at least 2 minutes.
DTC P1400 should run and pass.
Circuit/System Testing
• 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
• Inspect the engine mechanical for items that could alter the air flow into the combustion chamber.
